Him
you mostly answered all your questions yourself correctly :) Only reason
why there is no multiple links supported (yet) is really it is not
implemented - it's one of todo
(https://github.com/corosync/corosync-qdevice/issues/23). Also you are
right, it is less reliable than having full third node, but it can be
used by multiple clusters (full third node cannot be used that way).
Also if qnetd is outside cluster network (= closer to customer of
service provided by cluster) it can be used as decision maker what
cluster partition is "better" (reachable by customer). In short, having
just one cluster using qnetd inside cluster network is perfectly valid
and possible use-case, but it's not really what qnetd primary purpose is
(multiple, mostly 2-node, clusters, qnetd running on 3rd site).
Regards
Honza
On 01/10/2025 05:06, Paul B. Henson via Users wrote:
Hmm, I dug around the source code a bit after sending my first message.
The proxmox documentation says to use an IP address when adding a
qdevice:
https://www.proxmox.com/images/download/pve/docs/pve-admin-guide-9.0.pdf
"pvecm qdevice setup <QDEVICE-IP>"
The qdevice only supports a single "Host" option, but it seems if you
specify an actual hostname and not an IP address it tries all of the IP
addresses associated with that hostname when connecting, and if a
connection fails, it tries them all again?
So it appears you can use a qdevice with redundancy across multiple
network links and different subnets, but only if you configure it with a
hostname that resolves to multiple IP addresses as opposed to
configuring with a single IP address?
I don't think I'd want to involve dns in cluster config, but I suppose
adding a qdevice name with multiple IP addresses to the hosts file on
each node would work.
I'll have to test this...
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