Question 83231 in Docker Question posted in
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How can a script check if a particular Docker container is running?

I would like to have a shell script that checks if a particular container is running.

For example, I might want to start the container if it’s not already running, or query some piece of information about it like what ports are exposed.

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2

Answers


  1. Chosen as BEST ANSWER
    0

    The docker ps command takes a -f / --filter option to locate the desired container. To test if the container is running by name we might try

    $ docker ps --filter "name=myapp" --filter "status=running"
CONTAINER ID   IMAGE               COMMAND   CREATED          STATUS          PORTS     NAMES
91959ed76e77   foo/barbaz:latest   "/init"   10 minutes ago   Up 10 minutes             myapp

    If we just want the container ID, because we're going to pass it to another command like docker exec, we can use -q / --quiet:

    $ docker ps --filter "name=myapp" --filter "status=running" --quiet
91959ed76e77

    To just check whether it is running, we can see if the output is non-empty:

    if [ -n "$(docker ps -f "name=myapp" -f "status=running" -q )" ]; then
    echo "the container is running!"
fi

    Or if we want some other piece of information about it, --format:

    $ docker ps -f "name=myapp" -f "status=running" --format "{{.Image}}"
foo/barbaz:latest

  2. 0

    You might also try using the docker inspect command which works well with myapp as the container’s name … or the container’s id :

    if [ "$(docker inspect myapp --format '{{.State.Status}}')" = "running" ]; then
    echo "the container is running!"
fi
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