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PostgreSQL Database Operators

There are a number of PostgreSQL database Kubernetes operators available—including Crunchy PostgreSQL for KubernetesZalando PostgreSQL Operator, and Percona Distribution for PostgreSQL on Kubernetes to name just a few—however, for this blog post, I will be taking the popular EnterpriseDB (EDB) PostgreSQL Operator out for a spin.

If you want to try looking at using other database operators, visit OperatorHub.io, which provides a registry of Kubernetes operators.

Before we start, let’s take a quick look at my Kubernetes environment:

Kubectl

Install Cloud Native PostgreSQL

To begin, let’s install the latest Cloud Native PostgreSQL operator:

Kubectl-1

Next, let’s confirm the Operator installation:

Kubectl-2

Create Portworx Storage Class

Use a text editor to create a file, in the example below I have set the replication factor to 2, io profile for database workloads, and asked Portworx to support volume expansions.

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: px-postgresql-sc
provisioner: kubernetes.io/portworx-volume
parameters:
  repl: "2"
  io_profile: "db_remote"
allowVolumeExpansion: true

Next, create a Kubernetes storage class; you can use kubectl apply, for example.

Kubectl-3

Deploy PostgreSQL Cluster

Create a file named “px-postgresql-cluster.yaml”:

Kubectl-4

Next, use kubectl to create a 3-node PostgreSQL cluster:

kubectl apply -f px-postgresql-cluster.yaml

Then, check the PostgreSQL pod status:

Kubectl-5

Next, check the Portworx PersistentVolumeClaims:

Kubectl-6

Finally, check the PostgreSQL cluster status:

Kubectl-10

If you want additional details, you can obtain them with kubectl get cluster -o json.

Next, we want to get the cluster name:

Kubectl-7

Then, we want to get the cluster description:

Kubectl-8

The next step is to get the cluster current primary:

Kubectl-9

And finally, we want to get the cluster status:

Kubectl-11

Cloud Native PostgreSQL Plugin

EnterpriseDB provides a plugin for kubectl to manage a PostgreSQL cluster in Kubernetes. We can install this with:

Kubectl-12

The cnp extension provides some additional features to kubectl:

Kubectl-13

Checking the Cloud Native PostgreSQL Status

CNP shows we are running two replicas; if the primary fails for any reason, the cluster will failover to one of them.

Kubectl-14

Summary

In this post, I have shared how we can deploy a PostgreSQL database on Kubernetes using the EDB PostgreSQL operator and provide additional resilience using Portworx persistent storage.

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ron_ekins_

Ron Ekins

Principal Field Solutions Architect
Explore Related Content:
  • databases
  • kubernetes
  • portworx
  • postgresql
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