Ceph Nautilus to Octopus
This article explains how to upgrade Ceph from Nautilus to Octopus (15.2.3 or higher) on Proxmox VE 6.x.
For more information see Release Notes
We assume that all nodes are on the latest Proxmox VE 6.3 (or higher) version and Ceph is on version Nautilus (14.2.9-pve1 or higher). If not see the Ceph Luminous to Nautilus upgrade guide.
|Note: It is not possible to upgrade from Ceph Luminous to Octopus directly.|
The cluster must be healthy and working!
- During the upgrade from Nautilus to Octopus the first time each OSD starts, it will do a format conversion to improve the accounting for “omap” data. This may take a few minutes to as much as a few hours (for an HDD with lots of omap data).
Preparation on each Ceph cluster node
NOTE: Currently (July 2020) the packages are not yet available on the "main" repository, only on the "test" one.
Change the current Ceph repositories from Nautilus to Octopus.
sed -i 's/nautilus/octopus/' /etc/apt/sources.list.d/ceph.list
Your /etc/apt/sources.list.d/ceph.list should look like this
deb http://download.proxmox.com/debian/ceph-octopus buster main
Set the 'noout' flag
Set the noout flag for the duration of the upgrade (optional, but recommended):
ceph osd set noout
Or via the GUI in the OSD tab (Manage Global Flags).
Upgrade on each Ceph cluster node
Upgrade all your nodes with the following commands. It will upgrade the Ceph on your node to Octopus.
apt update apt full-upgrade
After the update you still run the old Nautilus binaries.
Restart the monitor daemon
|Note: You can use the web-interface or the command-line to restart ceph services.|
After upgrading all cluster nodes, you have to restart the monitor on each node where a monitor runs.
systemctl restart ceph-mon.target
Once all monitors are up, verify that the monitor upgrade is complete. Look for the Octopus string in the mon map. The command
ceph mon dump | grep min_mon_release
min_mon_release 15 (octopus)
If it does not, this implies that one or more monitors haven’t been upgraded and restarted, and/or that the quorum doesn't include all monitors.
Restart the manager daemons on all nodes
Then restart all managers on all nodes
systemctl restart ceph-mgr.target
Verify that the ceph-mgr daemons are running by checking ceph -s
... services: mon: 3 daemons, quorum foo,bar,baz mgr: foo(active), standbys: bar, baz ...
Restart the OSD daemon on all nodes
Important: After the upgrade, the first time each OSD starts, it will do a format conversion to improve the accounting for “omap” data. It may take a few minutes or up to a few hours (eg. on HDD with lots of omap data).
Best to restart the OSDs on one node at a time after
systemctl restart ceph-osd.target
Wait after each restart and periodically checking the status of the cluster:
It should be in HEALTH_OK or
HEALTH_WARN noout flag(s) set
You can disable this automatic conversion with:
ceph config set osd bluestore_fsck_quick_fix_on_mount false
But the conversion should be made as soon as possible.
Disallow pre-Octopus OSDs and enable all new Octopus-only functionality
ceph osd require-osd-release octopus
NOTE: Missing this step breaks starting OSD from which have their required release on Ceph Luminous or older (for example, if you upgraded from Luminous -> Nautilus -> Octopus)
Upgrade all CephFS MDS daemons
For each CephFS file system,
- Reduce the number of ranks to 1 (if you plan to restore it later, first take notes of the original number of MDS daemons).:
ceph status ceph fs set <fs_name> max_mds 1The default installation uses one active MDS. To check if this is the case on your cluster, check the output of ceph status and very that there is only one active MDS.
- Wait for the cluster to deactivate any non-zero ranks by periodically checking the status:
- Take all standby MDS daemons offline on the appropriate hosts with:
systemctl stop ceph-mds.target
- Confirm that only one MDS is online and is on rank 0 for your FS:
- Upgrade the last remaining MDS daemon by restarting the daemon:
systemctl restart ceph-mds.target
- Restart all standby MDS daemons that were taken offline:
systemctl start ceph-mds.target
- Restore the original value of max_mds for the volume:
ceph fs set <fs_name> max_mds <original_max_mds>
Unset the 'noout' flag
Once the upgrade process is finished, don't forget to unset the noout flag.
ceph osd unset noout
Or via the GUI in the OSD tab (Manage Global Flags).
If your CRUSH tunables are older than Hammer, Ceph will now issue a health warning. If you see a health alert to that effect, you can revert this change with:
ceph config set mon mon_crush_min_required_version firefly
If Ceph does not complain, however, then we recommend you also switch any existing CRUSH buckets to straw2, which was added back in the Hammer release. If you have any ‘straw’ buckets, this will result in a modest amount of data movement, but generally nothing too severe:
# create a backup first ceph osd getcrushmap -o backup-crushmap ceph osd crush set-all-straw-buckets-to-straw2
If there are problems, you can easily revert with:
ceph osd setcrushmap -i backup-crushmap
Moving to ‘straw2’ buckets will unlock a few recent features, like the crush-compat balancer mode added back in Nautilus.
Enable msgrv2 protocol and update Ceph configuration
If you did not already do so when you upgraded to Nautilus, we recommend enabling the new v2 network protocol. Issue the following command:
ceph mon enable-msgr2
This will instruct all monitors that bind to the old default port 6789 for the legacy v1 protocol to also bind to the new 3300 v2 protocol port. To see if all monitors have been updated run
ceph mon dump
and verify that each monitor has both a v2: and v1: address listed.
Placement Group (PG) count warning for pools
The PG autoscaler feature, introduced in Nautilus, is enabled for new pools by default, allowing new clusters to auto-tune pg num without any user intervention.
You may want to enable the PG autoscaler for upgraded pools. It is advisable to check the recommendation of the autoscaler before activation. And additionally see the discussion on the forum Ceph Octopus upgrade notes - Think twice before enabling auto scale.
ceph osd pool set POOLNAME pg_autoscale_mode on
Be aware that enabling the PG autoscaler will trigger recovery on merging/splitting PGs. This will result in higher load and resource usage, you should enable it one pool at a time.