Docker mount volumes as readonly

Question

I have a dynamic folder that keeps changing a lot. I want this folder to be readonly and I’m trying to avoid changing the ownership.

Is there any other way?

Answer 1

You can specify that a volume should be read-only by appending :ro to the -v switch:

docker run -v volume-name:/path/in/container:ro my/image

or 

use –mount switch

$ docker run --mount source=volume-name,destination=/path/in/container,readonly my/image