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All our hosts are registered in an Infoblox DHCP+DNS service as MAC+IP+hostname. We have two one domains and one subdomain.
When we kickstart-install a new RHEL7 host on the main domain, it cleanly gets its intended hostname from Infoblox/DNS. We can see this very early on by doing an Alt-F2 and querying the hostname. All is well.
But on the subdomain it gets the name "localhost.localdomain" (which seems to be the "in the absence of anything else" default).
A wireshark trace of installations shows a DHCP request and ack. On the main domain this is quickly followed by a DNS PTR query from the host, giving the host's IP address and successfully returning the host's hostname. By contrast, on the subdomain, this
query is never initiated. (On both domains, there are subsequent successful DNS queries of other things as part of the ensuing installation, demonstrating that DNS activity is happening.)
What might be triggering the hosts on the two different domains to behave differently, that is, send or not send that DNS/PTR query?
Looking deeper into that preceding DHCP request/ACK: The main domain, where all works well, is (for example) "company.org". The subdomain (where this lack of hostname issue arises) is a subdomain, e.g. "sub.company.org". One oddity I spotted, is that the
DHCP/ACK returns the same "domain-name" option-15 "company.org" for both. I wonder if that is precipitating a subsequent problematical behaviour in that "sub.company.org" context?
Any thoughts? Thanks.
-- David Lee
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