containerMode:Kubernetes. Use Empty dir

[DenisPalnitsky]

I wonder if there is a way to use emptyDir instead of provisioning volume for every workflow.
It seems that currently, the workflow runner relies on PVC however I cannot see the reason why it could not use emptyDir.

Provisioning storage is problematic in our case as we have spikes in workflow jobs that could spin up over a 1000 extra pods and provisioning storage for each of them becomes a performance bottleneck.

[DenisPalnitsky]

I think I find an answer after some digging. The runner and runner-workflow should use same volume because runner copies the scripts that will be executed by runner-workflow

[rteeling-evernorth]

This isn't possible. Emptydir volumes cannot be shared between separate pods, they are explicitly scoped to the lifecycle of a pod.

https://kubernetes.io/docs/concepts/storage/volumes/#emptydir