MediaWiki on Kubernetes

We will provide a MediaWiki platform with the following characteristics:

• self-healing infrastructure
• auto-scaling
• high-availability with multi-server failover
• flexible storage backends
• multi-cloud compatibility

To do so, we'll need to implement Kubernetes.

We will almost certainly leverage Ansible as an orchestration tool. In a recent blog post on ansible.com, Jeff Geerling (@geerlingguy) answers the question: "How Useful is Ansible in a Cloud-native Kubernetes Environment? The short answer is that Ansible can be used for:

1. Container Build (Ansible-bender)
2. Cluster Management (Kubespray)
3. Application Lifecycle (Use Ansible to build Operators with the Operator SDK to handle deployment, upgrades, backups, etc.)

High-level outline

1. Build image. The WMF official images at Docker Hub do not even include a true database; never mind the extensions we need.
   1. With ansible-bender we can use ansible-playbook + buildah to create our image.
2. Publish images to Docker Hub
   1. Create organization account at Docker Hub; add freephile
   2. Create service account at GitHub - to prevent access to private repos through Docker Hub
   3. Add automated builds and automated testing

Docker (default in kublet ) is just one of many container runtimes that can be used with Kubernetes. The others include containerd and CRI-O.