Docker: Attach and detach

By default, Docker containers run in the foreground.

For example, when you execute the below command in the terminal, terminal gets blocked until the container exited.

docker run ubuntu sleep 1000

If you run the container in detached mode, container starts, and control will get back to the terminal. Use the option -d to run the container in detached mode.

To attach to the running container execute the ‘attach’ command.

Syntax

docker attach {containerId}/{containerName}

$docker run -d ubuntu sleep 1000
e65cb62065df23e995deab943ff637b4953cad01bdb11d195902e1a9c3b076b1
$
$docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
e65cb62065df        ubuntu              "sleep 1000"        4 seconds ago       Up 3 seconds                            nostalgic_saha
$
$docker attach e65cb62065df

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