"_" is not permitted in RHEL 9 hostname
Issue
- Unable to use the underscore "_" in RHEL9 hostname,but it did work in RHEL7 and RHEL8.
# hostnamectl hostname rhel9_example
# hostname
rhel9example
Environment
- Red Hat Enterprise Linux 9
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.
