How to set an environment variable in a running docker container

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There are generaly two options, because docker doesn’t support this feature now:

  1. Create your own script, which will act like runner for your command. For example:

    #!/bin/bash
export VAR1=VAL1
export VAR2=VAL2
your_cmd

  2. Run your command following way:

    docker exec -i CONTAINER_ID /bin/bash -c "export VAR1=VAL1 && export VAR2=VAL2 && your_cmd"

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