Setup Example Kubernetes Storage and Ensure Proper Mount Permissions

[njriasan]

Kubernetes default doesn't have a volume mounted and the database container may not have the necessary permissions to use it.

[shankari]

@njriasan can you clarify this a bit more? do you mean docker containers spawned by kubernetes? kubernetes is container management software, not containerization technology, so it won't manage volumes directly, will it?

[njriasan]

My understanding is that you can specify volume creations in the description for pod. It also lets you specify container permissions by associating each docker container with a security group. My understanding is that in addition to adding the volume though you also need to go through a step to ensure your container can properly access the volumes. What I read suggests that containers have user permissions and volumes mount with root:root. There may also be a permissions issue with enabling mount on this volume.

My understanding, based on this stack overflow post, is this requires 3 changes: make the dockefile creates a new usergroup for the container, add the mounted volume, and modify it to add permissions to that user group so mount succeeds.

I may also need to modify the Kubernetes implementation to use deployment files in addition to service and pod files, but I haven't fully investigated that.