github.com/sld880311/docker@v0.0.0-20200524143708-d5593973a475/docs/reference/commandline/exec.md (about)

     1  ---
     2  title: "exec"
     3  description: "The exec command description and usage"
     4  keywords: "command, container, run, execute"
     5  ---
     6  
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    15  
    16  # exec
    17  
    18  ```markdown
    19  Usage:  docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
    20  
    21  Run a command in a running container
    22  
    23  Options:
    24    -d, --detach         Detached mode: run command in the background
    25        --detach-keys    Override the key sequence for detaching a container
    26    -e, --env=[]         Set environment variables
    27        --help           Print usage
    28    -i, --interactive    Keep STDIN open even if not attached
    29        --privileged     Give extended privileges to the command
    30    -t, --tty            Allocate a pseudo-TTY
    31    -u, --user           Username or UID (format: <name|uid>[:<group|gid>])
    32  ```
    33  
    34  ## Description
    35  
    36  The `docker exec` command runs a new command in a running container.
    37  
    38  The command started using `docker exec` only runs while the container's primary
    39  process (`PID 1`) is running, and it is not restarted if the container is
    40  restarted.
    41  
    42  ## Examples
    43  
    44  ### Run `docker exec` on a running container
    45  
    46  First, start a container.
    47  
    48  ```bash
    49  $ docker run --name ubuntu_bash --rm -i -t ubuntu bash
    50  ```
    51  
    52  This will create a container named `ubuntu_bash` and start a Bash session.
    53  
    54  Next, execute a command on the container.
    55  
    56  ```bash
    57  $ docker exec -d ubuntu_bash touch /tmp/execWorks
    58  ```
    59  
    60  This will create a new file `/tmp/execWorks` inside the running container
    61  `ubuntu_bash`, in the background.
    62  
    63  Next, execute an interactive `bash` shell on the container.
    64  
    65  ```bash
    66  $ docker exec -it ubuntu_bash bash
    67  ```
    68  
    69  This will create a new Bash session in the container `ubuntu_bash`.
    70  
    71  ### Try to run `docker exec` on a paused container
    72  
    73  If the container is paused, then the `docker exec` command will fail with an error:
    74  
    75  ```bash
    76  $ docker pause test
    77  
    78  test
    79  
    80  $ docker ps
    81  
    82  CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                   PORTS               NAMES
    83  1ae3b36715d2        ubuntu:latest       "bash"              17 seconds ago      Up 16 seconds (Paused)                       test
    84  
    85  $ docker exec test ls
    86  
    87  FATA[0000] Error response from daemon: Container test is paused, unpause the container before exec
    88  
    89  $ echo $?
    90  1
    91  ```