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command: docker exec

short: Run a command in a running container

long: |-

The `docker exec` command runs a new command in a running container.

The command started using `docker exec` only runs while the container's primary

process (`PID 1`) is running, and it is not restarted if the container is

restarted.

usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

pname: docker

plink: docker.yaml

options:

- option: detach

shorthand: d

default_value: "false"

description: 'Detached mode: run command in the background'

- option: detach-keys

description: Override the key sequence for detaching a container

- option: env

shorthand: e

default_value: '[]'

description: Set environment variables

- option: interactive

shorthand: i

default_value: "false"

description: Keep STDIN open even if not attached

- option: privileged

default_value: "false"

description: Give extended privileges to the command

- option: tty

shorthand: t

default_value: "false"

description: Allocate a pseudo-TTY

- option: user

shorthand: u

description: 'Username or UID (format: <name|uid>[:<group|gid>])'

examples: |-

### Run `docker exec` on a running container

First, start a container.

```bash

$ docker run --name ubuntu_bash --rm -i -t ubuntu bash

```

This will create a container named `ubuntu_bash` and start a Bash session.

Next, execute a command on the container.

```bash

$ docker exec -d ubuntu_bash touch /tmp/execWorks

```

This will create a new file `/tmp/execWorks` inside the running container

`ubuntu_bash`, in the background.

Next, execute an interactive `bash` shell on the container.

```bash

$ docker exec -it ubuntu_bash bash

```

This will create a new Bash session in the container `ubuntu_bash`.

### Try to run `docker exec` on a paused container

If the container is paused, then the `docker exec` command will fail with an error:

```bash

$ docker pause test

test

$ docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

1ae3b36715d2 ubuntu:latest "bash" 17 seconds ago Up 16 seconds (Paused) test

$ docker exec test ls

FATA[0000] Error response from daemon: Container test is paused, unpause the container before exec

$ echo $?

1

```