Red Hat Bugzilla – Bug 81613
installer no longer configures dhcp host name in /etc/dhclient.conf
Last modified: 2007-04-18 12:49:42 EDT
Description of problem: In Red Hat 8.0, there was an installer option to specify a DHCP host name which caused the DHCP client to pass this host name to the DHCP server for dynamic DNS registration. This option is still available in Red Hat 8.0.92, but it no longer works. How reproducible: Only tried once. Steps to Reproduce: 1. Specify a DHCP host name during installation Actual results: Host was not registered for DNS. Expected results: Host was registered for DNS. Additional info: In Red Hat 8.0, specifying this option in the installer created /etc/dhclient.conf with contents similar to: -------------------- interface "eth0" { send host-name "hostname"; } -------------------- This file was not created in the Red Hat 8.0.92 installer. I suspect this is the cause of the problem.
I'm not clear here on what option you're specifying or where you're specifying it. I can't think of any code that's ever been in the installer related to dynamic dns registration.
The option I refer to is in one of the network configuration screens early in the installation process. It is probably labeled something like: Set Host Name: - automatic via DHCP - manual [.....] In Red Hat 8.0 if the manual option was selected and a host name specified, /etc/dhclient.conf was created as specifed earlier in this bug (comment 0). With previous DHCP clients (such as pump and dhcpcd), this functionality could be achieved by adding "-h <hostname>" to the DHCP client's command line or by setting DHCP_HOSTNAME in the /etc/sysconfig file appropriate for that network interface, however this functionality can only (it seems) be achieved by creating /etc/dhclient.conf when using the new DHCP client, dhclient. When this option is specified, when the DHCP client requests a new IP lease it also passes this host name to the DHCP server. This provides the DHCP server with both the new host name and the new (leased) IP address so it can contact the DNS server to perform dynamic DNS registration. Let me know if there's anything else I can help with.
Created attachment 89325 [details] example dhclient.conf This is a file I created to achieve the desired functionality in Red Hat 8.0.92. In Red Hat 8.0, it may have been called something slightly different (perhaps /etc/dhclient.conf-eth0 or /etc/dhclient.conf-auto), and I believe there was a comment in the generated file stating it had been automatically generated by anaconda.
The option in 8.0 just set the systems hostname to the value you supplied. It did not create a dhclient.conf file as you specifed. Phoebe should have that behavior. What you are requesting is a feature enhancement we'll have to consider in a future release.
I'm fairly certain that 8.0 did create this file as I stated, but I don't have the time or a spare box to confirm this. Could you give me a pointer where I could find the relevant code so I can have a quick look at it to prove or disprove my suspicions? Would this be handled by anaconda, or is the network configuration passed off to redhat-config-network or similar?
I discussed this on phoebe-list, and it seems the behavior I have mentioned is possible simply by adding an entry such as DHCP_HOSTNAME=host.example.com to /etc/sysconfig/network or to the ifcfg-interface scripts. Could the installer please be modified to add this line if the manual host name option is selected?
We now write out DHCP_HOSTNAME if you override the dhcp hostname.
Mass-closing lots of old bugs which are in MODIFIED (and thus presumed to be fixed). If any of these are still a problem, please reopen or file a new bug against the release which they're occurring in so they can be properly tracked.