# PostgreSQL HA

This Helm chart has been developed based on [bitnami/postgresql](https://github.com/bitnami/charts/tree/master/bitnami/postgresql) chart but including some changes to guarantee high availability such as:

- A new deployment, service and ingress have been added to deploy [Pgpool-II](Pgpool-II) to act as proxy for PostgreSQL backend. It helps to reduce connection overhead, acts as a load balancer for PostgreSQL, and ensures database node failover.
- Replacing `bitnami/postgresql` with `bitnami/postgresql-repmgr` which includes and configures [repmgr](https://repmgr.org/). Repmgr ensures standby nodes assume the primary role when the primary node is unhealthy.

## TL;DR;

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

## Introduction

This [Helm](https://github.com/kubernetes/helm) chart installs [PostgreSQL](https://www.postgresql.org/) with HA architecture in a Kubernetes cluster. Welcome to [contribute](CONTRIBUTING.md) to Helm Chart for PostgreSQL HA.

## Prerequisites

- Kubernetes 1.12+
- Helm 2.11+ or Helm 3.0-beta3+

## Installing the Chart

Install the PostgreSQL HA helm chart with a release name `my-release`:

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

## Uninstalling the Chart

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

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

Additionaly, if `persistence.resourcePolicy` is set to `keep`, you should manually delete the PVCs.

## Parameters

The following table lists the configurable parameters of the PostgreSQL HA chart and the default values. They can be configured in `values.yaml` or set via `--set` flag during installation.

