<!--- app-name: Memcached -->

# Bitnami package for Memcached

Memcached is an high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

[Overview of Memcached](http://memcached.org)

Trademarks: This software listing is packaged by Bitnami. The respective trademarks mentioned in the offering are owned by the respective companies, and use of them does not imply any affiliation or endorsement.

## TL;DR

```console
helm install my-release oci://registry-1.docker.io/bitnamicharts/memcached
```

Looking to use Memcached in production? Try [VMware Tanzu Application Catalog](https://bitnami.com/enterprise), the commercial edition of the Bitnami catalog.

## Introduction

This chart bootstraps a [Memcached](https://github.com/bitnami/containers/tree/main/bitnami/memcached) deployment on a [Kubernetes](https://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.

Bitnami charts can be used with [Kubeapps](https://kubeapps.dev/) for deployment and management of Helm Charts in clusters.

## Prerequisites

- Kubernetes 1.23+
- Helm 3.8.0+

## Installing the Chart

To install the chart with the release name `my-release`:

```console
helm install my-release oci://REGISTRY_NAME/REPOSITORY_NAME/memcached
```

> Note: You need to substitute the placeholders `REGISTRY_NAME` and `REPOSITORY_NAME` with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use `REGISTRY_NAME=registry-1.docker.io` and `REPOSITORY_NAME=bitnamicharts`.

These commands deploy Memcached on the Kubernetes cluster in the default configuration. The [Parameters](#parameters) section lists the parameters that can be configured during installation.

> **Tip**: List all releases using `helm list`

## Configuration and installation details

### Resource requests and limits

Bitnami charts allow setting resource requests and limits for all containers inside the chart deployment. These are inside the `resources` value (check parameter table). Setting requests is essential for production workloads and these should be adapted to your specific use case.

To make this process easier, the chart contains the `resourcesPreset` values, which automatically sets the `resources` section according to different presets. Check these presets in [the bitnami/common chart](https://github.com/bitnami/charts/blob/main/bitnami/common/templates/_resources.tpl#L15). However, in production workloads using `resourcesPreset` is discouraged as it may not fully adapt to your specific needs. Find more information on container resource management in the [official Kubernetes documentation](https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/).

### Prometheus metrics

This chart can be integrated with Prometheus by setting `metrics.enabled` to `true`. This will deploy a sidecar container with [memcached_exporter](https://github.com/prometheus/memcached_exporter) in all pods and a `metrics` service, which can be configured under the `metrics.service` section. This `metrics` service will have the necessary annotations to be automatically scraped by Prometheus.

#### Prometheus requirements

It is necessary to have a working installation of Prometheus or Prometheus Operator for the integration to work. Install the [Bitnami Prometheus helm chart](https://github.com/bitnami/charts/tree/main/bitnami/prometheus) or the [Bitnami Kube Prometheus helm chart](https://github.com/bitnami/charts/tree/main/bitnami/kube-prometheus) to easily have a working Prometheus in your cluster.

#### Integration with Prometheus Operator

The chart can deploy `ServiceMonitor` objects for integration with Prometheus Operator installations. To do so, set the value `metrics.serviceMonitor.enabled=true`. Ensure that the Prometheus Operator `CustomResourceDefinitions` are installed in the cluster or it will fail with the following error:

```text
no matches for kind "ServiceMonitor" in version "monitoring.coreos.com/v1"
```

Install the [Bitnami Kube Prometheus helm chart](https://github.com/bitnami/charts/tree/main/bitnami/kube-prometheus) for having the necessary CRDs and the Prometheus Operator.

### [Rolling vs Immutable tags](https://techdocs.broadcom.com/us/en/vmware-tanzu/application-catalog/tanzu-application-catalog/services/tac-doc/apps-tutorials-understand-rolling-tags-containers-index.html)

It is strongly recommended to use immutable tags in a production environment. This ensures your deployment does not change automatically if the same tag is updated with a different image.

Bitnami will release a new chart updating its containers if a new version of the main container, significant changes, or critical vulnerabilities exist.

### Update credentials

The Bitnami Memcached chart, when upgrading, reuses the secret previously rendered by the chart or the one specified in `auth.existingPasswordSecret`. To update credentials, use one of the following:

- Run `helm upgrade` specifying a new password in `auth.password`
- Run `helm upgrade` specifying a new secret in `auth.existingPasswordSecret`

### Use Sidecars and Init Containers

If additional containers are needed in the same pod (such as additional metrics or logging exporters), they can be defined using the `sidecars` config parameter.

```yaml
sidecars:
- name: your-image-name
  image: your-image
  imagePullPolicy: Always
  ports:
  - name: portname
    containerPort: 1234
```

If these sidecars export extra ports, extra port definitions can be added using the `service.extraPorts` parameter (where available), as shown in the example below:

```yaml
service:
  extraPorts:
  - name: extraPort
    port: 11311
    targetPort: 11311
```

> NOTE: This Helm chart already includes sidecar containers for the Prometheus exporters (where applicable). These can be activated by adding the `--enable-metrics=true` parameter at deployment time. The `sidecars` parameter should therefore only be used for any extra sidecar containers.

