/users/home/foo/project); To be clear, are ADD X Y and ADD /X Y completely identical, or is there any subtle difference at all? This please! @wilnauem the issue was closed because the documentation was updated to explain that an absolute path refers to an absolute path within the build context, not an absolute path on the host; https://github.com/docker/docker/pull/5762/files. By clicking Sign up for GitHub, you agree to our terms of service and Executes it with docker build -t mvcapp . What about adding a new command that interprets absolute paths relative to the root of the host machine? I just want to have all files in the apache2 folder on my host to config it. However at the least the message is wrong and should be something like "forbidden path outside the context". WORKDIR sets the directory context to the specified folder. You signed in with another tab or window. Successfully merging a pull request may close this issue. It doesnt seem to find the game:latest image even though the output of the above command says it just created it. The text was updated successfully, but these errors were encountered: I've updated the title here to reflect the issue that needs to be fixed here. The root '/' support (which isn't one) should be deprecated. I'm running on windows, why does it replaces it to a absolute path, that doesn't exists on windows? to your account. I.e. I totally agree with @nafg Its much better than getting an unhelpful lstat: : no such file or directory error message, with the root '/' removed in the path. Either you should not use / in the volume name to create a named volume or use relative path starting with ./ to refer to a folder on your host machine. Docker should generate a warning when an absolute path is found, and eventually a few release later, an error. Add some more specific help for Dockerfile build contexts. Hi, I am not sure I understand what you want to achieve here. The COPY instruction is responsible to copy files from the host into the image. that you may wish to include in multiple images, then you need to duplicate these files into each build directory. Fair enough that ADD and COPY can't be used for this, due to how they've historically interpreted absolute paths. Already on GitHub? Docker file selector should check if the docker file is in the project base path. Perhaps we could check to see if the (FQFN) is on a mounted device and allow that? Given this directory (e.g. You could run a container, use docker cp to copy the content out to ./image_apache/www and mount that back into the container so you could modify the files from the host. From @tianon: Imagine that I have a Dockerfile that does "ADD /etc/shadow /my/path \n RUN some-command-to-upload-your-etc-shadow-to-my-server". Have a question about this project? privacy statement. This config files exist in my container (when I disable the volume on docker-compose.yaml). COPY is the prefered instruction to copy the files, as it realy just copies the files (and allows to modify the ownership of the files if needed), Powered by Discourse, best viewed with JavaScript enabled, Docker can't find the file it just copied in build, https://docs.docker.com/engine/reference/builder/#workdir. Throw an error "Docker does not support absolute paths with this operation." @thaJeztah However if you have common files (tar, configuration, html etc.) One could image having a shared file system with lots of common files that are required for different classes of images or for all images (maybe some legal/copywrite document). If you use relativ paths they must be relative to the WORKDIR path. @ipbabble I'm trying to build an image on ubuntu:latest and given below is the error : The issue still persists for me The best explanation so far, thanks buddy. This is what will never happen. As far as I know this is an invalid volume name: image_apache/www. See #2745 for more discussion of why adding files outside the build context isn't and probably won't be supported. I have managed to build the Docker container image and tag it, but when I run it I have problems. Sign in You want to mount existing files from your host machine to the container, which should work. @wilnauem the issue was closed because the documentation was updated to explain that an absolute path refers to an absolute path within the build context, not an absolute path on the host; https://github.com/docker/docker/pull/5762/files. Changing that format/handling would be a huge breaking change, breaking tons of existing Dockerfiles, so not an option. $ ls I forget to mention the relevant part: the WORKDIR instruction is not responsible to copy any files - neither from your hosts working directory, nor from any other folder. How can we maintain the security while at the same time solve the problem of having common files ADDed from one place. That's fine, but also kind of missing the crux of the issue. If you want to do the latter then I can see two options: Powered by Discourse, best viewed with JavaScript enabled. The failure is on purpose for security reasons. Your workdir is not the root directory where you copied start.py. People have use-cases that would be made easier if they had some way of reaching outside of the build context when adding content to their image, such as by using an absolute path. If absolute path is relative, then why do we need it? Anyway, adding / seemd to make some thins work. ADD of an absolute path fails with "no such file or directory" instead of "path outside context". it adds the file from the root of the context - so when you say ADD /etc/shadow /, Docker build is expecting that the user put an /etc/shadow file into the context. Right now trying to ADD a fully qualified file name (FQFN), e.g. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. if absolute paths are relative to the context, and relative paths are (presumably) also relative to the context. :). You want to mount an empty folder and expect the files inside the container to be copied to your local folder on your host machine. I wasted time discovering that absolute paths are not supported. The out put of Docker run is now: You might want to make it a habit to read the Dockerfile reference in case something is unclear: https://docs.docker.com/engine/reference/builder/#workdir. WORKDIR also affects `docker exec. It wasn't obvious to me and I spend half a day fighting it. Or some other magic. I tried to add it in the Dockerfile but still got the same error: I dont understand the image not found issue but you should use full path in the CMD instruction. ADD /file / works. $ python start.py, The working directory is still not the root, so your command would not work either without fixing the path by adding / to the beginning. Consider that the client might be remote from the docker daemon. https://github.com/docker/docker/pull/5762/files. and remove unneeded documentation, so it will be obvious. I also try to do this after logging into my session. But, when I mount the volumes for the config files apache2 or php (docker-compose), this file doesnt appear. I have been given a project that is in a Docker container. You can also try to go into your docker container and try to launch your app with: docker exec -it appname Why has this issue been closed? I want to create a custom container from a dockerfile with apache2, php and sqlite3. Well occasionally send you account related emails. Hello, /home/mydir/testfile will fail with the error "no such file or directory". N.B:: the ADD instruction could be used as well, though it will extract archived files and as such might result in a different outcomme than expected. I am very new to Focker but shouldnt WORKDIR make my local working directory copied in the image so I can run start.py ?