On Sun, 5 Feb 2017, Tim Richards wrote:
Setup: Active/Passive Two Node Cluster. Two UPSes (APC Smart-UPS 1500 C)
with USB communication cables cross connected (ie UPS-webserver1
monitored by webserver2, and vice versa) to allow for stonith/fencing
OS OpenSuse Leap 42.2
NUT version 2.7.1-2.41-x86_64
Fencing agent: external/nut
Problem: When power fails to a single UPS, both nodes are shutdown. The
node with the still powered UPS comes back up, but requires manual
intervention to keep it providing services. I would like only the node
with the “On Battery” UPS to shutdown.
I think your title hints at the solution. What is the advantage of the
cross-connection of the UPS units? Wouldn't it be simpler to have each
node connected to the UPS which supplies the power? This is easier to set
up, extends easily to n servers, and is independent of the stonith/fencing
which I assume you use for other purposes.
The resupply of services problem seems to be that NUT on the node that
comes back up will not restart until the other node restarts.
With a simpler setup, this problem should go away.
Roger
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