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https://issues.apache.org/jira/browse/MESOS-6467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706709#comment-15706709
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Jie Yu commented on MESOS-6467:
-------------------------------
commit 4dcc42790752b8e26d5e5e9d96b9d082baec3f91
Author: Kevin Klues <[email protected]>
Date: Tue Nov 29 13:50:02 2016 -0800
Added helper to get the io switchboard server address.
For now, the io switchboard server will always hosted on a unix domain
socket. The path limit for a unix domain socket is 100 bytes, so we
can't just use a file in our runtime directory as the socket file we
connect to. Instead, we store the path to the socket file in our
runtime directory and read it from there.
Review: https://reviews.apache.org/r/53938/
> Build a Container I/O Switchboard
> ---------------------------------
>
> Key: MESOS-6467
> URL: https://issues.apache.org/jira/browse/MESOS-6467
> Project: Mesos
> Issue Type: Task
> Reporter: Kevin Klues
> Assignee: Kevin Klues
> Labels: debugging, mesosphere
>
> In order to facilitate attach operations for a running container, we plan to
> introduce a new component into Mesos known as an “I/O switchboard”. The goal
> of this switchboard is to allow external components to *dynamically*
> interpose on the {{stdin}}, {{stdout}} and {{stderr}} of the init process of
> a running Mesos container. It will be implemented as a per-container,
> stand-alone process launched by the mesos containerizer at the time a
> container is first launched.
> Each per-container switchboard will be responsible for the following:
> * Accepting a single dynamic request to register an fd for streaming data to
> the {{stdin}} of a container’s init process.
> * Accepting *multiple* dynamic requests to register fds for streaming data
> from the {{stdout}} and {{stderr}} of a container’s init process to those fds.
> * Allocating a pty for the new process (if requested), and directing data
> through the master fd of the pty as necessary.
> * Passing the *actual* set of file descriptors that should be dup’d onto the
> {{stdin}}, {{stdout}} and {{stderr}} of a container’s init process back to
> the containerizer.
> The idea being that the switchboard will maintain three asynchronous loops
> (one each for {{stdin}}, {{stdout}} and {{stderr}}) that constantly pipe data
> to/from a container’s init process to/from all of the file descriptors that
> have been dynamically registered with it.
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