The VOLUME command will mount a directory inside your container and store any files created or edited inside that directory on your hosts disk outside the container file structure, bypassing the union file system. The idea is that your volumes can be shared between your docker containers and they will stay around as long as … Read more
UPDATE: Things have changed in the last years. Please refer to the answer from @Frederik Wendt for a good and up-to-date solution. My old answer: Exactly how to do it depends a little on what image you are using for your data-only-container. If your image has an entrypoint, you need to overwrite this in your … Read more
When you run a container and mount a volume from the host, all you see in the container is what is on the host – the volume mount points at the host directory, so if there was anything in the directory in the image it gets bypassed. With an image from this Dockerfile: FROM ubuntu WORKDIR /vol … Read more
To clone docker volumes, you can transfer your files from one volume to another one. For that you have to manually create a new volume and then spin up a container to copy the contents. Someone has already made a script for that, which you might use: https://github.com/gdiepen/docker-convenience-scripts/blob/master/docker_clone_volume.sh If not, use the following commands (taken … Read more
You could try to create (in the Dockerfile of a custom image) a user and set it as the one used by the container RUN adduser –system –group –shell /bin/sh auser \ && mkdir /home/auser/bin USER auser Then check if a docker run -v /home/matt/build:/build build-rpm mounts the shared folder in /build as auser. Another … Read more
docker-compose down -v removes all volumes attached. See the docs
The VOLUME command will mount a directory inside your container and store any files created or edited inside that directory on your hosts disk outside the container file structure, bypassing the union file system. The idea is that your volumes can be shared between your docker containers and they will stay around as long as … Read more
Given volumes: – /dir/on/host:/var/www/html if /dir/on/host doesn’t exist, it is created on the host and the empty content is mounted in the container at /var/www/html. Whatever content you had before in /var/www/html inside the container is inaccessible, until you unmount the volume; the new mount is hiding the old content.