If additional init containers are needed in the same pod, they can be defined using the `initContainers` parameter. Here is an example:

```yaml
initContainers:
  - name: your-image-name
    image: your-image
    imagePullPolicy: Always
    ports:
      - name: portname
        containerPort: 1234
```

Learn more about [sidecar containers](https://kubernetes.io/docs/concepts/workloads/pods/) and [init containers](https://kubernetes.io/docs/concepts/workloads/pods/init-containers/).

### Set Pod affinity

This chart allows you to set your custom affinity using the `affinity` parameter(s). Find more information about Pod affinity in the [Kubernetes documentation](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity).

As an alternative, you can use the preset configurations for pod affinity, pod anti-affinity, and node affinity available at the [bitnami/common](https://github.com/bitnami/charts/tree/main/bitnami/common#affinities) chart. To do so, set the `podAffinityPreset`, `podAntiAffinityPreset`, or `nodeAffinityPreset` parameters.

### Backup and restore

To back up and restore Helm chart deployments on Kubernetes, you need to back up the persistent volumes from the source deployment and attach them to a new deployment using [Velero](https://velero.io/), a Kubernetes backup/restore tool. Find the instructions for using Velero in [this guide](https://techdocs.broadcom.com/us/en/vmware-tanzu/application-catalog/tanzu-application-catalog/services/tac-doc/apps-tutorials-backup-restore-deployments-velero-index.html).

## Persistence

When using `architecture: "high-availability"` the [Bitnami Memcached](https://github.com/bitnami/containers/tree/main/bitnami/memcached) image stores the cache-state at the `/cache-state` path of the container if enabled.

Persistent Volume Claims (PVCs) are used to keep the data across deployments. This is known to work in GCE, AWS, and minikube.

See the [Parameters](#parameters) section to configure the PVC or to disable persistence.

If you encounter errors when working with persistent volumes, refer to our [troubleshooting guide for persistent volumes](https://docs.bitnami.com/kubernetes/faq/troubleshooting/troubleshooting-persistence-volumes/).

## Parameters

### Global parameters

| Name                                                  | Description                                                                                                                                                                                                                                                                                                                                                         | Value   |
| ----------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- |
| `global.imageRegistry`                                | Global Docker image registry                                                                                                                                                                                                                                                                                                                                        | `""`    |
| `global.imagePullSecrets`                             | Global Docker registry secret names as an array                                                                                                                                                                                                                                                                                                                     | `[]`    |
| `global.defaultStorageClass`                          | Global default StorageClass for Persistent Volume(s)                                                                                                                                                                                                                                                                                                                | `""`    |
| `global.storageClass`                                 | DEPRECATED: use global.defaultStorageClass instead                                                                                                                                                                                                                                                                                                                  | `""`    |
| `global.security.allowInsecureImages`                 | Allows skipping image verification                                                                                                                                                                                                                                                                                                                                  | `false` |
| `global.compatibility.openshift.adaptSecurityContext` | Adapt the securityContext sections of the deployment to make them compatible with Openshift restricted-v2 SCC: remove runAsUser, runAsGroup and fsGroup and let the platform use their allowed default IDs. Possible values: auto (apply if the detected running cluster is Openshift), force (perform the adaptation always), disabled (do not perform adaptation) | `auto`  |

### Common parameters

| Name                     | Description                                                                                  | Value           |
| ------------------------ | -------------------------------------------------------------------------------------------- | --------------- |
| `kubeVersion`            | Override Kubernetes version                                                                  | `""`            |
| `nameOverride`           | String to partially override common.names.fullname template (will maintain the release name) | `""`            |
| `fullnameOverride`       | String to fully override common.names.fullname template                                      | `""`            |
| `clusterDomain`          | Kubernetes Cluster Domain                                                                    | `cluster.local` |
| `extraDeploy`            | Extra objects to deploy (evaluated as a template)                                            | `[]`            |
| `commonLabels`           | Add labels to all the deployed resources                                                     | `{}`            |
| `commonAnnotations`      | Add annotations to all the deployed resources                                                | `{}`            |
| `diagnosticMode.enabled` | Enable diagnostic mode (all probes will be disabled and the command will be overridden)      | `false`         |
| `diagnosticMode.command` | Command to override all containers in the deployment/statefulset                             | `["sleep"]`     |
| `diagnosticMode.args`    | Args to override all containers in the deployment/statefulset                                | `["infinity"]`  |

