# Moodle

[Moodle](https://www.moodle.org) is a learning platform designed to provide educators, administrators and learners with a single robust, secure and integrated system to create personalized learning environments

## TL;DR

```console
$ helm repo add bitnami https://charts.bitnami.com/bitnami
$ helm install my-release bitnami/moodle
```

## Introduction

This chart bootstraps a [Moodle](https://github.com/bitnami/bitnami-docker-moodle) deployment on a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.

It also packages the [Bitnami MariaDB chart](https://github.com/kubernetes/charts/tree/master/bitnami/mariadb) which is required for bootstrapping a MariaDB deployment for the database requirements of the Moodle application.

Bitnami charts can be used with [Kubeapps](https://kubeapps.com/) for deployment and management of Helm Charts in clusters. This chart has been tested to work with NGINX Ingress, cert-manager, fluentd and Prometheus on top of the [BKPR](https://kubeprod.io/).

## Prerequisites

- Kubernetes 1.12+
- Helm 2.12+ or Helm 3.0-beta3+
- PV provisioner support in the underlying infrastructure
- ReadWriteMany volumes for deployment scaling

## Installing the Chart

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

```console
$ helm install my-release bitnami/moodle
```

The command deploys Moodle 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`

## Uninstalling the Chart

To uninstall/delete the `my-release` deployment:

```console
$ helm delete my-release
```

The command removes all the Kubernetes components associated with the chart and deletes the release.

## Parameters

The following table lists the configurable parameters of the Moodle chart and their default values per section/component:

### Global parameters

| Parameter                                   | Description                                                                                                           | Default                                                      |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `global.imageRegistry`                      | Global Docker image registry                                                                                          | `nil`                                                        |
| `global.imagePullSecrets`                   | Global Docker registry secret names as an array                                                                       | `[]` (does not add image pull secrets to deployed pods)      |
| `global.storageClass`                       | Global storage class for dynamic provisioning                                                                         | `nil`                                                        |

### Common parameters

| Parameter                                   | Description                                                                                                           | Default                                                      |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `image.registry`                            | Moodle image registry                                                                                                 | `docker.io`                                                  |
| `image.repository`                          | Moodle Image name                                                                                                     | `bitnami/moodle`                                             |
| `image.tag`                                 | Moodle Image tag                                                                                                      | `{TAG_NAME}`                                                 |
| `image.pullPolicy`                          | Moodle image pull policy                                                                                              | `IfNotPresent`                                               |
| `image.pullSecrets`                         | Specify docker-registry secret names as an array                                                                      | `[]` (does not add image pull secrets to deployed pods)      |
| `image.debug`                               | Specify if debug logs should be enabled                                                                               | `false`                                                      |
| `nameOverride`                              | String to partially override moodle.fullname template                                                                 | `nil`                                                        |
| `fullnameOverride`                          | String to fully override moodle.fullname template                                                                     | `nil`                                                        |
| `commonLabels`                              | Labels to add to all deployed objects                                                                                 | `nil`                                                        |
| `commonAnnotations`                         | Annotations to add to all deployed objects                                                                            | `[]`                                                         |
| `extraDeploy`                               | Array of extra objects to deploy with the release (evaluated as a template).                                          | `nil`                                                        |

