Maintenance mode explanations

[baalkor]

Hi all,

Could someone help me understand the following statments taken from https://pve.proxmox.com/wiki/High_Availability : "
1. Sometimes it is necessary to perform maintenance on a node, such as replacing hardware or simply installing a new kernel image. This also applies while the HA stack is in use.
2. for maintenance that does not require a shutdown or reboot, or that should not be switched off automatically after only one reboot, you can enable the manual maintenance mode."

=> Installing new kernel requires a reboot, so the two sentences seems a bit opposite in their sense or am I missing a subtle difference ?
=> Can we use the maintenance mode to perform update such as 9.0 -> 9.1 to ensure no VM is running on the host beeing updated, the same way we did with vSphere ?
=> Can you explain me the second point I don't get it ?

Thanks in advance.

 

[Johannes S]

=> Installing new kernel requires a reboot, so the two sentences seems a bit opposite in their sense or am I missing a subtle difference ?

The gist is that if you reboot or shutdown a node the node any vm which is a ha resource with migrate policy will be migrated to another node.
If for whatever reason you need to enable the maintenance-node without reboot you can enable it manually.

=> Can we use the maintenance mode to perform update such as 9.0 -> 9.1 to ensure no VM is running on the host beeing updated, the same way we did with vSphere ?

Yes, this should work.

As Sohn as the reboot is finished or you disable maintenance-mode the migrated vm will be moved back.