DOCKER(1)                                                            DOCKER(1)

       docker-container-exec - Run a command in a running container

       docker container exec [OPTIONS] CONTAINER COMMAND [ARG...]

       Run a process in a running container.

       The command started using docker exec will only run while the
       container's primary process (PID 1) is running, and will not be
       restarted if the container is restarted.

       If the container is paused, then the docker exec command will wait
       until the container is unpaused, and then run

       privileged gives the process extended Linux capabilities
       <> when running
       in a container.

       Without this flag, the process run by docker exec in a running
       container has the same capabilities as the container, which may be
       limited. Set --privileged to give all capabilities to the process.

       user sets the username or UID used and optionally the groupname or GID
       for the specified command.

       The followings examples are all valid:
          --user [user | user:group | uid | uid:gid | user:gid | uid:group ]

       Without this argument the command will be run as root in the container.

Exit Status
       The exit code from docker exec gives information about why the
       container failed to exec or why it exited.  When docker exec exits with
       a non-zero code, the exit codes follow the chroot standard, see below:

       126 if the contained command cannot be invoked

              $ docker exec busybox /etc; echo $?
              # exec: "/etc": permission denied
                docker: Error response from daemon: Contained command could not be invoked

       127 if the contained command cannot be found

              $ docker exec busybox foo; echo $?
              # exec: "foo": executable file not found in $PATH
                docker: Error response from daemon: Contained command not found or does not exist

       Exit code of contained command otherwise

              $ docker exec busybox /bin/sh -c 'exit 3'
              # 3

       -d, --detach[=false]
           Detached mode: run command in the background

           Override the key sequence for detaching a container

       -e, --env=
           Set environment variables

       -h, --help[=false]
           help for exec

       -i, --interactive[=false]
           Keep STDIN open even if not attached

           Give extended privileges to the command

       -t, --tty[=false]
           Allocate a pseudo-TTY

       -u, --user=""
           Username or UID (format: <name|uid>[:<group|gid>])

       -w, --workdir=""
           Working directory inside the container


Docker Community                   May 2019                          DOCKER(1)

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