<p>How do multiple containers(create from same image) access the directory(packaged in the image) in other container? There are some ways not elegant:</p>
<ol>
<li>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?</li>
<li>Create a volume for each container, and copy directory into the volume. In this way, the directory have to save multiple copies in disk.</li>
</ol>
<p>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?</p>

Gomo
<p>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 <a href="https://docs.docker.com/storage/volumes/" rel="nofollow noreferrer">volume mount or bind mount</a>. Alternatively you could try to perform some NFS/SMB/... mount of shared storage inside the container.</p>
<p>This is completely independent from running a container in host mode.</p>
