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https://issues.apache.org/jira/browse/MESOS-7675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068513#comment-16068513
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James Peach edited comment on MESOS-7675 at 6/29/17 5:34 PM:
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{quote}
Would this monitor only the network ports advertised as `ports` resources?
Wondering about interaction with ephemeral ports.
{quote}
It ensures that any ports that processes are listening on are within the
allocated {{ports}} resources. So ephemeral ports bound by connecting to other
services aren't checked. Ephemeral port bound by listening on an {{ANY}}
address are checked and cause the container to be killed.
was (Author: jamespeach):
{quote}
Would this monitor only the network ports advertised as `ports` resources?
Wondering about interaction with ephemeral ports.
{quote}
It ensures that any ports that processes are listening on are within the
allocated {{ports}} resources. So ephemeral ports bound by connecting to other
services aren't checked.
> 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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