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From "James Peach (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-7675) Isolate network ports.
Date Thu, 29 Jun 2017 16:55:00 GMT

    [ https://issues.apache.org/jira/browse/MESOS-7675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068609#comment-16068609
] 

James Peach commented on MESOS-7675:
------------------------------------

TODO optionally check only listening sockets that are advertised by master.

> Isolate network ports.
> ----------------------
>
>                 Key: MESOS-7675
>                 URL: https://issues.apache.org/jira/browse/MESOS-7675
>             Project: Mesos
>          Issue Type: Improvement
>          Components: agent
>            Reporter: James Peach
>            Assignee: James Peach
>            Priority: Minor
>
> If a task uses network ports, there is no isolator that can enforce that it only listens
on the ports that it has resources for. Implement a ports isolator that can limit tasks to
listen only on allocated TCP ports.
> Roughly, the algorithm for this follows what standard tools like {{lsof}} and {{ss}}
do.
> * Find all the listening TCP sockets (using netlink)
> * Index the sockets by their node (from the netlink information)
> * Find all the open sockets on the system (by scanning {{/proc/\*/fd/\*}} links)
> * For each open socket, check whether its node (given in the link target) in the set
of listen sockets that we scanned
> * If the socket is a listening socket and the corresponding PID is in the task, send
a resource limitation for the task
> Matching pids to tasks depends on using cgroup isolation, otherwise we would have to
build a full process tree, which would be nice to avoid.
> Scanning all the open sockets can be avoided by using the {{net_cls}} isolator with kernel
+ libnl3 patches to publish the socket classid when we find the listening socket.



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