### Memcached parameters

| Name                          | Description                                                                                               | Value                       |
| ----------------------------- | --------------------------------------------------------------------------------------------------------- | --------------------------- |
| `image.registry`              | Memcached image registry                                                                                  | `REGISTRY_NAME`             |
| `image.repository`            | Memcached image repository                                                                                | `REPOSITORY_NAME/memcached` |
| `image.digest`                | Memcached image digest in the way sha256:aa.... Please note this parameter, if set, will override the tag | `""`                        |
| `image.pullPolicy`            | Memcached image pull policy                                                                               | `IfNotPresent`              |
| `image.pullSecrets`           | Specify docker-registry secret names as an array                                                          | `[]`                        |
| `image.debug`                 | Specify if debug values should be set                                                                     | `false`                     |
| `architecture`                | Memcached architecture. Allowed values: standalone or high-availability                                   | `standalone`                |
| `auth.enabled`                | Enable Memcached authentication                                                                           | `false`                     |
| `auth.username`               | Memcached admin user                                                                                      | `""`                        |
| `auth.password`               | Memcached admin password                                                                                  | `""`                        |
| `auth.existingPasswordSecret` | Existing secret with Memcached credentials (must contain a value for `memcached-password` key)            | `""`                        |
| `command`                     | Override default container command (useful when using custom images)                                      | `[]`                        |
| `args`                        | Override default container args (useful when using custom images)                                         | `[]`                        |
| `extraEnvVars`                | Array with extra environment variables to add to Memcached nodes                                          | `[]`                        |
| `extraEnvVarsCM`              | Name of existing ConfigMap containing extra env vars for Memcached nodes                                  | `""`                        |
| `extraEnvVarsSecret`          | Name of existing Secret containing extra env vars for Memcached nodes                                     | `""`                        |