### Moodle parameters

| Parameter                                   | Description                                                                                                           | Default                                                      |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `affinity`                                  | Map of node/pod affinities                                                                                            | `{}`                                                         |
| `allowEmptyPassword`                        | Allow DB blank passwords                                                                                              | true                                                         |
| `args`                                      | Override default container args (useful when using custom images)                                                     | `nil`                                                        |
| `command`                                   | Override default container command (useful when using custom images)                                                  | `nil`                                                        |
| `containerPorts.http`                       | Sets http port inside Moodle container                                                                                | `8080`                                                       |
| `containerPorts.https`                      | Sets https port inside Moodle container                                                                               | `8443`                                                       |
| `containerSecurityContext.enabled`          | Enable Moodle containers' Security Context                                                                            | `true`                                                       |
| `containerSecurityContext.runAsUser`        | Moodle containers' Security Context                                                                                   | `1001`                                                       |
| `customLivenessProbe`                       | Override default liveness probe                                                                                       | `nil`                                                        |
| `customReadinessProbe`                      | Override default readiness probe                                                                                      | `nil`                                                        |
| `existingSecret`                            | Name of a secret with the application password                                                                        | `nil`                                                        |
| `extraEnvVarsCM`                            | ConfigMap containing extra env vars                                                                                   | `nil`                                                        |
| `extraEnvVarsSecret`                        | Secret containing extra env vars (in case of sensitive data)                                                          | `nil`                                                        |
| `extraEnvVars`                              | Extra environment variables                                                                                           | `nil`                                                        |
| `extraVolumeMounts`                         | Array of extra volume mounts to be added to the container (evaluated as template). Normally used with `extraVolumes`. | `nil`                                                        |
| `extraVolumes`                              | Array of extra volumes to be added to the deployment (evaluated as template). Requires setting `extraVolumeMounts`    | `nil`                                                        |
| `initContainers`                            | Add additional init containers to the pod (evaluated as a template)                                                   | `nil`                                                        |
| `lifecycleHooks`                            | LifecycleHook to set additional configuration at startup Evaluated as a template                                      | ``                                                           |
| `livenessProbe`                             | Liveness probe configuration                                                                                          | `Check values.yaml file`                                     |
| `moodleSkipInstall`                         | Skip moodle installation wizard (true / false)                                                                        | `false`                                                      |
| `moodleUsername`                            | User of the application                                                                                               | `user`                                                       |
| `moodlePassword`                            | Application password                                                                                                  | _random 10 character alphanumeric string_                    |
| `moodleEmail`                               | Admin email                                                                                                           | `user@example.com`                                           |
| `nodeSelector`                              | Node labels for pod assignment                                                                                        | `{}` (The value is evaluated as a template)                  |
| `persistence.accessMode`                    | PVC Access Mode for Moodle volume                                                                                     | `ReadWriteOnce`                                              |
| `persistence.enabled`                       | Enable persistence using PVC                                                                                          | `true`                                                       |
| `persistence.existingClaim`                 | An Existing PVC name                                                                                                  | `nil`                                                        |
| `persistence.hostPath`                      | Host mount path for Moodle volume                                                                                     | `nil` (will not mount to a host path)                        |
| `persistence.size`                          | PVC Storage Request for Moodle volume                                                                                 | `8Gi`                                                        |
| `persistence.storageClass`                  | PVC Storage Class for Moodle volume                                                                                   | `nil` (uses alpha storage class annotation)                  |
| `podAnnotations`                            | Pod annotations                                                                                                       | `{}`                                                         |
| `podLabels`                                 | Add additional labels to the pod (evaluated as a template)                                                            | `nil`                                                        |
| `podSecurityContext.enabled`                | Enable Moodle pods' Security Context                                                                                  | `true`                                                       |
| `podSecurityContext.fsGroup`                | Moodle pods' group ID                                                                                                 | `1001`                                                       |
| `readinessProbe`                            | Readiness probe configuration                                                                                         | `Check values.yaml file`                                     |
| `replicaCount`                              | Number of Moodle Pods to run                                                                                          | `1`                                                          |
| `resources`                                 | CPU/Memory resource requests/limits                                                                                   | Memory: `512Mi`, CPU: `300m`                                 |
| `sidecars`                                  | Attach additional containers to the pod (evaluated as a template)                                                     | `nil`                                                        |
| `smtpHost`                                  | SMTP host                                                                                                             | `nil`                                                        |
| `smtpPort`                                  | SMTP port                                                                                                             | `nil` (but moodle internal default is 25)                    |
| `smtpProtocol`                              | SMTP Protocol (options: ssl,tls, nil)                                                                                 | `nil`                                                        |
| `smtpUser`                                  | SMTP user                                                                                                             | `nil`                                                        |
| `smtpPassword`                              | SMTP password                                                                                                         | `nil`                                                        |
| `tolerations`                               | Tolerations for pod assignment                                                                                        | `[]` (The value is evaluated as a template)                  |
| `updateStrategy`                            | Deployment update strategy                                                                                            | `nil`                                                        |

