Install Mattermost on Kubernetes

This is from

but with more detail on what you're doing and why.

License file

First, create a license manifest. This is a requirement of Mattermost.

Save this as `mattermost-license.yaml`:

---
apiVersion: v1
kind: Secret
metadata:
  name: mattermost-license
type: Opaque
stringData:
  license: "this_is_my_install"

The `license` string can be anything. Were you performing an install with paid support, this file is significant, but for the self-supported install it's just a formality.

Installation manifest file

Create an installation manifest:

---
apiVersion: installation.mattermost.com/v1beta1
kind: Mattermost
metadata:
  name: mattermost-install
spec:
  size: 99users
  ingressName: mattermost
  ingressAnnotations:
    kubernetes.io/ingress.class: nginx
  version: 5.31.0
  licenseSecret: "mattermost-license"

This applies the metadata of `name` with the value `mattermost-install`, and refers back, by `name`, to the license file (`mattermost-license`) you created.