DOCKER(1)

NAME
docker-container-attach - Attach local standard input, output, and error streams to a running container

SYNOPSIS
docker container attach [OPTIONS] CONTAINER

DESCRIPTION
The docker attach command allows you to attach to a running container using the container's ID or name, either to view its ongoing output or to control it interactively. You can attach to the same contained process multiple times simultaneously, screen sharing style, or quickly view the progress of your detached process.

To stop a container, use CTRL-c. This key sequence sends SIGKILL to the container. You can detach from the container (and leave it running) using a configurable key sequence. The default sequence is CTRL-p CTRL-q. You configure the key sequence using the --detach-keys option or a configuration file. See config-json(5) for documentation on using a configuration file.

It is forbidden to redirect the standard input of a docker attach command while attaching to a TTY-enabled container (i.e., launched with -i and -t).

EXAMPLES

Attaching to a container
In this example the top command is run inside a container from an ubuntu image, in detached mode, then attaches to it, and then terminates the container with CTRL-c:
    $ docker run -d --name topdemo alpine top -b
    $ docker attach topdemo
    Mem: 2395856K used, 5638884K free, 2328K shrd, 61904K buff, 1524264K cached
    CPU:   0% usr   0% sys   0% nic  99% idle   0% io   0% irq   0% sirq
    Load average: 0.15 0.06 0.01 1/567 6
    PID  PPID USER     STAT   VSZ %VSZ CPU %CPU COMMAND
    1     0 root     R     1700   0%   3   0% top -b
    ^C

Override the detach sequence
Use the --detach-keys option to override the Docker key sequence for detach. This is useful if the Docker default sequence conflicts with key sequence you use for other applications. There are two ways to define your own detach key sequence, as a per-container override or as a configuration property on your entire configuration.

To override the sequence for an individual container, use the --detach-keys=key flag with the docker attach command. The format of the key is either a letter [a-Z], or the ctrl-value, where value is one of the following:

•   a-z (a single lowercase alpha character )

•   @ (at sign)

•   [ (left bracket)

•   *\\* (two backward slashes)

•   _ (underscore)

•   ^ (caret)

These a, ctrl-a, X, or *ctrl-\* values are all examples of valid key sequences. To configure a different configuration default key sequence for all containers, see docker(1).

OPTIONS
--detach-keys=""
    Override the key sequence for detaching a container

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

--no-stdin[=false]
    Do not attach STDIN

--sig-proxy[=true]
    Proxy all received signals to the process

SEE ALSO
docker-container(1)