Mattermost-server: Implement NodeSelector for Mattermost operator

[jwilander]

If you're interested please comment here and come join our "Contributors" community channel on our daily build server, where you can discuss questions with community members and the Mattermost core team. For technical advice or questions, please join our "Developers" community channel.

New contributors please see our Developer's Guide.

---

Notes: Jira ticket

The Mattermost Operator is a Kubernetes operator that manages the lifecycle of a Mattermost installation.

Currently we have NodeSelector as a field in the type definition for a ClusterInstallation, however, this is not implemented to set mattermost to use a specific node.

See the field here https://github.com/mattermost/mattermost-operator/blob/master/pkg/apis/mattermost/v1alpha1/clusterinstallation_types.go#L46

For this ticket implement node selection for the Mattermost ClusterInstallation custom resource.

Read https://kubernetes.io/docs/concepts/configuration/assign-pod-node/ for more details on node selection.

[lpadgett]

I think this might be better left to someone else upon some investigation - I think I should learn more about Kubernetes first.

[jozuenoon]

I up for grabbing that :)

[jwilander]

Thanks @lpadgett and @jozuenoon