| Parameter                                      | Description                                                                                                                                                          | Default                                                      |
| ---------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------ |
| **Global**                                     |                                                                                                                                                                      |                                                              |
| `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`                                                        |
| `global.postgresql.existingSecret`             | Name of existing secret to use for PostgreSQL passwords (overrides `postgresql.existingSecret`)                                                                      | `nil`                                                        |
| `global.postgresql.username`                   | PostgreSQL username (overrides `postgresql.username`)                                                                                                                | `nil`                                                        |
| `global.postgresql.password`                   | PostgreSQL password (overrides `postgresql.password`)                                                                                                                | `nil`                                                        |
| `global.postgresql.database`                   | PostgreSQL database (overrides `postgresql.database`)                                                                                                                | `nil`                                                        |
| `global.postgresql.repmgrUsername`             | PostgreSQL repmgr username (overrides `postgresql.repmgrUsername`)                                                                                                   | `nil`                                                        |
| `global.postgresql.repmgrPassword`             | PostgreSQL repmgr password (overrides `postgresql.repmgrpassword`)                                                                                                   | `nil`                                                        |
| `global.postgresql.repmgrDatabase`             | PostgreSQL repmgr database (overrides `postgresql.repmgrDatabase`)                                                                                                   | `nil`                                                        |
| `global.ldap.existingSecret`                   | Name of existing secret to use for LDAP passwords (overrides `ldap.existingSecret`)                                                                                  | `nil`                                                        |
| `global.ldap.bindpw`                           | LDAP bind password (overrides `ldap.bindpw`)                                                                                                                         | `nil`                                                        |
| `global.pgpool.adminUsername`                  | Pgpool Admin username (overrides `pgpool.adminUsername`)                                                                                                             | `nil`                                                        |
| `global.pgpool.adminPassword`                  | Pgpool Admin password (overrides `pgpool.adminPassword`)                                                                                                             | `nil`                                                        |
| **General**                                    |                                                                                                                                                                      |                                                              |
| `nameOverride`                                 | String to partially override postgres-ha.fullname template with a string                                                                                             | `nil`                                                        |
| `fullnameOverride`                             | String to fully override postgres-ha.fullname template with a string                                                                                                 | `nil`                                                        |
| `clusterDomain`                                | Default Kubernetes cluster domain                                                                                                                                    | `cluster.local`                                              |
| **PostgreSQL with Repmgr**                     |                                                                                                                                                                      |                                                              |
| `postgresqlImage.registry`                     | Registry for PostgreSQL with Repmgr image                                                                                                                            | `docker.io`                                                  |
| `postgresqlImage.repository`                   | Repository for PostgreSQL with Repmgr image                                                                                                                          | `bitnami/postgresql-repmgr`                                  |
| `postgresqlImage.tag`                          | Tag for PostgreSQL with Repmgr image                                                                                                                                 | `{TAG_NAME}`                                                 |
| `postgresqlImage.pullPolicy`                   | PostgreSQL with Repmgr image pull policy                                                                                                                             | `IfNotPresent`                                               |
| `postgresqlImage.pullSecrets`                  | Specify docker-registry secret names as an array                                                                                                                     | `[]` (does not add image pull secrets to deployed pods)      |
| `postgresqlImage.debug`                        | Specify if debug logs should be enabled                                                                                                                              | `false`                                                      |
| `postgresql.labels`                            | Map of labels to add to the statefulset. Evaluated as a template                                                                                                     | `{}`                                                         |
| `postgresql.podLabels`                         | Map of labels to add to the pods. Evaluated as a template                                                                                                            | `{}`                                                         |
| `postgresql.replicaCount`                      | The number of replicas to deploy                                                                                                                                     | `2`                                                          |
| `postgresql.updateStrategyType`                | Statefulset update strategy policy                                                                                                                                   | `RollingUpdate`                                              |
| `postgresql.podAnnotations`                    | Additional pod annotations                                                                                                                                           | `{}`                                                         |
| `postgresql.affinity`                          | Map of node/pod affinities                                                                                                                                           | `{}` (The value is evaluated as a template)                  |
| `postgresql.nodeSelector`                      | Node labels for pod assignment                                                                                                                                       | `{}` (The value is evaluated as a template)                  |
| `postgresql.priorityClassName`                 | Pod priority class                                                                                                                                                   | ``                                                           |
| `postgresql.tolerations`                       | Tolerations for pod assignment                                                                                                                                       | `[]` (The value is evaluated as a template)                  |
| `postgresql.securityContext.enabled`           | Enable security context for PostgreSQL with Repmgr                                                                                                                   | `true`                                                       |
| `postgresql.securityContext.fsGroup`           | Group ID for the PostgreSQL with Repmgr filesystem                                                                                                                   | `1001`                                                       |
| `postgresql.securityContext.runAsUser`         | User ID for the PostgreSQL with Repmgr container                                                                                                                     | `1001`                                                       |
| `postgresql.resources`                         | The [resources] to allocate for container                                                                                                                            | `{}`                                                         |
| `postgresql.livenessProbe`                     | Liveness probe configuration for PostgreSQL with Repmgr                                                                                                              | `Check values.yaml file`                                     |
| `postgresql.readinessProbe`                    | Readiness probe configuration for PostgreSQL with Repmgr                                                                                                             | `Check values.yaml file`                                     |
| `postgresql.pdb.create`                        | If true, create a pod disruption budget for PostgreSQL with Repmgr pods                                                                                              | `false`                                                      |