### Deployment/Statefulset parameters

| Name                                                | Description                                                                                                                                                                                                       | Value            |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------- |
| `replicaCount`                                      | Number of Memcached nodes                                                                                                                                                                                         | `1`              |
| `containerPorts.memcached`                          | Memcached container port                                                                                                                                                                                          | `11211`          |
| `livenessProbe.enabled`                             | Enable livenessProbe on Memcached containers                                                                                                                                                                      | `true`           |
| `livenessProbe.initialDelaySeconds`                 | Initial delay seconds for livenessProbe                                                                                                                                                                           | `30`             |
| `livenessProbe.periodSeconds`                       | Period seconds for livenessProbe                                                                                                                                                                                  | `10`             |
| `livenessProbe.timeoutSeconds`                      | Timeout seconds for livenessProbe                                                                                                                                                                                 | `5`              |
| `livenessProbe.failureThreshold`                    | Failure threshold for livenessProbe                                                                                                                                                                               | `6`              |
| `livenessProbe.successThreshold`                    | Success threshold for livenessProbe                                                                                                                                                                               | `1`              |
| `readinessProbe.enabled`                            | Enable readinessProbe on Memcached containers                                                                                                                                                                     | `true`           |
| `readinessProbe.initialDelaySeconds`                | Initial delay seconds for readinessProbe                                                                                                                                                                          | `5`              |
| `readinessProbe.periodSeconds`                      | Period seconds for readinessProbe                                                                                                                                                                                 | `5`              |
| `readinessProbe.timeoutSeconds`                     | Timeout seconds for readinessProbe                                                                                                                                                                                | `3`              |
| `readinessProbe.failureThreshold`                   | Failure threshold for readinessProbe                                                                                                                                                                              | `6`              |
| `readinessProbe.successThreshold`                   | Success threshold for readinessProbe                                                                                                                                                                              | `1`              |
| `startupProbe.enabled`                              | Enable startupProbe on Memcached containers                                                                                                                                                                       | `false`          |
| `startupProbe.initialDelaySeconds`                  | Initial delay seconds for startupProbe                                                                                                                                                                            | `30`             |
| `startupProbe.periodSeconds`                        | Period seconds for startupProbe                                                                                                                                                                                   | `10`             |
| `startupProbe.timeoutSeconds`                       | Timeout seconds for startupProbe                                                                                                                                                                                  | `1`              |
| `startupProbe.failureThreshold`                     | Failure threshold for startupProbe                                                                                                                                                                                | `15`             |
| `startupProbe.successThreshold`                     | Success threshold for startupProbe                                                                                                                                                                                | `1`              |
| `customLivenessProbe`                               | Custom livenessProbe that overrides the default one                                                                                                                                                               | `{}`             |
| `customReadinessProbe`                              | Custom readinessProbe that overrides the default one                                                                                                                                                              | `{}`             |
| `customStartupProbe`                                | Custom startupProbe that overrides the default one                                                                                                                                                                | `{}`             |
| `lifecycleHooks`                                    | for the Memcached container(s) to automate configuration before or after startup                                                                                                                                  | `{}`             |
| `resourcesPreset`                                   | Set container resources according to one common preset (allowed values: none, nano, micro, small, medium, large, xlarge, 2xlarge). This is ignored if resources is set (resources is recommended for production). | `nano`           |
| `resources`                                         | Set container requests and limits for different resources like CPU or memory (essential for production workloads)                                                                                                 | `{}`             |
| `podSecurityContext.enabled`                        | Enabled Memcached pods' Security Context                                                                                                                                                                          | `true`           |
| `podSecurityContext.fsGroupChangePolicy`            | Set filesystem group change policy                                                                                                                                                                                | `Always`         |
| `podSecurityContext.sysctls`                        | Set kernel settings using the sysctl interface                                                                                                                                                                    | `[]`             |
| `podSecurityContext.supplementalGroups`             | Set filesystem extra groups                                                                                                                                                                                       | `[]`             |
| `podSecurityContext.fsGroup`                        | Set Memcached pod's Security Context fsGroup                                                                                                                                                                      | `1001`           |
| `containerSecurityContext.enabled`                  | Enabled containers' Security Context                                                                                                                                                                              | `true`           |
| `containerSecurityContext.seLinuxOptions`           | Set SELinux options in container                                                                                                                                                                                  | `{}`             |
| `containerSecurityContext.runAsUser`                | Set containers' Security Context runAsUser                                                                                                                                                                        | `1001`           |
| `containerSecurityContext.runAsGroup`               | Set containers' Security Context runAsGroup                                                                                                                                                                       | `1001`           |
| `containerSecurityContext.runAsNonRoot`             | Set container's Security Context runAsNonRoot                                                                                                                                                                     | `true`           |
| `containerSecurityContext.privileged`               | Set container's Security Context privileged                                                                                                                                                                       | `false`          |
| `containerSecurityContext.readOnlyRootFilesystem`   | Set container's Security Context readOnlyRootFilesystem                                                                                                                                                           | `true`           |
| `containerSecurityContext.allowPrivilegeEscalation` | Set container's Security Context allowPrivilegeEscalation                                                                                                                                                         | `false`          |
| `containerSecurityContext.capabilities.drop`        | List of capabilities to be dropped                                                                                                                                                                                | `["ALL"]`        |
| `containerSecurityContext.seccompProfile.type`      | Set container's Security Context seccomp profile                                                                                                                                                                  | `RuntimeDefault` |
| `automountServiceAccountToken`                      | Mount Service Account token in pod                                                                                                                                                                                | `false`          |
| `hostAliases`                                       | Add deployment host aliases                                                                                                                                                                                       | `[]`             |
| `podLabels`                                         | Extra labels for Memcached pods                                                                                                                                                                                   | `{}`             |
| `podAnnotations`                                    | Annotations for Memcached pods                                                                                                                                                                                    | `{}`             |
| `podAffinityPreset`                                 | Pod affinity preset. Ignored if `affinity` is set. Allowed values: `soft` or `hard`                                                                                                                               | `""`             |
| `podAntiAffinityPreset`                             | Pod anti-affinity preset. Ignored if `affinity` is set. Allowed values: `soft` or `hard`                                                                                                                          | `soft`           |
| `nodeAffinityPreset.type`                           | Node affinity preset type. Ignored if `affinity` is set. Allowed values: `soft` or `hard`                                                                                                                         | `""`             |
| `nodeAffinityPreset.key`                            | Node label key to match Ignored if `affinity` is set.                                                                                                                                                             | `""`             |
| `nodeAffinityPreset.values`                         | Node label values to match. Ignored if `affinity` is set.                                                                                                                                                         | `[]`             |
| `affinity`                                          | Affinity for pod assignment                                                                                                                                                                                       | `{}`             |
| `nodeSelector`                                      | Node labels for pod assignment                                                                                                                                                                                    | `{}`             |
| `tolerations`                                       | Tolerations for pod assignment                                                                                                                                                                                    | `[]`             |
| `topologySpreadConstraints`                         | Topology Spread Constraints for pod assignment spread across your cluster among failure-domains. Evaluated as a template                                                                                          | `[]`             |
| `podManagementPolicy`                               | StatefulSet controller supports relax its ordering guarantees while preserving its uniqueness and identity guarantees. There are two valid pod management policies: `OrderedReady` and `Parallel`                 | `Parallel`       |
| `priorityClassName`                                 | Name of the existing priority class to be used by Memcached pods, priority class needs to be created beforehand                                                                                                   | `""`             |
| `schedulerName`                                     | Kubernetes pod scheduler registry                                                                                                                                                                                 | `""`             |
| `terminationGracePeriodSeconds`                     | In seconds, time the given to the memcached pod needs to terminate gracefully                                                                                                                                     | `""`             |
| `updateStrategy.type`                               | Memcached statefulset strategy type                                                                                                                                                                               | `RollingUpdate`  |
| `updateStrategy.rollingUpdate`                      | Memcached statefulset rolling update configuration parameters                                                                                                                                                     | `{}`             |
| `emptyDir.medium`                                   | Override emptyDir Volume type, defaults to emptyDir: {}                                                                                                                                                           | `""`             |
| `extraVolumes`                                      | Optionally specify extra list of additional volumes for the Memcached pod(s)                                                                                                                                      | `[]`             |
| `extraVolumeMounts`                                 | Optionally specify extra list of additional volumeMounts for the Memcached container(s)                                                                                                                           | `[]`             |
| `sidecars`                                          | Add additional sidecar containers to the Memcached pod(s)                                                                                                                                                         | `[]`             |
| `initContainers`                                    | Add additional init containers to the Memcached pod(s)                                                                                                                                                            | `[]`             |
| `enableServiceLinks`                                | Whether information about services should be injected into pod's environment variable                                                                                                                             | `true`           |
| `autoscaling.enabled`                               | Enable memcached statefulset autoscaling (requires architecture: "high-availability")                                                                                                                             | `false`          |
| `autoscaling.minReplicas`                           | memcached statefulset autoscaling minimum number of replicas                                                                                                                                                      | `3`              |
| `autoscaling.maxReplicas`                           | memcached statefulset autoscaling maximum number of replicas                                                                                                                                                      | `6`              |
| `autoscaling.targetCPU`                             | memcached statefulset autoscaling target CPU percentage                                                                                                                                                           | `50`             |
| `autoscaling.targetMemory`                          | memcached statefulset autoscaling target CPU memory                                                                                                                                                               | `50`             |
| `pdb.create`                                        | Deploy a pdb object for the Memcached pod                                                                                                                                                                         | `true`           |
| `pdb.minAvailable`                                  | Minimum available Memcached replicas                                                                                                                                                                              | `""`             |
| `pdb.maxUnavailable`                                | Maximum unavailable Memcached replicas                                                                                                                                                                            | `""`             |

