[Bug 2033428] Re: [FFe] Update Ceph to new 18.2.0 (Reef) version

[Luciano Lo Giudice]

It's been pointed out that the above test plan isn't sufficient since it
uses jammy-reef instead of mantic-reef. Since deploying Mantic machines
on Juju isn't supported yet, here's an alternative test plan using
cephadm:

First, we create a Mantic VM using LXD.

```
# The Mantic images aren't included by default, so download it first
lxc image copy images:ubuntu/mantic local: --copy-aliases --vm
lxc launch ubuntu/23.10 admin --vm -c limits.cpu=4 -c limits.memory=16GiB
# Jump into the VM
lxc exec admin /bin/bash
```

Now that we are in the VM, we install the necessary packages and add our
PPA:

```
apt install -y openssh-server software-properties-common && systemctl enable ssh --now
add-apt-repository ppa:lmlogiudice/ceph-reef-mantic
apt update
```

With the PPA in place, we now install Ceph and cephadm:

```
apt install ceph cephadm
```

Before proceeding, we verify that the Ceph version is the expected one:

```
root at admin:~# ceph -v
ceph version 18.2.0 (5dd24139a1eada541a3bc16b6941c5dde975e26d) reef (stable)
```

Afterwards, we bootstrap the Ceph cluster:

`cephadm bootstrap --mon-ip 10.122.104.220 --single-host-defaults
--cluster-network=10.122.104.0/24`

(Replace with your IP where necessary)

With this done, we have a Ceph cluster, but no OSD's. We can add one
with the following steps:

```
touch loop.img
truncate --size 3G ./loop.img
losetup -fP ./loop.img
losetup -a
```

Assuming the loop device has been mounted in the path `/dev/loop0`, we
proceed with the following:

`ceph orch daemon add osd `hostname`:/dev/loop0 raw`

And with that, we have an OSD ready, which we can verify by running:

`ceph -s`

which should show something like:

  cluster:
    id:     37ff43ae-4d08-11ee-b0f8-00163e4c7d50
    health: HEALTH_WARN
            OSD count 1 < osd_pool_default_size 2
 
  services:
    mon: 1 daemons, quorum admin (age 11m)
    mgr: admin.ybcvya(active, since 9m), standbys: admin.aksuhv
    osd: 1 osds: 0 up, 1 in (since 26s)
 
  data:
    pools:   0 pools, 0 pgs
    objects: 0 objects, 0 B
    usage:   0 B used, 0 B / 0 B avail
    pgs:

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https://bugs.launchpad.net/bugs/2033428

Title:
  [FFe] Update Ceph to new 18.2.0 (Reef) version

Status in ceph package in Ubuntu:
  Triaged
Status in ceph source package in Mantic:
  Triaged

Bug description:
  Hello,
  The release of Ceph Reef [0] was delayed and didn't happen before the feature freeze in Mantic.

  Reef includes fixes and features that are important to our community
  and us, so we would like to include it in the Ubuntu Mantic release.

  Our plan is to upload a package based on this PPA [1], corresponding
  to the following git branch [2] if the FFe is accepted and the package
  and sources pass their review.

  0: https://docs.ceph.com/en/latest/releases/reef/
  1: https://launchpad.net/~lmlogiudice/+archive/ubuntu/ceph-reef-mantic
  2: https://git.launchpad.net/~lmlogiudice/ubuntu/+source/ceph/log/?h=mantic-reef-18.2.0

  Please let us know if you need any additional details.

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