I'm setting up a Red Hat AS3 and having issues with hostname. The hostname is set and when I run $hostname I get the correct reply (server.domain.com), however if I run any of the flagged hostname commands like $hostname -a or -f or -d I get Unkown host. The domainname is not set currently but I had it set previously (domain.com) and the hostname just as the server name (server) but the flagged hostname commands still did not work. Any ideas what the issue is? Also should hostname be set as the fully qualified name of just the server name with the domain name to create the fully qualified name?

What does /proc/sys/kernel/hostname and /etc/hosts say ?

[aobrien]$ more /proc/sys/kernel/hostname
ino4w308.ad.bank.net
[aobrien]$ more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost

Your /etc/hosts looks messed up and should be fixed. Also the hostname in /proc/sys/kernel/hostname should NOT be FQDN. You need to check your configuration files; for RedHat this is probably /etc/sysconfig/network or something alike.

Thanks Markus, that was it. /etc/hosts was missing a line for my server...

[aobrien]$ more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
153.110.151.60 ino4w308.ad.bank.net ino4w308