### Traffic Exposure parameters

| Name                                    | Description                                                                                                   | Value       |
| --------------------------------------- | ------------------------------------------------------------------------------------------------------------- | ----------- |
| `service.type`                          | Kubernetes Service type                                                                                       | `ClusterIP` |
| `service.ports.memcached`               | Memcached service port                                                                                        | `11211`     |
| `service.nodePorts.memcached`           | Node port for Memcached                                                                                       | `""`        |
| `service.sessionAffinity`               | Control where client requests go, to the same pod or round-robin                                              | `""`        |
| `service.sessionAffinityConfig`         | Additional settings for the sessionAffinity                                                                   | `{}`        |
| `service.clusterIP`                     | Memcached service Cluster IP                                                                                  | `""`        |
| `service.loadBalancerIP`                | Memcached service Load Balancer IP                                                                            | `""`        |
| `service.loadBalancerSourceRanges`      | Memcached service Load Balancer sources                                                                       | `[]`        |
| `service.externalTrafficPolicy`         | Memcached service external traffic policy                                                                     | `Cluster`   |
| `service.annotations`                   | Additional custom annotations for Memcached service                                                           | `{}`        |
| `service.extraPorts`                    | Extra ports to expose in the Memcached service (normally used with the `sidecar` value)                       | `[]`        |
| `networkPolicy.enabled`                 | Enable creation of NetworkPolicy resources                                                                    | `true`      |
| `networkPolicy.allowExternal`           | The Policy model to apply                                                                                     | `true`      |
| `networkPolicy.allowExternalEgress`     | Allow the pod to access any range of port and all destinations.                                               | `true`      |
| `networkPolicy.addExternalClientAccess` | Allow access from pods with client label set to "true". Ignored if `networkPolicy.allowExternal` is true.     | `true`      |
| `networkPolicy.extraIngress`            | Add extra ingress rules to the NetworkPolicy                                                                  | `[]`        |
| `networkPolicy.extraEgress`             | Add extra ingress rules to the NetworkPolicy                                                                  | `[]`        |
| `networkPolicy.ingressPodMatchLabels`   | Labels to match to allow traffic from other pods. Ignored if `networkPolicy.allowExternal` is true.           | `{}`        |
| `networkPolicy.ingressNSMatchLabels`    | Labels to match to allow traffic from other namespaces. Ignored if `networkPolicy.allowExternal` is true.     | `{}`        |
| `networkPolicy.ingressNSPodMatchLabels` | Pod labels to match to allow traffic from other namespaces. Ignored if `networkPolicy.allowExternal` is true. | `{}`        |

### Other Parameters

| Name                                          | Description                                                            | Value   |
| --------------------------------------------- | ---------------------------------------------------------------------- | ------- |
| `serviceAccount.create`                       | Enable creation of ServiceAccount for Memcached pod                    | `true`  |
| `serviceAccount.name`                         | The name of the ServiceAccount to use.                                 | `""`    |
| `serviceAccount.automountServiceAccountToken` | Allows auto mount of ServiceAccountToken on the serviceAccount created | `false` |
| `serviceAccount.annotations`                  | Additional custom annotations for the ServiceAccount                   | `{}`    |

### Persistence parameters

| Name                       | Description                                                              | Value               |
| -------------------------- | ------------------------------------------------------------------------ | ------------------- |
| `persistence.enabled`      | Enable Memcached data persistence using PVC. If false, use emptyDir      | `false`             |
| `persistence.storageClass` | PVC Storage Class for Memcached data volume                              | `""`                |
| `persistence.accessModes`  | PVC Access modes                                                         | `["ReadWriteOnce"]` |
| `persistence.size`         | PVC Storage Request for Memcached data volume                            | `8Gi`               |
| `persistence.annotations`  | Annotations for the PVC                                                  | `{}`                |
| `persistence.labels`       | Labels for the PVC                                                       | `{}`                |
| `persistence.selector`     | Selector to match an existing Persistent Volume for Memcached's data PVC | `{}`                |

