[Bug 1840347] Re: Ceph 12.2.12 restarts services during upgrade

[James Page]

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/queens
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/stein
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/train
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/rocky
   Importance: Undecided
       Status: New

** Changed in: cloud-archive/train
       Status: New => In Progress

** Changed in: cloud-archive/stein
       Status: New => In Progress

** Changed in: cloud-archive/rocky
       Status: New => In Progress

** Changed in: cloud-archive/queens
       Status: New => In Progress

** Changed in: cloud-archive/train
   Importance: Undecided => High

** Changed in: cloud-archive/stein
   Importance: Undecided => High

** Changed in: cloud-archive/rocky
   Importance: Undecided => High

** Changed in: cloud-archive/queens
   Importance: Undecided => High

** CVE removed: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2019-10222

** Changed in: cloud-archive/train
     Assignee: (unassigned) => James Page (james-page)

** Changed in: cloud-archive/stein
     Assignee: (unassigned) => James Page (james-page)

** Changed in: cloud-archive/rocky
     Assignee: (unassigned) => James Page (james-page)

** Changed in: cloud-archive/queens
     Assignee: (unassigned) => James Page (james-page)

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https://bugs.launchpad.net/bugs/1840347

Title:
  Ceph 12.2.12  restarts services during upgrade

Status in Ubuntu Cloud Archive:
  In Progress
Status in Ubuntu Cloud Archive queens series:
  In Progress
Status in Ubuntu Cloud Archive rocky series:
  In Progress
Status in Ubuntu Cloud Archive stein series:
  In Progress
Status in Ubuntu Cloud Archive train series:
  In Progress
Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Bionic:
  In Progress
Status in ceph source package in Disco:
  In Progress
Status in ceph source package in Eoan:
  Fix Released

Bug description:
  [Impact]

  Upgrading from ceph on Ubuntu 18.04 causes the ceph-osd services to be
  restarted without prompting.

  This appears to be in the configure section on the ceph-common,postinst:
  # Automatically added by dh_systemd_start/11.1.6ubuntu2
  if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
          if [ -d /run/systemd/system ]; then
                  systemctl --system daemon-reload >/dev/null || true
                  if [ -n "$2" ]; then
                          _dh_action=restart
                  else
                          _dh_action=start
                  fi
                  deb-systemd-invoke $_dh_action 'ceph.target' >/dev/null || true
          fi
  fi
  # End automatically added section

  This is a change of behaviour compare to debhelper 9.
  --restart-after-upgrade is the default in compat 10.

  The expected behavior during a package upgrade is to leave all the
  ceph service states unmodified. They should not be enabled/disabled or
  stopped/started.

  [Test Case]
  * Check pid of ceph-osd (before upgrade)
  * sudo apt-get update
  * sudo apt-get upgrade
  * Check pid of ceph-osd (after upgrade)

  If the pid changes, it means ceph-osd has been restarted, and the
  restart or stop/start has been exercised.

  [Potential Regression]

  Low, the desire is to control the precise timing of the restart.

  The larger context is that there may multiple updates (in this case
  kernel) and one want a single stop/start when the reboot occurred, not
  2 (1 due to ceph postinst and 1 for the reboot (to load new kernel)
  for instance).

  The goal is for the admin to choose when (and which) ceph services
  move to the new code level, after upgrading the package.

  [Other Information]

  Ubuntu ceph package uses a more modern version of dh (10) as oppose to
  ceph upstream which uses dh 9[0]. Ceph package also doesn't exclude
  any ceph services like Ubuntu does[1]

  Upstream ceph doesn't have the restart behaviour because they are not
  there yet (dh 10),but they are likely to take the same road as we do
  as they upgrade debhelper.

  [0] https://github.com/ceph/ceph/blob/master/debian/control#L15
  [1] https://github.com/ceph/ceph/blob/master/debian/rules#L86

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