### Traffic Exposure Parameters

| Parameter                                   | Description                                                                                                           | Default                                                      |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `service.type`                              | Kubernetes Service type                                                                                               | `LoadBalancer`                                               |
| `service.port`                              | Service HTTP port                                                                                                     | `80`                                                         |
| `service.httpsPort`                         | Service HTTPS port                                                                                                    | `443`                                                        |
| `service.externalTrafficPolicy`             | Enable client source IP preservation                                                                                  | `Cluster`                                                    |
| `service.nodePorts.http`                    | Kubernetes http node port                                                                                             | `""`                                                         |
| `service.nodePorts.https`                   | Kubernetes https node port                                                                                            | `""`                                                         |
| `ingress.enabled`                           | Enable ingress controller resource                                                                                    | `false`                                                      |
| `ingress.certManager`                       | Add annotations for cert-manager                                                                                      | `false`                                                      |
| `ingress.hostname`                          | Default host for the ingress resource                                                                                 | `moodle.local`                                               |
| `ingress.annotations`                       | Ingress annotations                                                                                                   | `{}`                                                         |
| `ingress.hosts[0].name`                     | Hostname to your Moodle installation                                                                                  | `nil`                                                        |
| `ingress.hosts[0].path`                     | Path within the url structure                                                                                         | `nil`                                                        |
| `ingress.tls[0].hosts[0]`                   | TLS hosts                                                                                                             | `nil`                                                        |
| `ingress.tls[0].secretName`                 | TLS Secret (certificates)                                                                                             | `nil`                                                        |
| `ingress.secrets[0].name`                   | TLS Secret Name                                                                                                       | `nil`                                                        |
| `ingress.secrets[0].certificate`            | TLS Secret Certificate                                                                                                | `nil`                                                        |
| `ingress.secrets[0].key`                    | TLS Secret Key                                                                                                        | `nil`                                                        |

### Database parameters

| Parameter                                   | Description                                                                                                           | Default                                                      |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `mariadb.enabled`                           | Whether to use the MariaDB chart                                                                                      | `true`                                                       |
| `mariadb.architecture`                      | MariaDB architecture (`standalone` or `replication`)                                                                  | `standalone`                                                 |
| `mariadb.auth.rootPassword`                 | Password for the MariaDB `root` user                                                                                  | _random 10 character alphanumeric string_                    |
| `mariadb.auth.database`                     | Database name to create                                                                                               | `bitnami_moodle`                                             |
| `mariadb.auth.username`                     | Database user to create                                                                                               | `bn_moodle`                                                  |
| `mariadb.auth.password`                     | Password for the database                                                                                             | _random 10 character long alphanumeric string_               |
| `mariadb.primary.persistence.enabled`       | Enable database persistence using PVC                                                                                 | `true`                                                       |
| `mariadb.primary.persistence.existingClaim` | Name of an existing `PersistentVolumeClaim` for MariaDB primary replicas                                              | `nil`                                                        |
| `mariadb.primary.persistence.accessMode`    | Database Persistent Volume Access Modes                                                                               | `[ReadWriteOnce]`                                            |
| `mariadb.primary.persistence.size`          | Database Persistent Volume Size                                                                                       | `8Gi`                                                        |
| `mariadb.primary.persistence.storageClass`  | MariaDB primary persistent volume storage Class                                                                       | `nil` (uses alpha storage class annotation)                  |
| `mariadb.primary.persistence.hostPath`      | Host mount path for MariaDB volume                                                                                    | `nil` (will not mount to a host path)                        |
| `externalDatabase.username`                 | Existing username in the external db                                                                                  | `bn_moodle`                                                  |
| `externalDatabase.password`                 | Password for the above username                                                                                       | `nil`                                                        |
| `externalDatabase.database`                 | Name of the existing database                                                                                         | `bitnami_moodle`                                             |
| `externalDatabase.host`                     | Host of the existing database                                                                                         | `nil`                                                        |
| `externalDatabase.port`                     | Port of the existing database                                                                                         | `3306`                                                       |

