[Bug 1937075] [NEW] ovn-ctl: ovsdb-server startup might sometimes get stuck and not upgrade clustered database

[Frode Nordahl]

Public bug reported:

As reported and fixed in [0] if the node that is configured with an
empty ``--db-*-cluster-remote-addr`` is no longer the leader, the ovn-
ctl script will hang on startup.

Prior to the hang the script will successfully start the ovsdb-server,
but never get to the point where a clustered DB is upgraded in the event
of a schema change.

0: https://github.com/ovn-
org/ovn/commit/65cc0e225b5922a72f0d40c2c39da0210669c21a

** Affects: ovn (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: ovn (Ubuntu Focal)
     Importance: High
         Status: Triaged

** Affects: ovn (Ubuntu Groovy)
     Importance: Undecided
         Status: Fix Released

** Affects: ovn (Ubuntu Hirsute)
     Importance: Undecided
         Status: Fix Released

** Affects: ovn (Ubuntu Impish)
     Importance: Undecided
         Status: Fix Released

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

** Also affects: ovn (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

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

** Also affects: ovn (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Changed in: ovn (Ubuntu Impish)
       Status: New => Fix Released

** Changed in: ovn (Ubuntu Hirsute)
       Status: New => Fix Released

** Changed in: ovn (Ubuntu Groovy)
       Status: New => Fix Released

** Changed in: ovn (Ubuntu Focal)
       Status: New => Triaged

** Changed in: ovn (Ubuntu Focal)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1937075

Title:
  ovn-ctl: ovsdb-server startup might sometimes get stuck and not
  upgrade clustered database

Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  Triaged
Status in ovn source package in Groovy:
  Fix Released
Status in ovn source package in Hirsute:
  Fix Released
Status in ovn source package in Impish:
  Fix Released

Bug description:
  As reported and fixed in [0] if the node that is configured with an
  empty ``--db-*-cluster-remote-addr`` is no longer the leader, the ovn-
  ctl script will hang on startup.

  Prior to the hang the script will successfully start the ovsdb-server,
  but never get to the point where a clustered DB is upgraded in the
  event of a schema change.

  0: https://github.com/ovn-
  org/ovn/commit/65cc0e225b5922a72f0d40c2c39da0210669c21a

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