Research adding limit to ephemeral storage

[StevenBarre]

Describe the issue https://kubernetes.io/blog/2022/09/19/local-storage-capacity-isolation-ga/ Look into how to prevent emptyDir from going wild

What is the Value/Impact? Improved cluster stability

What is the plan? How will this get completed? Review docs Make a plan to do it in prod

Identify any dependencies Platform Services PO

Definition of done Plan on how to move forward

[vivekratan88]

some extra notes:

https://docs.openshift.com/container-platform/4.15/storage/understanding-ephemeral-storage.html#storage-ephemeral-storage-manage_understanding-ephemeral-storage

[vivekratan88]

https://kubernetes.io/docs/concepts/storage/ephemeral-volumes/

[vivekratan88]

confirmed this is to be tested on entire namespace level so something like this should be used. apiVersion: v1 kind: LimitRange metadata: name: storage-limit-range spec: limits:

• default: ephemeral-storage: 10Gi defaultRequest: ephemeral-storage: 5Gi type: Container

Will get accurate one made for my testing.

[vivekratan88]

fixed it seems like container was closing quickly, hence added a bit of delay seems to have fixed the issue for now. apiVersion: v1 kind: Pod metadata: name: frontend namespace: be1c6b-test spec: containers:

• name: app image: nginx resources: requests: ephemeral-storage: "8Gi" limits: ephemeral-storage: "12Gi" volumeMounts:
  • name: ephemeral mountPath: "/tmp"
• name: log-aggregator image: busybox **command:
  • /bin/sh
  • -c
  • "while true; do sleep 1000; done"** resources: requests: ephemeral-storage: "2Gi" volumeMounts:
  • name: ephemeral mountPath: "/tmp" volumes:
  • name: ephemeral emptyDir: {} sizeLimit: 5Gi

[vivekratan88]

busybox fill container is crashing looping looking into that.