### Volume Permissions parameters

| Parameter                                   | Description                                                                                                                                               | Default                                                      |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `volumePermissions.enabled`                 | Enable init container that changes volume permissions in the data directory (for cases where the default k8s `runAsUser` and `fsUser` values do not work) | `false`                                                      |
| `volumePermissions.image.registry`          | Init container volume-permissions image registry                                                                                                          | `docker.io`                                                  |
| `volumePermissions.image.repository`        | Init container volume-permissions image name                                                                                                              | `bitnami/minideb`                                            |
| `volumePermissions.image.tag`               | Init container volume-permissions image tag                                                                                                               | `buster`                                                     |
| `volumePermissions.image.pullSecrets`       | Specify docker-registry secret names as an array                                                                                                          | `[]` (does not add image pull secrets to deployed pods)      |
| `volumePermissions.image.pullPolicy`        | Init container volume-permissions image pull policy                                                                                                       | `Always`                                                     |
| `volumePermissions.resources`               | Init container resource requests/limit                                                                                                                    | `nil`                                                        |

### Metrics parameters

| Parameter                                   | Description                                                                                                           | Default                                                      |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `metrics.enabled`                           | Start a side-car prometheus exporter                                                                                  | `false`                                                      |
| `metrics.image.registry`                    | Apache exporter image registry                                                                                        | `docker.io`                                                  |
| `metrics.image.repository`                  | Apache exporter image name                                                                                            | `bitnami/apache-exporter`                                    |
| `metrics.image.tag`                         | Apache exporter image tag                                                                                             | `{TAG_NAME}`                                                 |
| `metrics.image.pullPolicy`                  | Image pull policy                                                                                                     | `IfNotPresent`                                               |
| `metrics.image.pullSecrets`                 | Specify docker-registry secret names as an array                                                                      | `[]` (does not add image pull secrets to deployed pods)      |
| `metrics.podAnnotations`                    | Additional annotations for Metrics exporter pod                                                                       | `{prometheus.io/scrape: "true", prometheus.io/port: "9117"}` |
| `metrics.resources`                         | Exporter resource requests/limit                                                                                      | `{}`                                                         |

### Certificate injection parameters

| Parameter                                            | Description                                                                                                                                               | Default                                                      |
|------------------------------------------------------|--------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|
| `certificates.customCertificate.certificateSecret`   | Secret containing the certificate and key to add                                                             | `""`                                                         |
| `certificates.customCertificate.chainSecret.name`    | Name of the secret containing the certificate chain                                                          | `""`                                                         |
| `certificates.customCertificate.chainSecret.key`     | Key of the certificate chain file inside the secret                                                          | `""`                                                         |
| `certificates.customCertificate.certificateLocation` | Location in the container to store the certificate                                                           | `/etc/ssl/certs/ssl-cert-snakeoil.pem`                       |
| `certificates.customCertificate.keyLocation`         | Location in the container to store the private key                                                           | `/etc/ssl/private/ssl-cert-snakeoil.key`                     |
| `certificates.customCertificate.chainLocation`       | Location in the container to store the certificate chain                                                     | `/etc/ssl/certs/chain.pem`                                   |
| `certificates.customCAs`                             | Defines a list of secrets to import into the container trust store                                           | `[]`                                                         |
| `certificates.image.registry`                        | Container sidecar registry                                                                                   | `docker.io`                                                  |
| `certificates.image.repository`                      | Container sidecar image                                                                                      | `bitnami/minideb`                                            |
| `certificates.image.tag`                             | Container sidecar image tag                                                                                  | `buster`                                                     |
| `certificates.image.pullPolicy`                      | Container sidecar image pull policy                                                                          | `IfNotPresent`                                               |
| `certificates.image.pullSecrets`                     | Container sidecar image pull secrets                                                                         | `image.pullSecrets`                                          |
| `certificates.args`                                  | Override default container args (useful when using custom images)                                            | `nil`                                                        |
| `certificates.command`                               | Override default container command (useful when using custom images)                                         | `nil`                                                        |
| `certificates.extraEnvVars`                          | Container sidecar extra environment variables (eg proxy)                                                     | `[]`                                                         |
| `certificates.extraEnvVarsCM`                        | ConfigMap containing extra env vars                                                                          | `nil`                                                        |
| `certificates.extraEnvVarsSecret`                    | Secret containing extra env vars (in case of sensitive data)                                                 | `nil`                                                        |