| `postgresql.pdb.minAvailable`                  | Minimum number / percentage of pods that should remain scheduled                                                                                                     | `1`                                                          |
| `postgresql.pdb.maxUnavailable`                | Maximum number / percentage of pods that may be made unavailable                                                                                                     | `nil`                                                        |
| `postgresql.username`                          | PostgreSQL username                                                                                                                                                  | `postgres`                                                   |
| `postgresql.password`                          | PostgreSQL password                                                                                                                                                  | `nil`                                                        |
| `postgresql.database`                          | PostgreSQL database                                                                                                                                                  | `postgres`                                                   |
| `postgresql.upgradeRepmgrExtension`            | Upgrade repmgr extension in the database                                                                                                                             | `false`                                                      |
| `postgresql.pgHbaTrustAll`                     | Configures PostgreSQL HBA to trust every user                                                                                                                        | `false`                                                      |
| `postgresql.repmgrUsername`                    | PostgreSQL repmgr username                                                                                                                                           | `repmgr`                                                     |
| `postgresql.repmgrPassword`                    | PostgreSQL repmgr password                                                                                                                                           | `nil`                                                        |
| `postgresql.repmgrDatabase`                    | PostgreSQL repmgr database                                                                                                                                           | `repmgr`                                                     |
| `postgresql.repmgrLogLevel`                    | Repmgr log level (DEBUG, INFO, NOTICE, WARNING, ERROR, ALERT, CRIT or EMERG)                                                                                         | `NOTICE`                                                     |
| `postgresql.repmgrConnectTimeout`              | Repmgr backend connection timeout (in seconds)                                                                                                                       | `5`                                                          |
| `postgresql.repmgrReconnectAttempts`           | Repmgr backend reconnection attempts                                                                                                                                 | `3`                                                          |
| `postgresql.repmgrReconnectInterval`           | Repmgr backend reconnection interval (in seconds)                                                                                                                    | `5`                                                          |
| `postgresql.repmgrConfiguration`               | Repmgr Configuration                                                                                                                                                 | `nil`                                                        |
| `postgresql.configuration`                     | PostgreSQL Configuration                                                                                                                                             | `nil`                                                        |
| `postgresql.pgHbaConfiguration`                | Content of pg\_hba.conf                                                                                                                                              | `nil (do not create pg_hba.conf)`                            |
| `postgresql.configurationCM`                   | ConfigMap with the PostgreSQL configuration files (Note: Overrides `postgresql.repmgrConfiguration`, `postgresql.configuration` and `postgresql.pgHbaConfiguration`) | `nil` (The value is evaluated as a template)                 |
| `postgresql.extendedConf`                      | Extended PostgreSQL Configuration (appended to main or default configuration)                                                                                        | `nil`                                                        |
| `postgresql.extendedConfCM`                    | ConfigMap with the extended PostgreSQL configuration files (Note: Overrides `postgresql.extendedConf`)                                                               | `nil` (The value is evaluated as a template)                 |
| `postgresql.initdbScripts`                     | Dictionary of initdb scripts                                                                                                                                         | `nil`                                                        |
| `postgresql.initdbScriptsCM`                   | ConfigMap with the initdb scripts (Note: Overrides `initdbScripts`). The value is evaluated as a template.                                                           | `nil`                                                        |
| `postgresql.initdbScriptsSecret`               | Secret with initdb scripts that contain sensitive information (Note: can be used with initdbScriptsCM or initdbScripts). The value is evaluated as a template.       | `nil`                                                        |
| **Pgpool**                                     |                                                                                                                                                                      |                                                              |
| `pgpoolImage.registry`                         | Registry for Pgpool                                                                                                                                                  | `docker.io`                                                  |
| `pgpoolImage.repository`                       | Repository for Pgpool                                                                                                                                                | `bitnami/pgpool`                                             |
| `pgpoolImage.tag`                              | Tag for Pgpool                                                                                                                                                       | `{TAG_NAME}`                                                 |
| `pgpoolImage.pullPolicy`                       | Pgpool image pull policy                                                                                                                                             | `IfNotPresent`                                               |
| `pgpoolImage.pullSecrets`                      | Specify docker-registry secret names as an array                                                                                                                     | `[]` (does not add image pull secrets to deployed pods)      |
| `pgpoolImage.debug`                            | Specify if debug logs should be enabled                                                                                                                              | `false`                                                      |
| `pgpool.labels`                                | Map of labels to add to the deployment. Evaluated as a template                                                                                                      | `{}`                                                         |
| `pgpool.podLabels`                             | Map of labels to add to the pods. Evaluated as a template                                                                                                            | `{}`                                                         |
| `pgpool.replicaCount`                          | The number of replicas to deploy                                                                                                                                     | `2`                                                          |
| `pgpool.podAnnotations`                        | Additional pod annotations                                                                                                                                           | `{}`                                                         |
| `pgpool.affinity`                              | Map of node/pod affinities                                                                                                                                           | `{}` (The value is evaluated as a template)                  |
| `pgpool.initdbScripts`                         | Dictionary of initdb scripts                                                                                                                                         | `nil`                                                        |
| `pgpool.initdbScriptsCM`                       | ConfigMap with the initdb scripts (Note: Overrides `initdbScripts`). The value is evaluated as a template.                                                           | `nil`                                                        |
| `pgpool.initdbScriptsSecret`                   | Secret with initdb scripts that contain sensitive information (Note: can be used with initdbScriptsCM or initdbScripts). The value is evaluated as a template.       | `nil`                                                        |
| `pgpool.nodeSelector`                          | Node labels for pod assignment                                                                                                                                       | `{}` (The value is evaluated as a template)                  |
| `pgpool.priorityClassName`                     | Pod priority class                                                                                                                                                   | ``                                                           |
| `pgpool.tolerations`                           | Tolerations for pod assignment                                                                                                                                       | `[]` (The value is evaluated as a template)                  |
