57 lines
2.0 KiB
Markdown
57 lines
2.0 KiB
Markdown
<!--[metadata]>
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+++
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title = "exec"
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description = "The exec command description and usage"
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keywords = ["command, container, run, execute"]
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[menu.main]
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parent = "smn_cli"
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+++
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<![end-metadata]-->
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# exec
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Usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
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Run a command in a running container
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-d, --detach Detached mode: run command in the background
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--detach-keys Specify the escape key sequence used to detach a container
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--help Print usage
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-i, --interactive Keep STDIN open even if not attached
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--privileged Give extended Linux capabilities to the command
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-t, --tty Allocate a pseudo-TTY
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-u, --user= Username or UID (format: <name|uid>[:<group|gid>])
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The `docker exec` command runs a new command in a running container.
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The command started using `docker exec` only runs while the container's primary
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process (`PID 1`) is running, and it is not restarted if the container is
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restarted.
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If the container is paused, then the `docker exec` command will fail with an error:
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$ docker pause test
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test
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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1ae3b36715d2 ubuntu:latest "bash" 17 seconds ago Up 16 seconds (Paused) test
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$ docker exec test ls
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FATA[0000] Error response from daemon: Container test is paused, unpause the container before exec
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$ echo $?
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1
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## Examples
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$ docker run --name ubuntu_bash --rm -i -t ubuntu bash
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This will create a container named `ubuntu_bash` and start a Bash session.
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$ docker exec -d ubuntu_bash touch /tmp/execWorks
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This will create a new file `/tmp/execWorks` inside the running container
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`ubuntu_bash`, in the background.
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$ docker exec -it ubuntu_bash bash
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This will create a new Bash session in the container `ubuntu_bash`.
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