The above parameters map to the env variables defined in [bitnami/moodle](http://github.com/bitnami/bitnami-docker-moodle). For more information please refer to the [bitnami/moodle](http://github.com/bitnami/bitnami-docker-moodle) image documentation.

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

```console
$ helm install my-release \
  --set moodleUsername=admin,moodlePassword=password,mariadb.auth.rootPassword=secretpassword \
    bitnami/moodle
```

The above command sets the Moodle administrator account username and password to `admin` and `password` respectively. Additionally, it sets the MariaDB `root` user password to `secretpassword`.

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

```console
$ helm install my-release -f values.yaml bitnami/moodle
```

> **Tip**: You can use the default [values.yaml](values.yaml)

## Configuration and installation details

### [Rolling VS Immutable tags](https://docs.bitnami.com/containers/how-to/understand-rolling-tags-containers/)

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.

### Ingress without TLS

For using ingress (example without TLS):

```console
ingress.enabled=True
ingress.hosts[0]=moodle.domain.com
serviceType=ClusterIP
moodleUsername=admin
moodlePassword=password
mariadb.mariadbRootPassword=secretpassword
```

These are the *3 mandatory parameters* when *Ingress* is desired: `ingress.enabled=True`, `ingress.hosts[0]=moodle.domain.com` and `serviceType=ClusterIP`

### Ingress TLS

If your cluster allows automatic creation/retrieval of TLS certificates (e.g. [kube-lego](https://github.com/jetstack/kube-lego)), please refer to the documentation for that mechanism.

To manually configure TLS, first create/retrieve a key & certificate pair for the address(es) you wish to protect. Then create a TLS secret (named `moodle-server-tls` in this example) in the namespace. Include the secret's name, along with the desired hostnames, in the Ingress TLS section of your custom `values.yaml` file:

```yaml
ingress:
  ## If true, Moodle server Ingress will be created
  ##
  enabled: true

  ## Moodle server Ingress annotations
  ##
  annotations: {}
  #   kubernetes.io/ingress.class: nginx
  #   kubernetes.io/tls-acme: 'true'

  ## Moodle server Ingress hostnames
  ## Must be provided if Ingress is enabled
  ##
  hosts:
    - moodle.domain.com

  ## Moodle server Ingress TLS configuration
  ## Secrets must be manually created in the namespace
  ##
  tls:
    - secretName: moodle-server-tls
      hosts:
        - moodle.domain.com
```

## Persistence

The [Bitnami Moodle](https://github.com/bitnami/bitnami-docker-moodle) image stores the Moodle data and configurations at the `/bitnami/moodle` and `/bitnami/apache` paths of the container.

Persistent Volume Claims are used to keep the data across deployments. This is known to work in GCE, AWS, vpshere, and minikube.
See the [Parameters](#parameters) section to configure the PVC or to disable persistence.
You may want to review the [PV reclaim policy](https://kubernetes.io/docs/tasks/administer-cluster/change-pv-reclaim-policy/) and update as required. By default, it's set to delete, and when Moodle is uninstalled, data is also removed.

## Upgrading

### To 9.0.0

MariaDB dependency version was bumped to a new major version that introduces several incompatilibites. Therefore, backwards compatibility is not guaranteed unless an external database is used. Check [MariaDB Upgrading Notes](https://github.com/bitnami/charts/tree/master/bitnami/mariadb#to-800) for more information.

