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https://issues.apache.org/jira/browse/MESOS-6540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15633713#comment-15633713
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Kevin Klues commented on MESOS-6540:
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Are you sure? I thought about this a bit more after our conversation yesterday,
and it's not clear to me how we could do it with just a pipe. The
{{contiainerizer launch}} binary is already cloned into the new pid namespace,
so if we just passed the pid back that it forks, it will be the wrong pid from
the perspective of the agent.
> Pass the forked pid from `containerizer launch` to the agent and checkpoint
> it.
> -------------------------------------------------------------------------------
>
> Key: MESOS-6540
> URL: https://issues.apache.org/jira/browse/MESOS-6540
> Project: Mesos
> Issue Type: Task
> Reporter: Kevin Klues
> Assignee: Kevin Klues
> Labels: debugging, mesosphere
>
> Right now the agent only knows about the pid of the "init" process forked by
> {{launcher->fork()}}. However, in order to properly enter the namespaces of a
> task for a nested container, we actually need the pid of the process that
> gets launched by the {{containerizer launch}} binary.
> Using this pid, isolators can properly enter the namespaces of the actual
> *task* or *executor* launched by the {{containerizer launch}} binary instead
> of just the namespaces of the "init" process (which may be different).
> This will involve opening a domain socket with the {{containerizer launch}}
> binary and passing the translated pid from the forked process back to the
> agent. We can chieve this by opening the socket on the agent and passing the
> path to it using {{launchFlags}}.
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