Question 80599 in Docker Question posted in
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How to run command with docker that saves data on local machine

My intention is to dump data from Django app (running inside docker container) directly on the disk and not inside the container.
Any ideas how to do it?
I tried this:

docker exec -it app bash -c "python manage.py dumpdata > data.json"

but the data is saved inside container.

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4

Answers


  1. 0

    You can use a volume when running docker run

    docker exec -it app bash -c "python manage.py dumpdata > /data/data.json" -v $pwd:/data
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  2. 0

    You can use a volume parameter with the docker run command:

    docker run -v /app/logs:/app/logs ...

    Reference: https://docs.docker.com/engine/reference/commandline/run/#volume

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  3. 0

    First, run your container with the -v option:

    docker run -v $(pwd):/data-out <app-image>

    This will map your current directory (pwd) to the container’s /data-out dir (it will create this dir inside the container if it doesn’t exist). You can change $(pwd) to /something/else if you want.

    Second, execute your command:

    docker exec -it app bash -c "python manage.py dumpdata > /data-out/data.json"

    Notice that the output goes to the data-out dir.

    Finally, view your file locally:

    cat data.json
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  4. 0

    Redirect output of docker command, not python.

    docker exec -it app bash -c "python manage.py dumpdata" > data.json

    UPD: if manage.py is in working directory you can also omit bash invocation:

    docker exec -it app python manage.py dumpdata > data.json
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