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this post was submitted on 18 Nov 2023
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I run everything on a 2 node proxmox cluster with ZFS mirror volumes and replication of the VMs and CTs between them, run PBS with hourly snapshots, and sync that to multuple USB drives I swap off site.
The docker VM can be ZFS snapshotted before major updates so I can rollback.
You should get another node, otherwise when node1 fails node2 will reboot itself and then do nothing because it has no quorum
pvecm expected 1I know, but every time I had to do that it felt like it's a jank solution. If you have a raspberry pi or smth like that you can also set it up as a qdevice.
...and if you're completely fine with how it is you can also just leave it like it is
So I started to write a reply that said basically that I was OK doing that manually, but thought that "hell, I have a PBS box on the network that would do that fine". So it took about 3 minutes to install the corosync-qdevice packages on all three and enable it. Good to go.
Thanks for the kick in the ass.
So since I now had a "quorate" cluster again, I thought I'd try out HA. I'd always been under the impression that unless you had a shared storage LUN, you couldn't HA anything. But I thought I'd trigger a replication and then down the 2nd node just as a test. And lo and behold, the first node brought up my OPNsense VM from the replicated image about 2 minutes after the second node lost contact, and internet starts working again.
I'm really excited about having that feature working now. This was a good night, thank you.
If you need another thing to do, you could try to make your opnsense HA and never have your internet stop working while rebooting a node. It's pretty simple to set up, you might finish it in 1-2 evenings. Happy clustering!
I'll look into that. I did see the option in opnsense once upon a time but never investigated it.