[Bug 2045828] Re: rbd-target-{api, gw}.service doesn't start after a reboot

[Nobuto Murata]

> To defer it to systemd. However, the package doesn't leverage
dh_installsystemd with --no-enable and --no-start. Instead, it uses
debian/ceph-iscsi.install to manually copy
usr/lib/systemd/system/*.service to the system.

I think this is based on the previous upstream documentation.
https://github.com/ceph/ceph-iscsi/blob/97f5b02107ce891360a9741e068a2ec564185154/README#L123-L128

And the new README.md refers to systemctl enable.
https://github.com/ceph/ceph-iscsi/blob/97f5b02107ce891360a9741e068a2ec564185154/README.md?plain=1#L52-L64

In any case, the charm can make sure it's enabled after writing the
config.

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https://bugs.launchpad.net/bugs/2045828

Title:
  rbd-target-{api,gw}.service doesn't start after a reboot

Status in OpenStack Ceph iSCSI Charm:
  New
Status in ceph-iscsi package in Ubuntu:
  New

Bug description:
  ceph-iscsi              quincy/stable   28

  $ apt policy ceph-iscsi
  ceph-iscsi:
    Installed: 3.5-2ubuntu1
    Candidate: 3.5-2ubuntu1
    Version table:
   *** 3.5-2ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
          100 /var/lib/dpkg/status

  How to reproduce:
  once the ceph-iscsi charm is deployed with 2 units per the documentation, reboot one of the units.

  # systemctl status rbd-target-gw.service
  ○ rbd-target-gw.service - Setup system to export rbd images through LIO
       Loaded: loaded (/lib/systemd/system/rbd-target-gw.service; disabled; vendor preset: enabled)
       Active: inactive (dead)

  # systemctl status rbd-target-api.service
  ○ rbd-target-api.service - Ceph iscsi target configuration API
       Loaded: loaded (/lib/systemd/system/rbd-target-api.service; disabled; vendor preset: enabled)
       Active: inactive (dead)

  This is probably because the systemd services are disabled.

  # systemctl is-enabled rbd-target-{api,gw}.service
  disabled
  disabled

  A possible workaround is to enable those services by hand.

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