RHEL5/CentOS5 KS Network Oddities (ifcfg-* gets re-written)

[John Wang]

Hello Christian

How about putting the following into your %post:

    echo "RUN_FIRSTBOOT=NO" > /etc/sysconfig/firstboot

That should fool firstboot into thinking that it already ran...

Regards,
John


On 9/25/07 6:02 PM, "kslist" <kslist at devo.com> wrote:

> Hello KSers,
> 
> I am using my Kickstart script that I have adapted from RHEL 2.1, 3, and 4
> now on CentOS 5. CentOS 5 behaves differently when it comes to network
> configuration.
> 
> In essence: AFTER the successfull installation, during the first startup
> of the OS, something desctroys my network configuration. Specifically, the
> files that I have directly written in my %post script:
> /etc/sysconfig/network
> /etc/sysconfig/network-scripts/ifcfg-eth0
> /etc/sysconfig/network-scripts/ifcfg-eth1
> /etc/hosts
> /etc/resolve.conf
> are modified, and in the case of the ifcfg-* scripts, my scripts are moved
> to a *.bak file (which have a datestamp later than the files I created via
> %post, and which correspond to the firstboot) and a completely newfile is
> created in its place.
> 
> The network configuration that replaces my own is one for DHCP.
> 
> My guess is that this is a result of a change in behaviour of the
> "network" option. To quote from the RHEL 5 Installation Guide:
> 
> "Configures network information for the system. If the kickstart
> installation does not require networking (in other words, it is not
> installed over NFS, HTTP, or FTP), networking is not configured for the
> system. If the installation does require networking and network
> information is not provided in the kickstart file, the installation
> program assumes that the installation should be done over eth0 via a
> dynamic IP address (BOOTP/DHCP), and configures the final, installed
> system to determine its IP address dynamically. The network option
> configures networking information for kickstart installations via a
> network as well as for the installed system."
> 
> Now, I see a problem here:
> - I use DHCP to install the system (via Kickstart)
> - I however do NOT want to run the subsequently installed OS to use DHCP.
> 
> I would say that is a very very normal thing to want.
> 
> However, the way the manual describes it, and from the behaviour I have
> seen, it is not possible to install via DHCP, and then setup your own
> network configuration in %post, because your configuration will be
> overwritten next time you boot the system.
> 
> Ussing "firstboot --disable" doesn't help.
> 
> Please help!
> 
> -Christian
> 
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