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.p...@ubuntu.com>  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.

To manage notifications about this bug go to:
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