| `pgpool.securityContext.enabled`               | Enable security context for Pgpool                                                                                                                                   | `true`                                                       |
| `pgpool.securityContext.fsGroup`               | Group ID for the Pgpool filesystem                                                                                                                                   | `1001`                                                       |
| `pgpool.securityContext.runAsUser`             | User ID for the Pgpool container                                                                                                                                     | `1001`                                                       |
| `pgpool.resources`                             | The [resources] to allocate for container                                                                                                                            | `{}`                                                         |
| `pgpool.livenessProbe`                         | Liveness probe configuration for Pgpool                                                                                                                              | `Check values.yaml file`                                     |
| `pgpool.readinessProbe`                        | Readiness probe configuration for Pgpool                                                                                                                             | `Check values.yaml file`                                     |
| `pgpool.pdb.create`                            | If true, create a pod disruption budget for Pgpool pods.                                                                                                             | `false`                                                      |
| `pgpool.pdb.minAvailable`                      | Minimum number / percentage of pods that should remain scheduled                                                                                                     | `1`                                                          |
| `pgpool.pdb.maxUnavailable`                    | Maximum number / percentage of pods that may be made unavailable                                                                                                     | `nil`                                                        |
| `pgpool.adminUsername`                         | Pgpool Admin username                                                                                                                                                | `admin`                                                      |
| `pgpool.adminPassword`                         | Pgpool Admin password                                                                                                                                                | `nil`                                                        |
| `pgpool.maxPool`                               | The maximum number of cached connections in each child process                                                                                                       | `15`                                                          |
| `pgpool.numInitChildren`                       | The number of preforked Pgpool-II server processes.                                                                                                                  | `32`                                                          |
| `pgpool.configuration`                         | Content of pgpool.conf                                                                                                                                               | `nil`                                                        |
| `pgpool.configurationCM`                       | ConfigMap with the Pgpool configuration file (Note: Overrides `pgpol.configuration`)                                                                                 | `nil` (The value is evaluated as a template)                 |
| `pgpool.useLoadBalancing`                      | If true, use Pgpool Load-Balancing                                                                                                                                   | `true`                                                        |
| **LDAP**                                       |                                                                                                                                                                      |                                                              |
| `ldap.enabled`                                 | Enable LDAP support                                                                                                                                                  | `false`                                                      |
| `ldap.existingSecret`                          | Name of existing secret to use for LDAP passwords                                                                                                                    | `nil`                                                        |
| `ldap.uri`                                     | LDAP URL beginning in the form `ldap[s]://<hostname>:<port>`                                                                                                         | `nil`                                                        |
| `ldap.base`                                    | LDAP base DN                                                                                                                                                         | `nil`                                                        |
| `ldap.binddn`                                  | LDAP bind DN                                                                                                                                                         | `nil`                                                        |
| `ldap.bindpw`                                  | LDAP bind password                                                                                                                                                   | `nil`                                                        |
| `ldap.bslookup`                                | LDAP base lookup                                                                                                                                                     | `nil`                                                        |
| `ldap.scope`                                   | LDAP search scope                                                                                                                                                    | `nil`                                                        |
| `ldap.tlsReqcert`                              | LDAP TLS check on server certificates                                                                                                                                | `nil`                                                        |
| `ldap.nssInitgroupsIgnoreusers`                | LDAP ignored users                                                                                                                                                   | `root,nslcd`                                                 |
| **Prometheus metrics**                         |                                                                                                                                                                      |                                                              |
| `metricsImage.registry`                        | Registry for PostgreSQL Prometheus exporter                                                                                                                          | `docker.io`                                                  |
| `metricsImage.repository`                      | Repository for PostgreSQL Prometheus exporter                                                                                                                        | `bitnami/postgres-exporter`                                  |
| `metricsImage.tag`                             | Tag for PostgreSQL Prometheus exporter                                                                                                                               | `{TAG_NAME}`                                                 |
| `metricsImage.pullPolicy`                      | PostgreSQL Prometheus exporter image pull policy                                                                                                                     | `IfNotPresent`                                               |
| `metricsImage.pullSecrets`                     | Specify docker-registry secret names as an array                                                                                                                     | `[]` (does not add image pull secrets to deployed pods)      |
| `metricsImage.debug`                           | Specify if debug logs should be enabled                                                                                                                              | `false`                                                      |
| `metrics.securityContext.enabled`              | Enable security context for PostgreSQL Prometheus exporter                                                                                                           | `true`                                                       |
| `metrics.securityContext.runAsUser`            | User ID for the PostgreSQL Prometheus exporter container                                                                                                             | `1001`                                                       |
| `metrics.resources`                            | The [resources] to allocate for container                                                                                                                            | `{}`                                                         |
| `metrics.livenessProbe`                        | Liveness probe configuration for PostgreSQL Prometheus exporter                                                                                                      | `Check values.yaml file`                                     |
| `metrics.readinessProbe`                       | Readiness probe configuration for PostgreSQL Prometheus exporter                                                                                                     | `Check values.yaml file`                                     |
| `metrics.annotations`                          | Annotations for PostgreSQL Prometheus exporter service                                                                                                               | `{prometheus.io/scrape: "true", prometheus.io/port: "9187"}` |
