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Prerequisites

Prerequisites

The following is required prior to installing Crunchy PostgreSQL Operator using Ansible:

Kubernetes Installs

  • Kubernetes v1.11+
  • Cluster admin privileges in Kubernetes
  • kubectl configured to communicate with Kubernetes

OpenShift Installs

  • OpenShift v3.09+
  • Cluster admin privileges in OpenShift
  • oc configured to communicate with OpenShift

Installing from a Windows Host

If the Crunchy PostgreSQL Operator is being installed from a Windows host the following are required:

Permissions

The installation of the Crunchy PostgreSQL Operator requires elevated privileges, as the following objects need to be created:

  • Custom Resource Definitions
  • Cluster RBAC for using one of the multi-namespace modes
  • Create required namespaces

In Kubernetes versions prior to 1.12 (including Openshift up through 3.11), there is a limitation that requires an extra step during installation for the operator to function properly with watched namespaces. This limitation does not exist when using Kubernetes 1.12+. When a list of namespaces are provided through the NAMESPACE environment variable, the setupnamespaces.sh script handles the limitation properly in both the bash and ansible installation.

However, if the user wishes to add a new watched namespace after installation, where the user would normally use pgo create namespace to add the new namespace, they should instead run the add-targeted-namespace.sh script or they may give themselves cluster-admin privileges instead of having to run setupnamespaces.sh script. Again, this is only required when running on a Kubernetes distribution whose version is below 1.12. In Kubernetes version 1.12+ the pgo create namespace command works as expected.

Obtaining Operator Ansible Role

GitHub Installation

All necessary files (inventory.yaml, values.yaml, main playbook and roles) can be found in the installers/ansible directory in the source code.

Configuring the Inventory File

The inventory.yaml file included with the PostgreSQL Operator Playbooks allows installers to configure how Ansible will connect to your Kubernetes cluster. This file should contain the following connection variables:

You will have to uncomment out either the kubernetes or openshift variables if you are being using them for your environment. Both sets of variables cannot be used at the same time. The unused variables should be left commented out or removed.
Name Default Required Description
kubernetes_context Required, if deploying to Kubernetes When deploying to Kubernetes, set to configure the context name of the kubeconfig to be used for authentication.
openshift_host Required, if deploying to OpenShift When deploying to OpenShift, set to configure the hostname of the OpenShift cluster to connect to.
openshift_password Required, if deploying to OpenShift When deploying to OpenShift, set to configure the password used for login.
openshift_skip_tls_verify Required, if deploying to OpenShift When deploying to Openshift, set to ignore the integrity of TLS certificates for the OpenShift cluster.
openshift_token Required, if deploying to OpenShift When deploying to OpenShift, set to configure the token used for login (when not using username/password authentication).
openshift_user Required, if deploying to OpenShift When deploying to OpenShift, set to configure the username used for login.

To retrieve the kubernetes_context value for Kubernetes installs, run the following command:

kubectl config current-context

Configuring - values.yaml

The values.yaml file contains all of the configuration parameters for deploying the PostgreSQL Operator. The example file contains defaults that should work in most Kubernetes environments, but it may require some customization.

For a detailed description of each configuration parameter, please read the PostgreSQL Operator Installer Configuration Reference