100 lines
4.0 KiB
Markdown
100 lines
4.0 KiB
Markdown
% DOCKER(1) Docker User Manuals
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% Docker Community
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% JUNE 2014
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# NAME
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docker-attach - Attach to a running container
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# SYNOPSIS
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**docker attach**
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[**--detach-keys**[=*[]*]]
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[**--help**]
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[**--no-stdin**]
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[**--sig-proxy**[=*true*]]
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CONTAINER
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# DESCRIPTION
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The **docker attach** command allows you to attach to a running container using
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the container's ID or name, either to view its ongoing output or to control it
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interactively. You can attach to the same contained process multiple times
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simultaneously, screen sharing style, or quickly view the progress of your
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detached process.
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To stop a container, use `CTRL-c`. This key sequence sends `SIGKILL` to the
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container. You can detach from the container (and leave it running) using a
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configurable key sequence. The default sequence is `CTRL-p CTRL-q`. You
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configure the key sequence using the **--detach-keys** option or a configuration
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file. See **config-json(5)** for documentation on using a configuration file.
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It is forbidden to redirect the standard input of a `docker attach` command while
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attaching to a tty-enabled container (i.e.: launched with `-t`).
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# OPTIONS
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**--detach-keys**=""
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Override the key sequence for detaching a container. Format is a single character `[a-Z]` or `ctrl-<value>` where `<value>` is one of: `a-z`, `@`, `^`, `[`, `,` or `_`.
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**--help**
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Print usage statement
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**--no-stdin**=*true*|*false*
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Do not attach STDIN. The default is *false*.
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**--sig-proxy**=*true*|*false*
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Proxy all received signals to the process (non-TTY mode only). SIGCHLD, SIGKILL, and SIGSTOP are not proxied. The default is *true*.
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# Override the detach sequence
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If you want, you can configure an override the Docker key sequence for detach.
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This is useful if the Docker default sequence conflicts with key sequence you
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use for other applications. There are two ways to define your own detach key
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sequence, as a per-container override or as a configuration property on your
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entire configuration.
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To override the sequence for an individual container, use the
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`--detach-keys="<sequence>"` flag with the `docker attach` command. The format of
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the `<sequence>` is either a letter [a-Z], or the `ctrl-` combined with any of
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the following:
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* `a-z` (a single lowercase alpha character )
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* `@` (at sign)
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* `[` (left bracket)
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* `\\` (two backward slashes)
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* `_` (underscore)
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* `^` (caret)
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These `a`, `ctrl-a`, `X`, or `ctrl-\\` values are all examples of valid key
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sequences. To configure a different configuration default key sequence for all
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containers, see **docker(1)**.
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# EXAMPLES
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## Attaching to a container
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In this example the top command is run inside a container, from an image called
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fedora, in detached mode. The ID from the container is passed into the **docker
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attach** command:
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# ID=$(sudo docker run -d fedora /usr/bin/top -b)
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# sudo docker attach $ID
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top - 02:05:52 up 3:05, 0 users, load average: 0.01, 0.02, 0.05
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Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie
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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
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Mem: 373572k total, 355560k used, 18012k free, 27872k buffers
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Swap: 786428k total, 0k used, 786428k free, 221740k cached
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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1 root 20 0 17200 1116 912 R 0 0.3 0:00.03 top
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top - 02:05:55 up 3:05, 0 users, load average: 0.01, 0.02, 0.05
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Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie
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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
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Mem: 373572k total, 355244k used, 18328k free, 27872k buffers
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Swap: 786428k total, 0k used, 786428k free, 221776k cached
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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1 root 20 0 17208 1144 932 R 0 0.3 0:00.03 top
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# HISTORY
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April 2014, Originally compiled by William Henry (whenry at redhat dot com)
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based on docker.com source material and internal work.
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June 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>
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