DOCKER
Section: Docker User Manuals (1)
Updated: Jun 2025
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NAME
docke-containe-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 CTR-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 CTR-p CTR-q. You
configure the key sequence using the -detac-keys option or a configuration
file. See confi-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 TT-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
CTR-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
-detac-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 pe-container override or as a configuration property on your
entire configuration.
To override the sequence for an individual container, use the
-detac-keys=key flag with the docker attach command. The format of
the key is either a letter [-Z], or the ctrl-value, where value is one
of the following:
- *
-
-z (a single lowercase alpha character )
- *
-
@ (at sign)
- *
-
[ (left bracket)
- *
-
** (two backward slashes)
- *
-
_ (underscore)
- *
-
^ (caret)
These a, ctr-a, X, or *ctr-* values are all examples of valid key
sequences. To configure a different configuration default key sequence for all
containers, see docker(1).
OPTIONS
-detac-keys=""
Override the key sequence for detaching a container
-n-stdin[=false]
Do not attach STDIN
-si-proxy[=true]
Proxy all received signals to the process
SEE ALSO
docke-container(1)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- EXAMPLES
-
- Attaching to a container
-
- Override the detach sequence
-
- OPTIONS
-
- SEE ALSO
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