How do multiple containers(create from same image) access the directory(packaged in the image) in other container? There are some ways not elegant:

1. Mount directory into a shared volume or host path. When a container changed files in the directory, other containers will perceive it. Is there any idea to make shared volume working like copy-on-write?
2. Create a volume for each container, and copy directory into the volume. In this way, the directory have to save multiple copies in disk.

I've browsed this problem [https://stackoverflow.com/questions/29550736/can-i-mount-docker-host-directory-as-copy-on-write-overlay], I don't want containers to run in privileged mode. Is there a better idea?

CodePudding user response：

Per design one container cannot access the files inside another container. You will need to store the data outside of a container, then mount it via volume mount or bind mount. Alternatively you could try to perform some NFS/SMB/... mount of shared storage inside the container.

This is completely independent from running a container in host mode.

CodePudding user response：

Your link in the question already addressed docker very well. Here's the official K8s document for the similar capability by setting the pod attribute shareProcessNamespace: true and securityContext.capabilities.add: ["SYS_PTRACE"].