Reboot a node in cluster with 2 nodes

[Miro_I]

Hello,
I have a cluster of 2 Proxmox nodes and experienced strange situation today.

I wanted to simulate unclean node failure and rebooted one of the nodes with command "reboot 0" and the other node also rebooted.
Why the other node rebooted at all?

 

[UdoB]

"The other node" lost connectivity to the first node when you rebootet that one. It was alone then, as a single surviving node. But it does not know that! The expected behavior in that situation for it is to "fence" itself - by rebooting.

Look into the documentation and search for "quorum" and especially for one possible solution by establishing a "qdevice"...

Best regards