### Volume Permissions parameters

| Name                                                        | Description                                                                                                                                                                                                                                           | Value                                |
| ----------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------ |
| `volumePermissions.enabled`                                 | Enable init container that changes the owner and group of the persistent volume                                                                                                                                                                       | `false`                              |
| `volumePermissions.image.registry`                          | Init container volume-permissions image registry                                                                                                                                                                                                      | `REGISTRY_NAME`                      |
| `volumePermissions.image.repository`                        | Init container volume-permissions image repository                                                                                                                                                                                                    | `REPOSITORY_NAME/os-shell`           |
| `volumePermissions.image.digest`                            | Init container volume-permissions image digest in the way sha256:aa.... Please note this parameter, if set, will override the tag                                                                                                                     | `""`                                 |
| `volumePermissions.image.pullPolicy`                        | Init container volume-permissions image pull policy                                                                                                                                                                                                   | `IfNotPresent`                       |
| `volumePermissions.image.pullSecrets`                       | Init container volume-permissions image pull secrets                                                                                                                                                                                                  | `[]`                                 |
| `volumePermissions.resourcesPreset`                         | Set container resources according to one common preset (allowed values: none, nano, micro, small, medium, large, xlarge, 2xlarge). This is ignored if volumePermissions.resources is set (volumePermissions.resources is recommended for production). | `nano`                               |
| `volumePermissions.resources`                               | Set container requests and limits for different resources like CPU or memory (essential for production workloads)                                                                                                                                     | `{}`                                 |
| `volumePermissions.containerSecurityContext.seLinuxOptions` | Set SELinux options in container                                                                                                                                                                                                                      | `{}`                                 |
| `volumePermissions.containerSecurityContext.runAsUser`      | User ID for the init container                                                                                                                                                                                                                        | `0`                                  |
| `metrics.enabled`                                           | Start a side-car prometheus exporter                                                                                                                                                                                                                  | `false`                              |
| `metrics.image.registry`                                    | Memcached exporter image registry                                                                                                                                                                                                                     | `REGISTRY_NAME`                      |
| `metrics.image.repository`                                  | Memcached exporter image repository                                                                                                                                                                                                                   | `REPOSITORY_NAME/memcached-exporter` |
| `metrics.image.digest`                                      | Memcached exporter image digest in the way sha256:aa.... Please note this parameter, if set, will override the tag                                                                                                                                    | `""`                                 |
| `metrics.image.pullPolicy`                                  | Image pull policy                                                                                                                                                                                                                                     | `IfNotPresent`                       |
| `metrics.image.pullSecrets`                                 | Specify docker-registry secret names as an array                                                                                                                                                                                                      | `[]`                                 |
| `metrics.containerPorts.metrics`                            | Memcached Prometheus Exporter container port                                                                                                                                                                                                          | `9150`                               |
| `metrics.resourcesPreset`                                   | Set container resources according to one common preset (allowed values: none, nano, micro, small, medium, large, xlarge, 2xlarge). This is ignored if metrics.resources is set (metrics.resources is recommended for production).                     | `nano`                               |
| `metrics.resources`                                         | Set container requests and limits for different resources like CPU or memory (essential for production workloads)                                                                                                                                     | `{}`                                 |
| `metrics.containerSecurityContext.enabled`                  | Enabled containers' Security Context                                                                                                                                                                                                                  | `true`                               |
| `metrics.containerSecurityContext.seLinuxOptions`           | Set SELinux options in container                                                                                                                                                                                                                      | `{}`                                 |
| `metrics.containerSecurityContext.runAsUser`                | Set containers' Security Context runAsUser                                                                                                                                                                                                            | `1001`                               |
| `metrics.containerSecurityContext.runAsGroup`               | Set containers' Security Context runAsGroup                                                                                                                                                                                                           | `1001`                               |
| `metrics.containerSecurityContext.runAsNonRoot`             | Set container's Security Context runAsNonRoot                                                                                                                                                                                                         | `true`                               |
| `metrics.containerSecurityContext.privileged`               | Set container's Security Context privileged                                                                                                                                                                                                           | `false`                              |
| `metrics.containerSecurityContext.readOnlyRootFilesystem`   | Set container's Security Context readOnlyRootFilesystem                                                                                                                                                                                               | `true`                               |
| `metrics.containerSecurityContext.allowPrivilegeEscalation` | Set container's Security Context allowPrivilegeEscalation                                                                                                                                                                                             | `false`                              |
| `metrics.containerSecurityContext.capabilities.drop`        | List of capabilities to be dropped                                                                                                                                                                                                                    | `["ALL"]`                            |
| `metrics.containerSecurityContext.seccompProfile.type`      | Set container's Security Context seccomp profile                                                                                                                                                                                                      | `RuntimeDefault`                     |
| `metrics.livenessProbe.enabled`                             | Enable livenessProbe on Memcached Prometheus exporter containers                                                                                                                                                                                      | `true`                               |
| `metrics.livenessProbe.initialDelaySeconds`                 | Initial delay seconds for livenessProbe                                                                                                                                                                                                               | `15`                                 |
| `metrics.livenessProbe.periodSeconds`                       | Period seconds for livenessProbe                                                                                                                                                                                                                      | `10`                                 |
