[Bug 1876325] Re: ceph-mgr-dashboard: missing dependency on python3-yaml

[Chris MacNaughton]

After installing Ceph on a focal machine, I could not reproduce this
issue as I already had python3-yaml installed on the machine. To rule
out deployment tooling installing python3-yaml, I started to remove it
and discovered that there are a lot of dependencies on python3-yaml:

# sudo apt remove python3-yaml
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following package was automatically installed and is no longer required:
  libnetplan0
Use 'sudo apt autoremove' to remove it.
The following packages will be REMOVED:
  cloud-init netplan.io python3-yaml ubuntu-advantage-tools ubuntu-minimal

The ceph-mgr-dashaboard package is missing a dependency on python3-yaml
so there is a fix proposed to the Ubuntu package
(https://code.launchpad.net/~chris.macnaughton/ubuntu/+source/ceph/+git/ceph/+merge/383332)
and there is a package in
https://launchpad.net/~chris.macnaughton/+archive/ubuntu/focal-ussuri
off of the linked merge proposal.

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https://bugs.launchpad.net/bugs/1876325

Title:
  ceph-mgr-dashboard: missing dependency on python3-yaml

Status in ceph package in Ubuntu:
  New

Bug description:
  As reported on ceph-users:

  Duncan Bellamy XXXXX via ceph.io

  Hi,
  I have installed ceph on Ubuntu Focal Fossa using the ubuntu repo, instead of ceph-deploy (as ceph-deploy install does not work for Focal Fossa yet)  install I used:
  sudo apt-get install -y ceph ceph-mds radosgw ceph-mgr-dashboard

  The rest of the setup was the same as the quickstart on ceph.io
  <http://ceph.io/> with ceph-deploy.

  It installed ceph version 15.2.1 (octopus).

  If I do a 'ceph -s' I get the warning:
  health: HEALTH_WARN
              2 mgr modules have failed dependencies

  If I run 'ceph mgr module ls', for enabled and active modules I get:

   "always_on_modules": [
          "balancer",
          "crash",
          "devicehealth",
          "orchestrator",
          "osd_support",
          "pg_autoscaler",
          "progress",
          "rbd_support",
          "status",
          "telemetry",
          "volumes"
      ],
      "enabled_modules": [
          "iostat",
          "restful”

  Then when I run 'ceph mgr module enable dashboard’ I get the error:

  Error ENOENT: module 'dashboard' reports that it cannot run on the
  active manager daemon: No module named 'yaml' (pass --force to force
  enablement)

  I have tried searching, and searching with apt but cannot find any
  ‘yaml’ package that might be used by ceph.

  Duncan

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