DOCKER(1)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
-t).
Override the detach sequence
If you want, you can configure an 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="<sequence>" flag with the docker attach command. The
format of the <sequence> is either a letter [a-Z], or the ctrl-
combined with any of the following:
o a-z (a single lowercase alpha character )
o @ (at sign)
o [ (left bracket)
o \\ (two backward slashes)
o _ (underscore)
o ^ (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).
EXAMPLES
Attaching to a container
In this example the top command is run inside a container, from an
image called fedora, in detached mode. The ID from the container is
passed into the docker attach command:
$ ID=$(sudo docker run -d fedora /usr/bin/top -b)
$ sudo docker attach $ID
top - 02:05:52 up 3:05, 0 users, load average: 0.01, 0.02, 0.05
Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1%us, 0.2%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 373572k total, 355560k used, 18012k free, 27872k buffers
Swap: 786428k total, 0k used, 786428k free, 221740k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 17200 1116 912 R 0 0.3 0:00.03 top
top - 02:05:55 up 3:05, 0 users, load average: 0.01, 0.02, 0.05
Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.2%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 373572k total, 355244k used, 18328k free, 27872k buffers
Swap: 786428k total, 0k used, 786428k free, 221776k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 17208 1144 932 R 0 0.3 0:00.03 top
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)
Docker Community Jun 2020 DOCKER(1)