[Bug 1737866] Re: Too many open files when large number of routers on a host

[Xav Paice]

Subscribed field-high because we have an active environment (more?) that
are are affected by this using Xenial/Ocata, and we really need that SRU
released.

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https://bugs.launchpad.net/bugs/1737866

Title:
  Too many open files when large number of routers on a host

Status in OpenStack neutron-openvswitch charm:
  Invalid
Status in openvswitch package in Ubuntu:
  Fix Released
Status in openvswitch source package in Xenial:
  Triaged
Status in openvswitch source package in Artful:
  Triaged
Status in openvswitch source package in Bionic:
  Fix Released

Bug description:
  When there are a large number of routers and dhcp agents on a host, we
  see a syslog error repeated:

  "hostname ovs-vswitchd: ovs|1762125|netlink_socket|ERR|fcntl: Too many
  open files"

  If I check the number of filehandles owned by the pid for "ovs-
  vswitchd unix:/var/run/openvswitch/db.sock" I see close to/at 65535
  files.

  If I then run the following, we double the limit and (in our case) saw
  the count rise to >80000:

  prlimit -p $pid --nofile=131070

  We need to be able to:
  - monitor via nrpe, if the process is running short on filehandles
  - configure the limit so we have the option to not run out.

  Currently, if I restart the process, we'll lose this setting.

  Needless to say, openvswitch running out of filehandles causes all
  manner of problems for services which use it.

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