WS Proxmox node reboot
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Tips & Notes
- If you're expecting to reboot every node in the cluster, do the node with the containers last, to limit the amount of downtime and reboots for them
- Updating a node: `apt update` and `apt full-upgrade`
- Make sure all VMs are actually migratable before adding to a HA group
- If there are containers on the device you are looking to reboot- you are going to need to also create a maintenance mode to cover them (for example teamspeak or awstats)
- Containers will inherit the OS of their host, so you will also need to handle triggers related to their OS updating, where appropriate
Pre-Work
- If a VM or container is going to incur downtime, you must let the affected parties know in advance. Ideally they should be informed the previous day.
Pre-flight checks
- Check all Ceph pools are running on at least 3/2 replication
- Check that all running VM's on the node you want to reboot are in HA (if not, add them or migrate them away manually)
- Check that Ceph is healthy -> No remapped PG's, or degraded data redundancy
- You have communicated that downtime is expected to the users who will be affected (Ideally one day in advance)
Update Process
- Update the node: `apt update` and `apt full-upgrade`
- Check the packages that are removed/updated/installed correctly and they are the sane (to make sense)
Reboot process
- Complete the pre-flight checks
- If you want to reboot for a kernel update, make sure the kernel is updated by following the Update Process written above
- Start maintenance mode for the Proxmox node and any containers running on the node
- Start maintenance mode for Ceph, specify that we only want to surpress the trigger for health state being in warning by setting tag `ceph_health` equals `warning`
- Let affected parties know that the mainenance period you told them about in the preflight checks is about to take place.
- Set noout flag on host: `ceph osd set-group noout <node>`
- gain ssh access to host
- Log in through IPA
- Run the command
- Reboot node through web GUI
- Wait for node to come back up
- Wait for OSD's to be back online
- Remove noout flag on host: `ceph osd unset-group noout <node>` ,to do this:
- If a kernel update was done, manually execute the `Operating system` item manually to detect the update. Manually executing the two items that indicate a reboot is also usefull if they were firing, to stop them/check no further reboots are needed.
- Ackowledge & close triggers
- Remove maintenance modes
Aftercare
- Ensure that Kaboom API is running on Screwdriver or Paloma. This is to get the best performance for the VM.