Question 184949 in Docker Question posted in
The official documentation can be found here.

Detect whether script running inside docker container

How can a script detect whether it is running inside a container?

#!/bin/sh
if [ ... ]; then                 # ?
  echo 'running in container'
else
  echo 'running on host'
fi
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    The /.dockerenv file always exists in a docker container, so I check that:

    #!/bin/sh
if [ -f /.dockerenv ]; then
  echo 'running in container'
else
  echo 'running on host'
fi

    But note that file is an artefact of an older docker design, and could be removed in a future docker version. So this is a workaround, rather than a solution.


  2. 0

    This is one way with bash :

    #!/bin/bash

in_docker(){
    local cgroup=/proc/self/cgroup
    test -f $cgroup && [[ "$(<$cgroup)" = *:cpuset:/docker/* ]]
}

if in_docker; then
  echo 'running in container'
else
  echo 'running on host'
fi

    You need to convert to sh syntax if you don’t have bash in your container.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search