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From "Anindya Sinha (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (MESOS-6489) Better support for containers that want to manage their own cgroup.
Date Wed, 02 Nov 2016 04:45:58 GMT

     [ https://issues.apache.org/jira/browse/MESOS-6489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anindya Sinha reassigned MESOS-6489:
------------------------------------

    Assignee: Anindya Sinha

> Better support for containers that want to manage their own cgroup.
> -------------------------------------------------------------------
>
>                 Key: MESOS-6489
>                 URL: https://issues.apache.org/jira/browse/MESOS-6489
>             Project: Mesos
>          Issue Type: Improvement
>          Components: cgroups
>            Reporter: Jie Yu
>            Assignee: Anindya Sinha
>              Labels: cgroups
>
> Some containers want to manage their cgroup by sub-dividing the cgroup that Mesos allocates
to them into multiple sub-cgroups and put subprocess into the corresponding sub-cgroups.
> For instance, someone wants to run Docker daemon in a Mesos container. Docker daemon
will manage the cgroup assigned to it by Mesos (with the help , for example, cgroups namespace).
> Problems arise during the teardown of the container because two entities might be manipulating
the same cgroup simultaneously. For example, the Mesos cgroups::destroy might fail if the
task running inside is trying to delete the same nested cgroup at the same time.
> To support that case, we should consider kill all the processes in the Mesos cgroup first,
making sure that no one will be creating sub-cgroups and moving new processes into sub-cgroups.
And then, destroy the cgroups recursively.
> And we need freezer because we want to make sure all processes are stopped while we are
sending kill signals to avoid TOCTTOU race problem. I think it makes more sense to freezer
the cgroups (and sub-cgroups) from top down (rather than bottom up because typically, processes
in the parent cgroup manipulate sub-cgroups).



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