[Bug 1910209] Re: "systemctl stop openvswitch-switch" will remove /var/run/openvswitch

[Yi Yang]

Christian, thank you so much, the below solution works for me.

$ sudo systemctl edit ovsdb-server.service
[Service]
RuntimeDirectoryPreserve=yes

BTW, only one way to change vhostuser path is using ovs other_config
:vhost-sock-dir, but it is a subdir under /var/run/openvswitch, so it
can't fix this.

https://github.com/openvswitch/ovs/blob/master/lib/dpdk.c#L360.

If you create dpdkvhostuserclient port by yourself and add-port it by
yourself, you can specify full path, but for me, these are handled by
openstack, so I can't control this, other_config:vhost-sock-dir is only
one way to change this, but it is relative path, it can't be beyond
/var/run/openvswitch.

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https://bugs.launchpad.net/bugs/1910209

Title:
  "systemctl stop openvswitch-switch" will remove /var/run/openvswitch

Status in Ubuntu Server Guide:
  Fix Released
Status in dpdk package in Ubuntu:
  Invalid
Status in openvswitch package in Ubuntu:
  Confirmed

Bug description:
  TL;DR:
  - stoping/restarting OVS clears /var/run/openvswitch
  - out of the "vhostuser" connection times a common socket path used
    was at /var/run/openvswitch
  - if that path used with "vhostuserclient" that removes the sockets
    on OVS stop/restart
  - Since qemu in server mode only creates this sockets once (as by
    the client/server design makes sense) that breaks the guests until
    restarted which is what the tech of vhostuserclient wanted to avoid.
  + Workaround: do use a different path like e.g. 
    "/var/run/vhostuserclient/vhost-user-client-1"
  + Solution: let us think if we could keep the path around on stop/restart

  --- vv original report vv ---

  My system is Ubuntu 18.04, I installed ovs DPDK by apt-get and used
  ovs-vswitchd DPDK version, but when I stop openvswitch-switch (sudo
  systemctl stop openvswitch-switch), /var/run/openvswitch is removed,
  so the exisitng VMs can't be accessed any more. I don't know why it is
  removed and who removed it.

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