| `metrics.livenessProbe.timeoutSeconds`                      | Timeout seconds for livenessProbe                                                                                                                                                                                                                     | `5`                                  |
| `metrics.livenessProbe.failureThreshold`                    | Failure threshold for livenessProbe                                                                                                                                                                                                                   | `3`                                  |
| `metrics.livenessProbe.successThreshold`                    | Success threshold for livenessProbe                                                                                                                                                                                                                   | `1`                                  |
| `metrics.readinessProbe.enabled`                            | Enable readinessProbe on Memcached Prometheus exporter containers                                                                                                                                                                                     | `true`                               |
| `metrics.readinessProbe.initialDelaySeconds`                | Initial delay seconds for readinessProbe                                                                                                                                                                                                              | `5`                                  |
| `metrics.readinessProbe.periodSeconds`                      | Period seconds for readinessProbe                                                                                                                                                                                                                     | `10`                                 |
| `metrics.readinessProbe.timeoutSeconds`                     | Timeout seconds for readinessProbe                                                                                                                                                                                                                    | `3`                                  |
| `metrics.readinessProbe.failureThreshold`                   | Failure threshold for readinessProbe                                                                                                                                                                                                                  | `3`                                  |
| `metrics.readinessProbe.successThreshold`                   | Success threshold for readinessProbe                                                                                                                                                                                                                  | `1`                                  |
| `metrics.startupProbe.enabled`                              | Enable startupProbe on Memcached Prometheus exporter containers                                                                                                                                                                                       | `false`                              |
| `metrics.startupProbe.initialDelaySeconds`                  | Initial delay seconds for startupProbe                                                                                                                                                                                                                | `10`                                 |
| `metrics.startupProbe.periodSeconds`                        | Period seconds for startupProbe                                                                                                                                                                                                                       | `10`                                 |
| `metrics.startupProbe.timeoutSeconds`                       | Timeout seconds for startupProbe                                                                                                                                                                                                                      | `1`                                  |
| `metrics.startupProbe.failureThreshold`                     | Failure threshold for startupProbe                                                                                                                                                                                                                    | `15`                                 |
| `metrics.startupProbe.successThreshold`                     | Success threshold for startupProbe                                                                                                                                                                                                                    | `1`                                  |
| `metrics.customLivenessProbe`                               | Custom livenessProbe that overrides the default one                                                                                                                                                                                                   | `{}`                                 |
| `metrics.customReadinessProbe`                              | Custom readinessProbe that overrides the default one                                                                                                                                                                                                  | `{}`                                 |
| `metrics.customStartupProbe`                                | Custom startupProbe that overrides the default one                                                                                                                                                                                                    | `{}`                                 |
| `metrics.podAnnotations`                                    | Memcached Prometheus exporter pod Annotation and Labels                                                                                                                                                                                               | `{}`                                 |
| `metrics.service.ports.metrics`                             | Prometheus metrics service port                                                                                                                                                                                                                       | `9150`                               |
| `metrics.service.clusterIP`                                 | Static clusterIP or None for headless services                                                                                                                                                                                                        | `""`                                 |
| `metrics.service.sessionAffinity`                           | Control where client requests go, to the same pod or round-robin                                                                                                                                                                                      | `None`                               |
| `metrics.service.annotations`                               | Annotations for the Prometheus metrics service                                                                                                                                                                                                        | `{}`                                 |
| `metrics.serviceMonitor.enabled`                            | Create ServiceMonitor Resource for scraping metrics using Prometheus Operator                                                                                                                                                                         | `false`                              |
| `metrics.serviceMonitor.namespace`                          | Namespace for the ServiceMonitor Resource (defaults to the Release Namespace)                                                                                                                                                                         | `""`                                 |
| `metrics.serviceMonitor.interval`                           | Interval at which metrics should be scraped.                                                                                                                                                                                                          | `""`                                 |
| `metrics.serviceMonitor.scrapeTimeout`                      | Timeout after which the scrape is ended                                                                                                                                                                                                               | `""`                                 |
| `metrics.serviceMonitor.labels`                             | Additional labels that can be used so ServiceMonitor will be discovered by Prometheus                                                                                                                                                                 | `{}`                                 |
| `metrics.serviceMonitor.selector`                           | Prometheus instance selector labels                                                                                                                                                                                                                   | `{}`                                 |
| `metrics.serviceMonitor.relabelings`                        | RelabelConfigs to apply to samples before scraping                                                                                                                                                                                                    | `[]`                                 |
| `metrics.serviceMonitor.metricRelabelings`                  | MetricRelabelConfigs to apply to samples before ingestion                                                                                                                                                                                             | `[]`                                 |
| `metrics.serviceMonitor.honorLabels`                        | Specify honorLabels parameter to add the scrape endpoint                                                                                                                                                                                              | `false`                              |
| `metrics.serviceMonitor.jobLabel`                           | The name of the label on the target service to use as the job name in prometheus.                                                                                                                                                                     | `""`                                 |

