PMM on kubernetes with rootfull image [Technical Preview]

User story:

As the user I would like to be able to run PMM on k8s.

During PMM-9466 investigation it was concluded that we need at least couple of phases to deliver deployment of PMM on k8s. This is Phase 1 to limit the scope to the rootfull image and make it work on k8s.

UI/UX:

No changes to UI required.

Acceptance criteria:

PMM could be deployed (and upgraded) on k8s with one command.

Upgrade button on UI is always disabled.

Helm chart with following parameters

• Image
• How to expose
  • ClusterIP, NodePort, e.t.c.
• Resources
  • Limits/Requests
• Admin password
• Currently existed environment variables

Good to have, but not mandatory

• Support change of admin password via env variable

Out of scope:

Rootless image. Openshift. See PMM-3019

Node metrics for PMM Server.

Suggested implementation:

Empty /srv due to fresh mounted volume

• Init container, just copy files: 16 sec to start
• maybe pmm-init script as interface to init the volume
• we already have ansible job that runs always, so we can create needed dir structure there

How to test:

Test at least on GKE, EKS and minikube.

PMM should be able to monitor services inside k8s it is running as well as outside of it. 

Details:

https://docs.google.com/document/d/16Y5K6BwMVfj_WYyVgBSnNGM9o5dEE03HCTRLqH0uyZ4/edit#

PMM-9466