wp-k8s

WordPress implementation on Kubernetes. Based on the tutorial from Kubernetes' documentation, but on real cluster (no Minikube).

Simplest as possible, to be useful as Kubernetes cluster deployment exercise/test.

Preface

WordPress + MySQL configurations require the creation of a cluster with PersistentVolumes and Secrets. I'm also using Kustomize for the Secret generator.

1. Security first

Following the tutorial, the first step is adding a Secrets generator using a kustomization file.

I generated a random password for MySQL: GA3DIMJRGUZTSNZT. For learning purposes, such values are exposed, but this should never be a practice (neither in practice environments).

The following code must be added to kustomization.yaml:

#kustomization.yaml
secretGenerator:
- name: mysql-pass
  literals:
  - password=GA3DIMJRGUZTSNZT #arbitrarily random password

2. MySQL 🐬 deployment

This MySQL container image is specifically configured for WordPress usage, which makes connections easier. It also mounts the PersistentVolume at /var/lib/mysql. The MYSQL_ROOT_PASSWORD environment variable sets the database password from the Secret.

It also contains a Service and a Deployment, where further data is declared.

3. WordPress 🅦 settings

The WordPress container mounts the PersistentVolume at /var/www/html for website data files. The WORDPRESS_DB_HOST environment variable sets the name of the MySQL Service defined above, and WordPress will access the database by Service. The WORDPRESS_DB_PASSWORD environment variable sets the database password from the Secret kustomize generated.

4. Back to Kustomization

After defining both mysql.yaml and wordpress.yaml files, those should be referenced on kustomization.yaml: