[Bug 1700382] Re: Boot times slow when LXD installed, due to poorly crafted systemd dependency chain

[Julian Andres Klode]

Also, well network.target is pulled in by a lot of stuff, and ifup is
just slow unless you specify allow-hotplug for your interfaces;
unrelated to network-online.target or lxd.

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Title:
  Boot times slow when LXD installed, due to poorly crafted systemd
  dependency chain

Status in systemd package in Ubuntu:
  New

Bug description:
  Notice the time spent inside lxd-containers.service + lxd.service
  which require network + disk subsystems to work before they can work.

  This behavior can be recreated by installing + configuring LXD, with
  no containers.

  Both lxd-containers.service + lxd.service should be run asynchronously
  or at end of boot process.

  Boot should never hang waiting on these to finish.

  Fixing this, will reduce boot time by 20secs or 10% of total boot time for this machine.
  _______

  net11 # systemd-analyze critical-chain
  The time after the unit is active or started is printed after the "@" character.
  The time the unit takes to start is printed after the "+" character.

  graphical.target @1min 16.744s
  └─multi-user.target @1min 16.744s
    └─lxd-containers.service @58.554s +18.188s
      └─lxd.service @1min 14.295s +2.457s
        └─network-online.target @1min 14.285s
          └─network.target @1min 14.280s
            └─ifup at eth2.service @55.020s
              └─network-pre.target @54.598s
                └─ebtables.service @50.416s +2.106s
                  └─local-fs.target @50.212s
                    └─var-lib-lxd-devlxd.mount @1min 16.572s
                      └─local-fs-pre.target @48.449s
                        └─lvm2-monitor.service @48.004s +220ms
                          └─lvm2-lvmetad.service @46.720s
                            └─system.slice @18.745s
                              └─-.slice @2.783s

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