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The behavior is unintentional, but I don't think it's something we can change. Or do I have to pay attention to something? How is Docker different from a virtual machine? How is being used in ""? The same container that a developer builds and tests on a laptop can run at scale, in production, on VMs, bare metal, OpenStack clusters, public clouds and more. IMHO the documentation is stating that if you mount a container, and think you can copy extra files or changes to it -- those will be ignored because you really cannot do anything to the volume until the container is actually created. What is the gravitational force acting on a massless body? 468), Monitoring data quality with Bigeye(Ep. It makes it very difficult to get temporary scripts and source files into a build without bloating the image or exposing rsa keys. Perhaps this is a documentation issue then, because I think this works as I've come to expect it. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. What determines whether Schengen flights have passport control? VOLUME /user/.ssh RUN ssh-keyscan -t rsa github.com 2>&1 > /user/.ssh/known_hosts. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. to your account. From inside of a Docker container, how do I connect to the localhost of the machine? https://github.com/gdiepen/docker-convenience-scripts/blob/master/docker_clone_volume.sh, San Francisco? I believe the only other real functionality is that it creates a directory in the image in the event you DONT mount anything when starting a container. I thought that declaring volumes in dockerfile somehow preserves it contents created in the Dockerfile (actions BEFORE declaring VOLUME). 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. Find centralized, trusted content and collaborate around the technologies you use most. What is "Rosencrantz and Guildenstern" in _The Marvelous Mrs. Maisel_ season 3 episode 5? The important bit is that it automatically creates a volume outside of the image which can be persistent and hold data across upgrades, etc. Else docker-compose will throw something like Volume already exists but was not created by Docker Compose. More like San Francis-go (Ep. Making statements based on opinion; back them up with references or personal experience. In this form /myvol/greeting file exists. How to get a Docker container's IP address from the host, Docker: Copying files from Docker container to host. Thanks. (Yes i know i can create file, mount volume somewherhe else and copy the file there, but thats not the point). Additional information you deem important (e.g. IIRC volume and copy commands execute at different layers, since volumes exist outside the container they mounted outside everything else. Does anyone find the title of that issue to be any descriptive? reverse translation from amino acid string to DNA strings, At 3% inflation rate is $100 today worth $40 20 years ago. Development container with Visual Studio code - how does Mapping multiple docker networks to interface names Press J to jump to the feed. ", It's also worth noting that the changes ARE discarded if you only COPY|ADD a single file, @genei09 do you have an example? How to copy Docker images from one host to another without using a repository. results in /user/.ssh having only id_rsa in it while: RUN ssh-keyscan -t rsa github.com 2>&1 > /user/.ssh/known_hosts I mean, the same way this works even without VOLUME declaration in Dockerfile. If not, use the following commands (taken from the script): On Linux it can be as easy as copying a directory. Check with docker volume labs what volumes exists and with docker volume inspect you can detailed information about a volume like location. Dockerfile: VOLUME declaration before COPY or ADD of multiple files or whole directory adds to the image. COPY id_rsa /user/.ssh/, results in both files being in /user/.ssh/. Isn't the COPY command here working as specified and creating the folder structure correctly? What is the difference between the 'COPY' and 'ADD' commands in a Dockerfile? Is the expected behavior that any ADD, COPY, or RUN command should be ignored if a previous VOLUME command is performed? What is the (best) way to manage permissions for Docker shared volumes? I redid it with -p and everything worked fine! I'd swear I was able to get it to work at one point. Is there a name for this fallacy when someone says something is good by only pointing out the good things? Creating a directory in the image isnt quite right, the directories in the image exist whether theyre backed by volumes or not. The file is available during the build and then not present in the image. Is this as easy as doing cp -r volumeOld volumeNew? for me no copy or add (single file as well as folders) ever gets discarded, Same as you have above with: Docker run creates a volume which will reside in /var/lib/docker/volumes. In this scenario, since we aren't binding anything to this path it appears to just pass through to what was written inside the container. However if you pass a volume -v [host]:[container] then the changes are discarded. i was not able to reproduce that. Steps to reproduce the issue: Its just a way of adding metadata to the image so someone else can docker image inspect
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