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

[Christian Ehrhardt ]

This is uploaded to Ubuntu 21.04 already.
Just needs some builds and tests to complete.

I'm slightly unsure if this should be SRUed or if - for older releases
we'd ask users to adapt the configuration if affected. I'm slightly
leaning to an SRU but look at James/Frode for a decsion.

** Also affects: openvswitch (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: dpdk (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: openvswitch (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: dpdk (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: openvswitch (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: dpdk (Ubuntu Focal)
   Importance: Undecided
       Status: New

** No longer affects: dpdk (Ubuntu Bionic)

** No longer affects: dpdk (Ubuntu Focal)

** No longer affects: dpdk (Ubuntu Groovy)

** Changed in: openvswitch (Ubuntu Bionic)
       Status: New => Confirmed

** Changed in: openvswitch (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: openvswitch (Ubuntu Groovy)
       Status: New => Confirmed

** Changed in: openvswitch (Ubuntu)
       Status: Confirmed => In Progress

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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:
  In Progress
Status in openvswitch source package in Bionic:
  Confirmed
Status in openvswitch source package in Focal:
  Confirmed
Status in openvswitch source package in Groovy:
  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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