I'm new to Kubernetes and learning it. have deployment kind of pods and replcas=3.
Is there any way I can mount separate volume for each pod and one volume for all pods. Requirements:
case 1- My application that is generating some temp file name tempfile.txt, So there is three replica pod, each one will generate tempfile.txt but content might be different. So If I use shared volume that will override each other .
case-2: I have a common file that is not part of image, that will be used by all pods starting the application i.e copy files from host to all pods's container
Thanks in Advance.
There are multiple ways to achieve the first part. Here is mine:
Instead of a deployment, use a statefulSet to create the replicas. statefulSets allow you to include a volume template which each pod have created with it, thus each new pod will have a new PV created specificlaly for it.
This does require your cluster to allow for dynamically provisioned volumes.
Depending on the size of your tempfile.txt, your use case, and your cluster/node configuration, you might also want to consider using a hostPath volume which will use the local storage of your node.
For the second part of your question, using any readWriteMany volume will work (such as any NFS option).
On the note of subPath, this should also work, so long as you define different subPaths for each pod. the example in the link provided by DT does this by creating a subpath based off the pod name.