Proxmox HA Design Questions

[Irre Levant]

Hello,

i became aware of proxmox last weekend, played around with it in virtualbox and immediately fell in love with it (sorry for being late).

I think I would like to set up hardware with it.
I want to achieve the following:

- make use of snapshots for vms
- have redundancy (if a node goes down, the vms should still be accessible after a short interruption)
- the user data of the vms should be on a external nfs share so that I can also use it outside of proxmox

Attached a sketch for what is in my mind. Would you recommend this for my low budget home project or do you see any major stumbling blocks or nogoes? If you have alternatives, please write down your reasons. Thanks for your toughts!

 

[Folke]

Hi,
you probably should have a third node in your cluster that could decide a vote if one of your nodes goes down. This doesn't have to be a full proxmox instance though, you could set up a external vote agent [0]. Without that you might get into a split brain situation if the nodes loose connection to each other.

[0] https://pve.proxmox.com/wiki/Cluster_Manager#_corosync_external_vote_support

 

[Irre Levant]

Hi Folke,

thanks for your reply. Ok i see so as far as i understood i can install the corosync-qnetd package at the NAS/NFS machine and check the state of both nodes over the 1GbE switch so that even the 2,5GbE switch can go down without having split brain? I will give it a try at my virtualbox in the afternoon.

 

[Irre Levant]

hm, this did worked somehow but with loosing my second ring between the nodes:
forum post