[Bug 1727063] Re: Pacemaker package upgrades stop but fail to start pacemaker resulting in HA outage

[James Page]

** Description changed:

  [Impact]
  upgrades of the pacemaker package don't restart pacemaker after the package upgrade, resulting in down HA clusters.
  
  [Test Case]
  sudo apt install pacemaker
  sudo systemctl start pacemaker
  sudo dpkg-reconfigure pacemaker
  
  pacemaker daemons will not be restarted.
  
  [Regression Potential]
- TBC as not quite sure where the fix for this is.
+ Minimal, earlier and later versions provide the defaults in the lsb header.
  
  [Original Bug Report]
  We have found on our openstack charm-hacluster implementations that the pacemaker .deb packaging along with the upstream pacemaker configuration result in pacemaker stopping but not starting upon package upgrade (while attended or unattended).
  
  This was seen on three separate Xenial clouds.  Both Mitaka and Ocata.
  
  The package upgrade today was to pacemaker 1.1.14-2ubuntu1.2.
  
  It appears that pacemaker.prerm stops the service using
  "invoke-rc.d pacemaker stop" and then the pacemaker.postinst attempts to start the service, but silently fails due to policy denial.  It appears the policy check fails because /etc/rcX.d/S*pacemaker does not exist because /etc/init.d/pacemaker has no Default-Start or Default-Stop entries in the LSB init headers.  (or rather, they are blank.)
  
  I have not checked whether this affects trusty environments.
  
  I'd suggest on systems that use systemd, the pacemaker.postinst script
  should check if the service is enabled and start it with systemctl
  commands rather than using the cross-platform compatible invoke-rc.d
  wrappers.  Or upstream pacemaker should get default start/stop entries.
  
  Our default runlevel on cloud init built images appears to be 5
  (graphical), so at least 5 should be present in /etc/init.d/pacemaker
  LSB init headers under Default-Start:.

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https://bugs.launchpad.net/bugs/1727063

Title:
  Pacemaker package upgrades stop but fail to start pacemaker resulting
  in HA outage

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