[Bug 1575572] Re: apache2 fails to start if installed via cloud config (on Xenial)

[Martin Pitt]

Indeed this isn't related to native systemd units vs. sysvinit scripts.

> honor this historical behavior by making the 'runlevel' command return
the target runlevel when called from a systemd unit that's run at boot,
even if that target has not yet been reached.

OK, I wasn't aware of that. I'll look into that.

> d.) output of runlevel is stored in RL and then it goes looking for an
SLINK or SSLINK (/etc/rc$RL.d/S??apache2 or /etc/rcS.d/S??apache2).
Neither of these exist so it exits without starting the service.

To be sure we are talking about the same thing: Surely update-rc.d
should run before invoke-rc.d in the postinst, so the links should exist
in rc[2345].d/. This is solely about $RL having the wrong value here,
not about the links not existing at all, right?

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Title:
  apache2 fails to start if installed via cloud config (on Xenial)

Status in cloud-init package in Ubuntu:
  Confirmed
Status in init-system-helpers package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  Using the following cloud config, apache2 will fail to start on
  installation on Xenial:

  #cloud-config
  packages:
  - apache2

  See for example:

  $ gcloud compute instances create xenial-$(date +%y%m%d-%H%M) --image ubuntu-1604-xenial-v20160420c --image-project ubuntu-os-cloud --metadata-from-file user-data=cloud-config
  NAME                ZONE            MACHINE_TYPE   PREEMPTIBLE  INTERNAL_IP  EXTERNAL_IP    STATUS
  xenial-160427-1050  europe-west1-d  n1-standard-1               10.240.0.7   104.155.86.94  RUNNING

  $ ssh ubuntu at 104.155.86.94 systemctl status apache2.service
  ● apache2.service - LSB: Apache2 web server
     Loaded: loaded (/etc/init.d/apache2; bad; vendor preset: enabled)
    Drop-In: /lib/systemd/system/apache2.service.d
             └─apache2-systemd.conf
     Active: inactive (dead)
       Docs: man:systemd-sysv-generator(8)

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