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Merge pull request #22611 from tonistiigi/attach-docs

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docs: clarify docker attach
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Sebastiaan van Stijn 2016-05-09 22:59:07 +02:00
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docs/reference/commandline/attach.md
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@ -39,6 +39,15 @@ using `CTRL-p CTRL-q` key sequence.
It is forbidden to redirect the standard input of a `docker attach` command 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 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 ## Override the detach sequence