command: docker attach
short: Attach local standard input, output, and error streams to a running container
long: |-
  Use `docker attach` to attach your terminal's standard input, output, and error
  (or any combination of the three) to a running container using the container's
  ID or name. This allows you to view its ongoing output or to control it
  interactively, as though the commands were running directly in your terminal.

  > **Note:**
  > The `attach` command will display the output of the `ENTRYPOINT/CMD` process.  This
  > can appear as if the attach command is hung when in fact the process may simply
  > not be interacting with the terminal at that time.

  You can attach to the same contained process multiple times simultaneously,
  from different sessions on the Docker host.

  To stop a container, use `CTRL-c`. This key sequence sends `SIGKILL` to the
  container. If `--sig-proxy` is true (the default),`CTRL-c` sends a `SIGINT` to
  the container. If the container was run with `-i` and `-t`, you can detach from
  a container and leave it running using the `CTRL-p CTRL-q` key sequence.

  > **Note:**
  > A process running as PID 1 inside a container is treated specially by
  > Linux: it ignores any signal with the default action. So, the process
  > will not terminate on `SIGINT` or `SIGTERM` unless it is coded to do
  > so.

  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`).

  While a client is connected to container's stdio using `docker attach`, Docker
  uses a ~1MB memory buffer to maximize the throughput of the application. If
  this buffer is filled, the speed of the API connection will start to have an
  effect on the process output writing speed. This is similar to other
  applications like SSH. Because of this, it is not recommended to run
  performance critical applications that generate a lot of output in the
  foreground over a slow client connection. Instead, users should use the
  `docker logs` command to get access to the logs.

  ### 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:

  * `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 [**Configuration file** section](cli.md#configuration-files).
usage: docker attach [OPTIONS] CONTAINER
pname: docker
plink: docker.yaml
options:
- option: detach-keys
  value_type: string
  description: Override the key sequence for detaching a container
  deprecated: false
  experimental: false
  experimentalcli: false
  kubernetes: false
  swarm: false
- option: no-stdin
  value_type: bool
  default_value: "false"
  description: Do not attach STDIN
  deprecated: false
  experimental: false
  experimentalcli: false
  kubernetes: false
  swarm: false
- option: sig-proxy
  value_type: bool
  default_value: "true"
  description: Proxy all received signals to the process
  deprecated: false
  experimental: false
  experimentalcli: false
  kubernetes: false
  swarm: false
examples: |-
  ### Attach to and detach from a running container

  ```bash
  $ docker run -d --name topdemo ubuntu /usr/bin/top -b

  $ docker attach topdemo

  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


   top - 02:05:58 up  3:06,  0 users,  load average: 0.01, 0.02, 0.05
   Tasks:   1 total,   1 running,   0 sleeping,   0 stopped,   0 zombie
   Cpu(s):  0.2%us,  0.3%sy,  0.0%ni, 99.5%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
   Mem:    373572k total,   355780k used,    17792k free,    27880k 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
  ^C$

  $ echo $?
  0
  $ docker ps -a | grep topdemo

  7998ac8581f9        ubuntu:14.04        "/usr/bin/top -b"   38 seconds ago      Exited (0) 21 seconds ago                          topdemo
  ```

  ### Get the exit code of the container's command

  And in this second example, you can see the exit code returned by the `bash`
  process is returned by the `docker attach` command to its caller too:

  ```bash
      $ docker run --name test -d -it debian

      275c44472aebd77c926d4527885bb09f2f6db21d878c75f0a1c212c03d3bcfab

      $ docker attach test

      root@f38c87f2a42d:/# exit 13

      exit

      $ echo $?

      13

      $ docker ps -a | grep test

      275c44472aeb        debian:7            "/bin/bash"         26 seconds ago      Exited (13) 17 seconds ago                         test
  ```
deprecated: false
experimental: false
experimentalcli: false
kubernetes: false
swarm: false

