Testing phase 2 - three machine all-in-one deploy.

Deployed using eoan - mon,mgr and 1 x osd on each machine

Deployment seeded with pools a lightweight test data - rbd's in each
pool.

Each machine upgraded in turn (1,2 and then 0) using do-release-upgrade.

ceph versions checked throughout deployment - mixed versions observered.

OSD's booted OK after machine reboots post do-release-upgrade.

During upgrade process:

$ sudo ceph mon dump | grep min_mon_release
dumped monmap epoch 1
min_mon_release 14 (nautilus)

$ sudo ceph versions
{
    "mon": {
        "ceph version 14.2.8 (2d095e947a02261ce61424021bb43bd3022d35cb) 
nautilus (stable)": 1,
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 2
    },
    "mgr": {
        "ceph version 14.2.8 (2d095e947a02261ce61424021bb43bd3022d35cb) 
nautilus (stable)": 1,
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 2
    },
    "osd": {
        "ceph version 14.2.8 (2d095e947a02261ce61424021bb43bd3022d35cb) 
nautilus (stable)": 1,
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 2
    },
    "mds": {},
    "overall": {
        "ceph version 14.2.8 (2d095e947a02261ce61424021bb43bd3022d35cb) 
nautilus (stable)": 3,
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 6
    }
}

Post upgrade of last machine:

$ sudo ceph mon dump | grep min_mon_release
dumped monmap epoch 2
min_mon_release 15 (octopus)

$ sudo ceph versions
{
    "mon": {
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 3
    },
    "mgr": {
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 3
    },
    "osd": {
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 3
    },
    "mds": {},
    "overall": {
        "ceph version 15.2.1 (9fd2f65f91d9246fae2c841a6222d34d121680ee) octopus 
(stable)": 9
    }
}

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https://bugs.launchpad.net/bugs/1874939

Title:
  ceph-osd can't connect after upgrade to focal

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