On Wed, 2022-01-26 at 14:48 -0800, 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.
I don't see why that's wrong, there were plenty of things that discover their hostname by doing a reverse look-up of their IP. And he demonstrated several releases that worked exactly that way. The inverse of that was there were plenty of things that would foul up if the reverse lookup of their IP didn't work, or came up with different answers than expected. I remember coming across this in the past when setting up HTTP servers, mail servers, etc. Apache springs to mind, in particular, it would work out its hostname via reverse IP lookups if you don't manually set it in the Apache configuration (it doesn't find out its hostname from the host's hostname). * DHCP can accept a hostname from a client, but it doesn't have to. * DHCP can give a hostname to a client, but it doesn't have to, and the client doesn't have to accept it. * A host can find out its hostname from its IP address. I recall having to specify how many dots to count to separate hostname from domain name (e.g. if you were fred.bargle.flargle.net.au, your domain name could bargle.flargle.net.au or flargle.net.au, and therefore there were two possibilities of what your hostname might be). A particular advantage of having the host and domain names being worked out from polling your DNS server is that the details will be consistent with what everything else thinks you are. -- uname -rsvp Linux 3.10.0-1160.53.1.el7.x86_64 #1 SMP Fri Jan 14 13:59:45 UTC 2022 x86_64 Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