To upgrade to `9.0.0`, it should be done reusing the PVCs used to hold both the MariaDB and Moodle data on your previous release. To do so, follow the instructions below (the following example assumes that the release name is `moodle`):

> NOTE: Please, create a backup of your database before running any of those actions. The steps below would be only valid if your application (e.g. any plugins or custom code) is compatible with MariaDB 10.5.x

Obtain the credentials and the names of the PVCs used to hold both the MariaDB and Moodle data on your current release:

```console
export MOODLE_PASSWORD=$(kubectl get secret --namespace default moodle -o jsonpath="{.data.moodle-password}" | base64 --decode)
export MARIADB_ROOT_PASSWORD=$(kubectl get secret --namespace default moodle-mariadb -o jsonpath="{.data.mariadb-root-password}" | base64 --decode)
export MARIADB_PASSWORD=$(kubectl get secret --namespace default moodle-mariadb -o jsonpath="{.data.mariadb-password}" | base64 --decode)
export MARIADB_PVC=$(kubectl get pvc -l app=mariadb,component=master,release=moodle -o jsonpath="{.items[0].metadata.name}")
```

Upgrade your release (maintaining the version) disabling MariaDB and scaling Moodle replicas to 0:

```console
$ helm upgrade moodle bitnami/moodle --set moodlePassword=$MOODLE_PASSWORD --set replicaCount=0 --set mariadb.enabled=false --version 8.1.6
```

Finally, upgrade you release to 9.0.0 reusing the existing PVC, and enabling back MariaDB:

```console
$ helm upgrade moodle bitnami/moodle --set mariadb.primary.persistence.existingClaim=$MARIADB_PVC --set mariadb.auth.rootPassword=$MARIADB_ROOT_PASSWORD --set mariadb.auth.password=$MARIADB_PASSWORD --set moodlePassword=$MOODLE_PASSWORD
```

You should see the lines below in MariaDB container logs:

```console
$ kubectl logs $(kubectl get pods -l app.kubernetes.io/instance=moodle,app.kubernetes.io/name=mariadb,app.kubernetes.io/component=primary -o jsonpath="{.items[0].metadata.name}")
...
mariadb 12:13:24.98 INFO  ==> Using persisted data
mariadb 12:13:25.01 INFO  ==> Running mysql_upgrade
...
```

### To 8.0.0

The [Bitnami Moodle](https://github.com/bitnami/bitnami-docker-moodle) image was updated to support "non-root" user approach, however, **it is not enabled by default**. The container still runs as the `root` user and the Apache daemon is started as the `daemon` user, due to running Cron as a service, which requires running as root.

If you want to run with a non-root user, you need to set `podSecurityContext.enabled=true` and `containerSecurity.context.enabled=true`. In addition to that, you will also need to change the default Apache HTTP ports to run as a non-privileged user by setting `containerPorts.http` and `containerPorts.https` to a non-privileged port number (higher than 1024, i.e. 8080 and 8443, respectively). Note that, when running as a non-root user, Cron will not supported and therefore scheduled tasks will not be enabled for Moodle.

This upgrade also adapts the chart to the latest Bitnami good practices. Check the Parameters section for more information.

### To 7.0.0

Helm performs a lookup for the object based on its group (apps), version (v1), and kind (Deployment). Also known as its GroupVersionKind, or GVK. Changing the GVK is considered a compatibility breaker from Kubernetes' point of view, so you cannot "upgrade" those objects to the new GVK in-place. Earlier versions of Helm 3 did not perform the lookup correctly which has since been fixed to match the spec.

In https://github.com/helm/charts/pull/17301 the `apiVersion` of the deployment resources was updated to `apps/v1` in tune with the api's deprecated, resulting in compatibility breakage.

This major version signifies this change.

### To 3.0.0

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 3.0.0. The following example assumes that the release name is moodle:

```console
$ kubectl patch deployment moodle-moodle --type=json -p='[{"op": "remove", "path": "/spec/selector/matchLabels/chart"}]'
$ kubectl delete statefulset moodle-mariadb --cascade=false
```
