I am working with kubernetes for a long time and I have a question that I am not sure what the answer is.
If I create a PersistentVolume and couple of PersistentVolumeClaims that uses that PersistentVolume.
I mapped different PersistentVolumeClaims to different pods/containers.
Is There a way that one pod could read data that the other pod/container written?
TL;DR: By mistake - no. By a chain of mistakes - yes.
First, PV Access Mode need to be set to ReadWriteMany.
Then, a specific Volume Plugin have to be used. While Kuberentes supports a lot of different volumes, only few support ReadWriteMany Access Mode.
Those volume types that do support ReadWriteMany can be found in this table (scroll down a bit).
As far as a container is concerned, PersistentVolume is just a volume mounted in container's filesystem. If you mount it to multiple pods, they will be able to read and write to the same files.