During the intial setup for PCNS, you're asked to verify various things about your network configuration. One of those things is your hostname.
I deployed PCNS in two instances today and have found that the hostname and domain settings do not survive a reboot. I discovered this because I wanted to change the hostname earlier today on a brand new install. I looked up how to change it on CentOS (which is what powers the PCNS appliance) and made changes there. Those changes did not stick after a reboot.
Since it was a brand new installation without anything much done to it, I blew the VM away and reinstalled from scratch. As usual, I verified the hostname during the first bootup. This time, I rebooted after I ran the PowerChute Network Shutdown configuration wizard and the hostname reset again to localhost.locdomain.
How can I stop this from occurring?
I just figured it out!
I was pointing DNS at my Windows DNS server and without an associated PTR record, the hostname wasn't retained. I just created both the A record and the associated PTR record with the desired hostname, rebooted PCNS and it's now correct!
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