[SOLVED] Cluster nodes are up to date but do not use same kernel version

[Damien_vo]

Hello

I think, the title is straightforward.

I have just done an update on four cluster nodes, they all are up to date but the running kernels are not the same.

node1:~# pveversion -v
proxmox-ve: 5.4-1 (running kernel: 4.15.17-1-pve)
pve-manager: 5.4-3 (running version: 5.4-3/0a6eaa62)
pve-kernel-4.15: 5.3-3
pve-kernel-4.15.18-12-pve: 4.15.18-35
pve-kernel-4.15.18-11-pve: 4.15.18-34
pve-kernel-4.15.18-9-pve: 4.15.18-30
pve-kernel-4.15.17-1-pve: 4.15.17-9

node2:~# pveversion -v
proxmox-ve: 5.4-1 (running kernel: 4.15.18-11-pve)
pve-manager: 5.4-3 (running version: 5.4-3/0a6eaa62)
pve-kernel-4.15: 5.3-3
pve-kernel-4.15.18-12-pve: 4.15.18-35
pve-kernel-4.15.18-11-pve: 4.15.18-34
pve-kernel-4.15.18-9-pve: 4.15.18-30
pve-kernel-4.15.17-1-pve: 4.15.17-9

node3:~# pveversion -v
proxmox-ve: 5.4-1 (running kernel: 4.15.18-9-pve)
pve-manager: 5.4-3 (running version: 5.4-3/0a6eaa62)
pve-kernel-4.15: 5.3-3
pve-kernel-4.15.18-12-pve: 4.15.18-35
pve-kernel-4.15.18-11-pve: 4.15.18-34
pve-kernel-4.15.18-9-pve: 4.15.18-30
pve-kernel-4.15.17-1-pve: 4.15.17-9

node4:~# pveversion -v
proxmox-ve: 5.4-1 (running kernel: 4.15.17-1-pve)
pve-manager: 5.4-3 (running version: 5.4-3/0a6eaa62)
pve-kernel-4.15: 5.3-3
pve-kernel-4.15.18-12-pve: 4.15.18-35
pve-kernel-4.15.18-11-pve: 4.15.18-34
pve-kernel-4.15.18-9-pve: 4.15.18-30
pve-kernel-4.15.17-1-pve: 4.15.17-9

I want the nodes to take the last kernel available.
Am I forced to reboot them ?

 

[t.lamprecht]

I have just done an update on four cluster nodes, they all are up to date but the running kernels are not the same.

You need to reboot to run any new kernel.

 

[t.lamprecht]

Am I forced to reboot them ?

In general yes, there are some ways of live patching it, but it works not always and mostly provided by external services, not us.
Normally, you free up a node (migrate all important VMs and CTs away to another one) and then reboot it, do this for all nodes in a cluster and you can achieve a downtime-free kernel upgrade (at least with VMs).

 

[Damien_vo]

Thank you for your fast answer ! Then I will reboot them