If you are using DHCP to receive IP Address for your Sun Solaris system, you may end up with no hostname assigned to the system. This can be confirmed when there is no hostname at the prompt or if the output for the command “hostname” is as follows:
or the /etc/hosts file has an entry as follows:
# cat /etc/hosts
# Internet host table
192.168.0.3 unknown # Added by DHCP
This happens when the DHCP server doesn’t provide a hostname for your server. Most of the DHCP Servers or routers acting as a DHCP Server doesn’t provide a hostname and Solaris DHCP agent relies on the DHCP server for its hostname.
To fix this problem, edit the dhcpagent config and set it not to request a Hostname from the DHCP server and then add a hostname to the /etc/hosts & /etc/nodename file.
Edit DHCPAGENT config
[For Solaris 10, this is not required as setting the hostname in /etc/nodename overrides the hostname provided by the DHCP Server. Move onto the next step]
Edit the dhcpagent config file /etc/default/dhcpagent with your favorite editor
# vi /etc/default/dhcpagent
and look for
and remove the Parameter “12” from the above to look as follows:
and save the file.
Now, add the hostname to the /etc/nodename & /etc/hosts as follows
# vi /etc/nodename
and add the hostname you want it to have (solarisserver for me)
# cat /etc/nodename
and edit the /etc/hosts file
# vi /etc/hosts
and add the line similar to the following
192.168.0.3 solarisserver loghost
Now,reboot the server and you should be all fine with hostname set for the system.
# init 6
9 thoughts on “Fix: No hostname when using DHCP in Sun Solaris 8/9/10”
I tried the steps given in this article.
But the problem is not completely eliminated.
I have given the hostname as hpsolaris.
During startup it says.
“My unqualified hostname(hpsolaris): Sleeping for retry”
Question: If DHCP gives out a different IP address next week, will the new IP address be propogated to the hosts table, or will I have a new problem???
I tried another tips on another sites and
I tried then these instructions and worked great
(on a solaris 10 x86).
Thanks for this! Very simple and easy article to understand.
I have the same question as Carey Schug (above). Does the /etc/hosts file gets updated with a new IP when the DHCP server gives a new IP to the client?
Nice article, thanks.
Excellent post. I was able to assign a Static IP for my solaris VM, but the hostname was coming up unknown set by the DHCP. Your article helped me fix the problem.
Hi, I’m trying to configure a DHCP server, but I can not, presumably the server is already running, because when I run dhcpconfig-Sq is running, but the client does not resolve the IP address, I know how to configure it from scratch, to see which have been my fault, and if I could say that files set up, thanks
great post! worked like charm
I removed the 12 from /etc/default/dhcpagent.
192.168.178.20 unknown # Added by DHCP
192.168.178.20 sonne loghost
After rebooting the /etc/hosts file is changed and instead of “sonne” there is
192.168.178.20 unknow loghost
What is wrong?
It would be creat if you could help.