On 1/26/22 16:48, Samuel Sieb wrote:
I think I figured out what he's doing and I'm kind of surprised that it works at all. He's expecting the system to use its IP address to lookup its hostname. That seems wrong. Maybe what is working is that the installer does that lookup and sets the hostname during the install. But that setting has become transient for some reason (which I think I've noticed, but didn't investigate). The DCHP server is the one that's supposed to be supplying the hostname.
Linux has used the reverse DNS name for name resolution for EVER. Again, see https://youtu.be/pAVNwwrHwkw to see that every version of RHEL has used reverse DNS since RHEL 4. I also tested against older versions of Fedora, and it has ALWAYS used reverse DNS for hostname resolution.
In older versions of RHEL and pre-Fedora 33, the hostname was set via the contents of e.g. /etc/sysconfig/network-scripts/network-functions and /etc/rc.d/rc.sysinit.
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