| `metrics.serviceMonitor.enabled`               | if `true`, creates a Prometheus Operator ServiceMonitor (also requires `metrics.enabled` to be `true`)                                                               | `false`                                                      |
| `metrics.serviceMonitor.namespace`             | Optional namespace which Prometheus is running in                                                                                                                    | `nil`                                                        |
| `metrics.serviceMonitor.interval`              | How frequently to scrape metrics (use by default, falling back to Prometheus' default)                                                                               | `nil`                                                        |
| `metrics.serviceMonitor.selector`              | Default to kube-prometheus install (CoreOS recommended), but should be set according to Prometheus install                                                           | `{prometheus: "kube-prometheus"}`                            |
| **Init Container to adapt volume permissions** |                                                                                                                                                                      |                                                              |
| `volumePermissionsImage.registry`              | Registry for Bitnami Minideb                                                                                                                                         | `docker.io`                                                  |
| `volumePermissionsImage.repository`            | Repository for Bitnami Minideb                                                                                                                                       | `bitnami/minideb`                                            |
| `volumePermissionsImage.tag`                   | Tag for Bitnami Minideb                                                                                                                                              | `latest`                                                     |
| `volumePermissionsImage.pullPolicy`            | Bitnami Minideb exporter image pull policy                                                                                                                           | `Always`                                                     |
| `volumePermissionsImage.pullSecrets`           | Specify docker-registry secret names as an array                                                                                                                     | `[]` (does not add image pull secrets to deployed pods)      |
| `volumePermissions.enabled`                    | Enable init container to adapt volume permissions                                                                                                                    | `false`                                                      |
| `volumePermissions.securityContext.enabled`    | Enable security context for Bitnami Minideb                                                                                                                          | `false`                                                      |
| `volumePermissions.securityContext.runAsUser`  | User ID for the Bitnami Minideb container                                                                                                                            | `0`                                                          |
| **Persistence**                                |                                                                                                                                                                      |                                                              |
| `persistence.enabled`                          | Enable data persistence                                                                                                                                              | `true`                                                       |
| `persistence.existingClaim`                    | Use a existing PVC which must be created manually before bound                                                                                                       | `nil`                                                        |
| `persistence.storageClass`                     | Specify the `storageClass` used to provision the volume                                                                                                              | `nil`                                                        |
| `persistence.mountPath`                        | Path to mount data volume at                                                                                                                                         | `nil`                                                        |
| `persistence.accessMode`                       | Access mode of data volume                                                                                                                                           | `ReadWriteOnce`                                              |
| `persistence.size`                             | Size of data volume                                                                                                                                                  | `8Gi`                                                        |
| `persistence.annotations`                      | Persistent Volume Claim annotations                                                                                                                                  | `{}`                                                         |
| **Expose**                                     |                                                                                                                                                                      |                                                              |
| `service.type`                                 | Kubernetes service type (`ClusterIP`, `NodePort` or `LoadBalancer`)                                                                                                  | `ClusterIP`                                                  |
| `service.port`                                 | PostgreSQL port                                                                                                                                                      | `5432`                                                       |
| `service.nodePort`                             | Kubernetes service nodePort                                                                                                                                          | `nil`                                                        |
| `service.annotations`                          | Annotations for PostgreSQL service                                                                                                                                   | `{}`                                                         |
| `service.loadBalancerIP`                       | loadBalancerIP if service type is `LoadBalancer`                                                                                                                     | `nil`                                                        |
| `service.loadBalancerSourceRanges`             | Address that are allowed when service is LoadBalancer                                                                                                                | `[]`                                                         |
| `service.clusterIP`                            | Static clusterIP or None for headless services                                                                                                                       | `nil`                                                        |
| `ingress.enabled`                              | Enable ingress controller resource                                                                                                                                   | `false`                                                      |
| `ingress.certManager`                          | Add annotations for cert-manager                                                                                                                                     | `false`                                                      |
| `ingress.annotations`                          | Ingress annotations                                                                                                                                                  | `[]`                                                         |
| `ingress.hosts[0].name`                        | Hostname for PostgreSQL service                                                                                                                                      | `postgresql.local`                                           |
| `ingress.hosts[0].path`                        | Path within the url structure                                                                                                                                        | `/`                                                          |
| `ingress.tls[0].hosts[0]`                      | TLS hosts                                                                                                                                                            | `postgresql.local`                                           |
| `ingress.tls[0].secretName`                    | TLS Secret (certificates)                                                                                                                                            | `postgresql.local-tls`                                       |
| `ingress.secrets[0].name`                      | TLS Secret Name                                                                                                                                                      | `nil`                                                        |
| `ingress.secrets[0].certificate`               | TLS Secret Certificate                                                                                                                                               | `nil`                                                        |
| `ingress.secrets[0].key`                       | TLS Secret Key                                                                                                                                                       | `nil`                                                        |
| `networkPolicy.enabled`                        | Enable NetworkPolicy                                                                                                                                                 | `false`                                                      |
| `networkPolicy.allowExternal`                  | Don't require client label for connections                                                                                                                           | `true`                                                       |