The above parameters map to the environment variables defined in the [bitnami/memcached](https://github.com/bitnami/containers/tree/main/bitnami/memcached) container image. For more information please refer to the [bitnami/memcached](https://github.com/bitnami/containers/tree/main/bitnami/memcached) container image documentation.

Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,

```console
helm install my-release --set auth.username=user,auth.password=password oci://REGISTRY_NAME/REPOSITORY_NAME/memcached
```

> Note: You need to substitute the placeholders `REGISTRY_NAME` and `REPOSITORY_NAME` with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use `REGISTRY_NAME=registry-1.docker.io` and `REPOSITORY_NAME=bitnamicharts`.

The above command sets the Memcached admin account username and password to `user` and `password` respectively.

> NOTE: Once this chart is deployed, it is not possible to change the application's access credentials, such as usernames or passwords, using Helm. To change these application credentials after deployment, delete any persistent volumes (PVs) used by the chart and re-deploy it, or use the application's built-in administrative tools if available.

Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,

```console
helm install my-release -f values.yaml oci://REGISTRY_NAME/REPOSITORY_NAME/memcached
```

> Note: You need to substitute the placeholders `REGISTRY_NAME` and `REPOSITORY_NAME` with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use `REGISTRY_NAME=registry-1.docker.io` and `REPOSITORY_NAME=bitnamicharts`.
> **Tip**: You can use the default [values.yaml](https://github.com/bitnami/charts/tree/main/bitnami/memcached/values.yaml)

## Troubleshooting

Find more information about how to deal with common errors related to Bitnami's Helm charts in [this troubleshooting guide](https://docs.bitnami.com/general/how-to/troubleshoot-helm-chart-issues).

## Upgrading

### To 7.6.0

This version introduces image verification for security purposes. To disable it, set `global.security.allowInsecureImages` to `true`. More details at [GitHub issue](https://github.com/bitnami/charts/issues/30850).

### To 7.0.0

This major bump changes the following security defaults:

- `runAsGroup` is changed from `0` to `1001`
- `readOnlyRootFilesystem` is set to `true`
- `resourcesPreset` is changed from `none` to the minimum size working in our test suites (NOTE: `resourcesPreset` is not meant for production usage, but `resources` adapted to your use case).
- `global.compatibility.openshift.adaptSecurityContext` is changed from `disabled` to `auto`.

This could potentially break any customization or init scripts used in your deployment. If this is the case, change the default values to the previous ones.

### To 6.0.0

This major release renames several values in this chart and adds missing features, in order to be inline with the rest of assets in the Bitnami charts repository.

Some affected values are:

- `memcachedUsername` and `memcachedPassword` have regrouped under the `auth` map.
- `arguments` has been renamed to `args`.
- `extraEnv` has been renamed to `extraEnvVars`.
- `service.port`, `service.internalPort` and `service.externalPort` have been regrouped under the `service.ports` map.
- `metrics.kafka.service.port` has been regrouped under the `metrics.kafka.service.ports` map.
- `metrics.jmx.service.port` has been regrouped under the `metrics.jmx.service.ports` map.
- `updateStrategy` (string) and `rollingUpdatePartition` are regrouped under the `updateStrategy` map.

### To 5.3.0

This version introduces `bitnami/common`, a [library chart](https://helm.sh/docs/topics/library_charts/#helm) as a dependency. More documentation about this new utility could be found [here](https://github.com/bitnami/charts/tree/main/bitnami/common#bitnami-common-library-chart). Please, make sure that you have updated the chart dependencies before executing any upgrade.

### To 5.0.0

[On November 13, 2020, Helm v2 support formally ended](https://github.com/helm/charts#status-of-the-project). This major version is the result of the required changes applied to the Helm Chart to be able to incorporate the different features added in Helm v3 and to be consistent with the Helm project itself regarding the Helm v2 EOL.

### To 4.0.0

Backwards compatibility is not guaranteed unless you modify the labels used on the chart's deployments.
Use the workaround below to upgrade from versions previous to 4.0.0. The following example assumes that the release name is memcached:

```console
kubectl delete deployment  memcached --cascade=false
helm upgrade memcached oci://REGISTRY_NAME/REPOSITORY_NAME/memcached
```

> Note: You need to substitute the placeholders `REGISTRY_NAME` and `REPOSITORY_NAME` with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use `REGISTRY_NAME=registry-1.docker.io` and `REPOSITORY_NAME=bitnamicharts`.

### To 3.0.0

This release uses the new bash based `bitnami/memcached` container which uses bash scripts for the start up logic of the container and is smaller in size.

### To 1.0.0

Backwards compatibility is not guaranteed unless you modify the labels used on the chart's deployments.
Use the workaround below to upgrade from versions previous to 1.0.0. The following example assumes that the release name is memcached:

```console
kubectl patch deployment memcached --type=json -p='[{"op": "remove", "path": "/spec/selector/matchLabels/chart"}]'
```

## License

Copyright &copy; 2025 Broadcom. The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

<http://www.apache.org/licenses/LICENSE-2.0>

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.