[klibc] ipconfig - single option for specifying hostname

[H. Peter Anvin]

On 07/13/2015 12:03 AM, Phil Lello wrote:
> Hi all,
> 
> I've recently been experimenting with Xen VMs booted using DHCP/NFS, and
> that's looking good.
> 
> One nuisance is that I'm unable to get the DNS to update on the server
> since there's no hostname in the DHCP request packet.
> 
> I'm aware that I can specify a hostname using the long-format device
> name, but this doesn't seem to play well with initramfs. So, I'd like to
> add a patch to ipconfig that allows a parameter to specify the hostname.
> Are there any immediate objections to this, or reasons why this wouldn't
> be accepted?
> 
> Alternatively, it may be that the correct approach would be to leave
> ipconfig alone, and add a minimal nsupdate to klibc so that the hostname
> can be read out of root/etc/hostname later in the pre-boot, then passed
> on to DNS. Thoughts on the relative merrits of the two approaches welcomed.
> 
> Finally, and sorry for asking a 'howto' question, are there any pointers
> on getting klibc to duild on Ubuntu? I'm being frustrated by location of
> kernel headers, and don't want to go adding symlinks from /usr/src.
> 

Typically you would execute a secondary DHCP request to make that
happen.  You *have* to do that anyway, because ipconfig will not renew a
lease.

	-hpa