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[Launchpad Bug Tracker <1737866@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package openvswitch - 2.8.1-0ubuntu3

---------------
openvswitch (2.8.1-0ubuntu3) bionic; urgency=medium

  * Updates to systemd configuration:
    - Move to distinct units for ovsdb-server and ovs-vswitchd.
  * Drop obsolete upstart configuration file.
  * Bump nofiles to 1048576 for ovs daemons (LP: #1737866).
  * d/control: Bump minimum debhelper version to 10, drop BD on
    dh-systemd.
  * d/p/dpif-kernel-gre-mtu-workaround.patch,
    d/p/dpif-netlink-rtnl-Use-65000-instead-of-65535-as-tunnel-MTU.patch:
    Cherry pick in-flight fixes for workaround to correctly set MTU
    of GRE devices via netlink (LP: #1742505).

 -- James Page <james.page@xxxxxxxxxx>  Thu, 18 Jan 2018 15:26:41 +0200

** Changed in: openvswitch (Ubuntu Bionic)
       Status: Fix Committed => Fix 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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