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  1. Docker volume and docker VOLUME

    I've been fiddling with docker lately and it took me a while to come to this realisation. The docker volume command line argument and the docker VOLUME Dockerfile instruction are a bit different.

    The docker volume command line argument:

    docker run -v /var/logs:/var/logs ubuntu echo test
    

    And the docker VOLUME Dockerfile instruction:

    VOLUME /var/logs
    

    The Dockerfile VOLUME instruction doesn't support host directories.

    As discussed in this stackoverflow post it looks like this is intentional because it makes things less portable.

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