Docker, mount volumes as readonly
I am working with Docker,and I want to mount a dyanmic folder that changes a lot (so I do not have to make dockers for each ones execution, which would be too costly), but I want that folder to be readonly. Changing the folder owners to someone else works however
root access, which I would not prefer to expose to an application.
When I use
-v flag to mount, it gives whatever the username I give, I created a non root user inside the docker image, however all the files in the volume with the owner as the user that ran docker, changes into the user I give from commandline, so I cannot make readonly files and folders. How can I prevent this?
I also added
mustafa ALL=(docker) NOPASSWD: /usr/bin/docker, so I could change to another user via terminal, but still the files have permissions for my user.
One Solution collect form web for “Docker, mount volumes as readonly”
You can specify that a volume should be read-only by appending
:ro to the
docker run -v /path/on/host:/path/on/container:ro my/image
Note that the folder is then read-only in the container and read-write on the host.