Kustomize

Installing PGO Using Kustomize

This section provides instructions for installing and configuring PGO using Kustomize.

If you are deploying using the installer from the Crunchy Data Customer Portal, please refer to the guide there for alternative setup information.

Prerequisites

First, go to GitHub and fork the Postgres Operator examples repository, which contains the PGO Kustomize installer.

https://github.com/CrunchyData/postgres-operator-examples/fork

Once you have forked this repo, you can download it to your working environment with a command similar to this:

YOUR_GITHUB_UN="<your GitHub username>"
git clone --depth 1 "git@github.com:${YOUR_GITHUB_UN}/postgres-operator-examples.git"
cd postgres-operator-examples

The PGO installation project is located in the kustomize/install directory.

Configuration

While the default Kustomize install should work in most Kubernetes environments, it may be necessary to further customize the Kustomize project(s) according to your specific needs.

For instance, to customize the image tags utilized for the PGO Deployment, the images setting in the kustomize/install/default/kustomization.yaml file can be modified:

images:
- name: postgres-operator
  newName: registry.developers.crunchydata.com/crunchydata/postgres-operator
  newTag: ubi8-5.3.0-0

If you are deploying using the images from the Crunchy Data Customer Portal, please refer to the private registries guide for additional setup information.

Please note that the Kustomize install project will also create a namespace for PGO by default (though it is possible to install without creating the namespace, as shown below). To modify the name of namespace created by the installer, the kustomize/install/namespace/namespace.yaml should be modified:

apiVersion: v1
kind: Namespace
metadata:
  name: custom-namespace

The namespace setting in kustomize/install/default/kustomization.yaml should be modified accordingly.

namespace: custom-namespace

By default, PGO deploys with debug logging turned on. If you wish to disable this, you need to set the CRUNCHY_DEBUG environmental variable to "false" that is found in the kustomize/install/manager/manager.yaml file. Alternatively, you can add the following to your kustomize/install/manager/kustomization.yaml to disable debug logging:

patchesStrategicMerge:
- |-
  apiVersion: apps/v1
  kind: Deployment
  metadata:
    name: pgo
  spec:
    template:
      spec:
        containers:
        - name: operator
          env:
          - name: CRUNCHY_DEBUG
            value: "false"

You can also create additional Kustomize overlays to further patch and customize the installation according to your specific needs.

Installation Mode

When PGO is installed, it can be configured to manage PostgreSQL clusters in all namespaces within the Kubernetes cluster, or just those within a single namespace. When managing PostgreSQL clusters in all namespaces, a ClusterRole and ClusterRoleBinding is created to ensure PGO has the permissions it requires to properly manage PostgreSQL clusters across all namespaces. However, when PGO is configured to manage PostgreSQL clusters within a single namespace only, a Role and RoleBinding is created instead.

The installation of the necessary resources for a cluster-wide or a namespace-limited operator is done automatically by Kustomize, as described below in the Install section. The only potential change you may need to make is to the Namespace resource and the namespace field if using a namespace other than the default postgres-operator.

Install

Once the Kustomize project has been modified according to your specific needs, PGO can then be installed using kubectl and Kustomize. To create the target namespace, run the following:

kubectl apply -k kustomize/install/namespace

This will create the default postgres-operator namespace, unless you have edited the kustomize/install/namespace/namespace.yaml resource. That Namespace resource should have the same value as the namespace field in the kustomization.yaml file (located either at kustomize/install/default or kustomize/install/singlenamespace, depending on whether you are deploying the operator with cluster-wide or namespace-limited permissions).

To install PGO itself in cluster-wide mode, apply the kustomization file in the default folder:

kubectl apply --server-side -k kustomize/install/default

To install PGO itself in namespace-limited mode, apply the kustomization file in the singlenamespace folder:

kubectl apply --server-side -k kustomize/install/singlenamespace

The kustomization.yaml files in those folders take care of applying the appropriate permissions.

Automated Upgrade Checks

By default, PGO will automatically check for updates to itself and software components by making a request to a URL. If PGO detects there are updates available, it will print them in the logs. As part of the check, PGO will send aggregated, anonymized information about the current deployment to the endpoint. An upcoming release will allow for PGO to opt-in to receive and apply updates to software components automatically.

PGO will check for updates upon startup and once every 24 hours. Any errors in checking will have no impact on PGO’s operation. To disable the upgrade check, you can set the CHECK_FOR_UPGRADES environmental variable on the pgo Deployment to "false".

For more information about collected data, see the Crunchy Data collection notice.

Uninstall

Once PGO has been installed, it can also be uninstalled using kubectl and Kustomize. To uninstall PGO (assuming it was installed in cluster-wide mode), the following command can be utilized:

kubectl delete -k kustomize/install/default

To uninstall PGO installed with only namespace permissions, use:

kubectl delete -k kustomize/install/singlenamespace

The namespace created with this installation can likewise be cleaned up with:

kubectl delete -k kustomize/install/namespace