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

```console
$ helm install my-release \
    --set postgresql.password=password \
    bitnami/postgresql-ha
```

The above command sets the password for user `postgres` to `password`.

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/postgresql-ha
```

## 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.

### Production configuration and horizontal scaling

This chart includes a `values-production.yaml` file where you can find some parameters oriented to production configuration in comparison to the regular `values.yaml`:

- Enable Newtworkpolicy blocking external access:

```diff
- networkPolicy.enabled: false
+ networkPolicy.enabled: true
- networkPolicy.allowExternal: true
+ networkPolicy.allowExternal: false
```

- Start a side-car prometheus exporter:

```diff
- metrics.enabled: false
+ metrics.enabled: true
```

To horizontally scale this chart, you can use the `--replicaCount` flag to modify the number of nodes in your PostgreSQL deployment. Also you can use the `values-production.yaml` file or modify the parameters shown above.

### Change PostgreSQL version

To modify the PostgreSQL version used in this chart you can specify a [valid image tag](https://hub.docker.com/r/bitnami/postgresql/tags/) using the `image.tag` parameter. For example, `image.tag=12.0.0`

### Configure the way how to expose PostgreSQL

- **Ingress**: The ingress controller must be installed in the Kubernetes cluster. Set `ingress.enabled=true` to expose PostgreSQL through Ingress.
- **ClusterIP**: Exposes the service on a cluster-internal IP. Choosing this value makes the service only reachable from within the cluster. Set `service.type=ClusterIP` to choose this service type.
- **NodePort**: Exposes the service on each Node's IP at a static port (the NodePort). You’ll be able to contact the NodePort service, from outside the cluster, by requesting `NodeIP:NodePort`. Set `service.type=NodePort` to choose this service type.
- **LoadBalancer**: Exposes the service externally using a cloud provider's load balancer. Set `service.type=LoadBalancer` to choose this service type.

### Adjust permissions of persistent volume mountpoint

As the images run as non-root by default, it is necessary to adjust the ownership of the persistent volumes so that the containers can write data into it.

By default, the chart is configured to use Kubernetes Security Context to automatically change the ownership of the volume. However, this feature does not work in all Kubernetes distributions.
As an alternative, this chart supports using an initContainer to change the ownership of the volume before mounting it in the final destination.

You can enable this initContainer by setting `volumePermissions.enabled` to `true`.

### LDAP

LDAP support can be enabled in the chart by specifying the `ldap.` parameters while creating a release. The following parameters should be configured to properly enable the LDAP support in the chart.

- **ldap.enabled**: Enable LDAP support. Defaults to `false`.
- **ldap.uri**: LDAP URL beginning in the form `ldap[s]://<hostname>:<port>`. No defaults.
- **ldap.base**: LDAP base DN. No defaults.
- **ldap.binddn**: LDAP bind DN. No defaults.
- **ldap.bindpw**: LDAP bind password. No defaults.
- **ldap.bslookup**: LDAP base lookup. No defaults.
- **ldap.nss_initgroups_ignoreusers**: LDAP ignored users. `root,nslcd`.
- **ldap.scope**: LDAP search scope. No defaults.
- **ldap.tls_reqcert**: LDAP TLS check on server certificates. No defaults.

For example:

```bash
ldap.enabled="true"
ldap.uri="ldap://my_ldap_server"
ldap.base="dc=example\,dc=org"
ldap.binddn="cn=admin\,dc=example\,dc=org"
ldap.bindpw="admin"
ldap.bslookup="ou=group-ok\,dc=example\,dc=org"
ldap.nss_initgroups_ignoreusers="root\,nslcd"
ldap.scope="sub"
ldap.tls_reqcert="demand"
```

Next, login to the PostgreSQL server using the `psql` client and add the PAM authenticated LDAP users.

> Note: Parameters including commas must be escaped as shown in the above example. More information at: https://github.com/helm/helm/blob/master/docs/using_helm.md#the-format-and-limitations-of---set

### repmgr.conf / postgresql.conf / pg_hba.conf / pgpool.conf files as configMap

This helm chart also supports to customize the whole configuration file.

Add your custom files to "files" in your working directory. Those files will be mounted as configMap to the containers and it will be used for configuring Pgpool, Repmgr and the PostgreSQL server.

Alternatively, you can specify the Pgpool, PostgreSQL and Repmgr configuration using the `pgpool.configuration`, `postgresql.configuration`, `postgresql.pgHbaConfiguration`, and `postgresql.repmgrConfiguration` parameters.

In addition to these options, you can also set an external ConfigMap(s) with all the configuration files. This is done by setting the `postgresql.configurationCM` and `pgpool.configurationCM` parameters. Note that this will override the two previous options.

### Allow settings to be loaded from files other than the default `postgresql.conf`

If you don't want to provide the whole PostgreSQL configuration file and only specify certain parameters, you can add your extended `.conf` files to "files/conf.d/" in your working directory.
Those files will be mounted as configMap to the containers adding/overwriting the default configuration using the `include_dir` directive that allows settings to be loaded from files other than the default `postgresql.conf`.

Alternatively, you can specify the extended configuration using the `postgresql.extendedConf` parameter.

In addition to these options, you can also set an external ConfigMap with all the extra configuration files. This is done by setting the `postgresql.extendedConfCM` parameter. Note that this will override the two previous options.

### Initialize a fresh instance

The [Bitnami PostgreSQL with Repmgr](https://github.com/bitnami/bitnami-docker-postgresql-repmgr) image allows you to use your custom scripts to initialize a fresh instance. In order to execute the scripts, they must be located inside the chart folder `files/docker-entrypoint-initdb.d` so they can be consumed as a ConfigMap.

Alternatively, you can specify custom scripts using the `initdbScripts` parameter as dict.

In addition to these options, you can also set an external ConfigMap with all the initialization scripts. This is done by setting the `postgresql.initdbScriptsCM` parameter. Note that this will override the two previous options. If your initialization scripts contain sensitive information such as credentials or passwords, you can use the `initdbScriptsSecret` parameter.

The allowed extensions are `.sh`, `.sql` and `.sql.gz`.

### Use of global variables

In more complex scenarios, we may have the following tree of dependencies

```bash
                     +--------------+
                     |              |
        +------------+   Chart 1    +-----------+
        |            |              |           |
        |            --------+------+           |
        |                    |                  |
        |                    |                  |
        |                    |                  |
        |                    |                  |
        v                    v                  v
+-------+------+    +--------+------+  +--------+------+
|              |    |               |  |               |
|PostgreSQL HA |    |  Sub-chart 1  |  |  Sub-chart 2  |
|              |    |               |  |               |
+--------------+    +---------------+  +---------------+
```

The three charts below depend on the parent chart Chart 1. However, subcharts 1 and 2 may need to connect to PostgreSQL HA as well. In order to do so, subcharts 1 and 2 need to know the PostgreSQL HA credentials, so one option for deploying could be deploy Chart 1 with the following parameters:

```bash
postgresql.postgresqlPassword=testtest
subchart1.postgresql.postgresqlPassword=testtest
subchart2.postgresql.postgresqlPassword=testtest
postgresql.postgresqlDatabase=db1
subchart1.postgresql.postgresqlDatabase=db1
subchart2.postgresql.postgresqlDatabase=db1
```

If the number of dependent sub-charts increases, installing the chart with parameters can become increasingly difficult. An alternative would be to set the credentials using global variables as follows:

```bash
global.postgresql.postgresqlPassword=testtest
global.postgresql.postgresqlDatabase=db1
```

This way, the credentials will be available in all of the subcharts.

## Persistence

The data is persisted by default using PVC templates in the PostgreSQL statefulset. You can disable the persistence setting the `persistence.enabled` parameter to `false`.
A default `StorageClass` is needed in the Kubernetes cluster to dynamically provision the volumes. Specify another StorageClass in the `persistence.storageClass` or set `persistence.existingClaim` if you have already existing persistent volumes to use.

## Upgrade

It's necessary to specify the existing passwords while performing a upgrade to ensure the secrets are not updated with invalid randomly generated passwords. Remember to specify the existing values of the `postgresql.password` and `postgresql.repmgrPassword` parameters when upgrading the chart:

```bash
$ helm upgrade my-release bitnami/postgresql-ha \
    --set postgresql.password=[POSTGRESQL_PASSWORD] \
    --set postgresql.repmgrPassword=[REPMGR_PASSWORD]
```

> Note: you need to substitute the placeholders _[POSTGRESQL_PASSWORD]_, and _[REPMGR_PASSWORD]_ with the values obtained from instructions in the installation notes.

## 3.0.0

A new major version of repmgr (5.1.0) was included. To upgrade to this major version, it's necessary to upgrade the repmgr extension installed on the database. To do so, follow the steps below:

- Reduce your PostgreSQL setup to one replica (primary node) and upgrade to `3.0.0`, enabling the repmgr extension upgrade:

```bash
$ helm upgrade my-release --version 3.0.0 bitnami/postgresql-ha \
    --set postgresql.password=[POSTGRESQL_PASSWORD] \
    --set postgresql.repmgrPassword=[REPMGR_PASSWORD] \
    --set postgresql.replicaCount=1 \
    --set postgresql.upgradeRepmgrExtension=true
```

- Scale your PostgreSQL setup to the original number of replicas:

```bash
$ helm upgrade my-release --version 3.0.0 bitnami/postgresql-ha \
    --set postgresql.password=[POSTGRESQL_PASSWORD] \
    --set postgresql.repmgrPassword=[REPMGR_PASSWORD] \
    --set postgresql.replicaCount=[NUMBER_OF_REPLICAS]
```

> Note: you need to substitute the placeholders _[POSTGRESQL_PASSWORD]_, and _[REPMGR_PASSWORD]_ with the values obtained from instructions in the installation notes.

## 2.0.0

The [Bitnami Pgpool](https://github.com/bitnami/bitnami-docker-pgpool) image was migrated to a "non-root" user approach. Previously the container ran as the `root` user and the Pgpool daemon was started as the `pgpool` user. From now on, both the container and the Pgpool daemon run as user `1001`. You can revert this behavior by setting the parameters `pgpool.securityContext.runAsUser`, and `pgpool.securityContext.fsGroup` to `0`.

Consequences:

- No backwards compatibility issues are expected since all the data is at PostgreSQL pods, and Pgpool uses a deployment without persistence. Therefore, upgrades should work smoothly from `1.x.x` versions.
- Environment variables related to LDAP configuration were renamed removing the `PGPOOL_` prefix. For instance, to indicate the LDAP URI to use, you must set `LDAP_URI` instead of `PGPOOL_LDAP_URI`

## 1.0.0

A new major version of repmgr (5.0.0) was included. To upgrade to this major version, it's necessary to upgrade the repmgr extension installed on the database. To do so, follow the steps below:

- Reduce your PostgreSQL setup to one replica (primary node) and upgrade to `1.0.0`, enabling the repmgr extension upgrade:

```bash
$ helm upgrade my-release --version 1.0.0 bitnami/postgresql-ha \
    --set postgresql.password=[POSTGRESQL_PASSWORD] \
    --set postgresql.repmgrPassword=[REPMGR_PASSWORD] \
    --set postgresql.replicaCount=1 \
    --set postgresql.upgradeRepmgrExtension=true
```

- Scale your PostgreSQL setup to the original number of replicas:

```bash
$ helm upgrade my-release --version 1.0.0 bitnami/postgresql-ha \
    --set postgresql.password=[POSTGRESQL_PASSWORD] \
    --set postgresql.repmgrPassword=[REPMGR_PASSWORD] \
    --set postgresql.replicaCount=[NUMBER_OF_REPLICAS]
```

> Note: you need to substitute the placeholders _[POSTGRESQL_PASSWORD]_, and _[REPMGR_PASSWORD]_ with the values obtained from instructions in the installation notes.

## 0.4.0

In this version, the chart will use PostgreSQL-Repmgr container images with the Postgis extension included. The version used in Postgresql version 10, 11 and 12 is Postgis 2.5, and in Postgresql 9.6 is Postgis 2.3. Postgis has been compiled with the following dependencies:

- protobuf
- protobuf-c
- json-c
- geos
- proj
- gdal
