Comment # 23 on bug 1003872 from Thomas Blume

(In reply to Marius Tomaschewski from comment #22)
> (In reply to Fabian Vogt from comment #19)
> > I wonder whether it might be possible to simply use the kernel's address for
> > the active mount, at least as a fallback. It can be obtained via findmnt -t
> > nfs,nfs4 -nro OPTIONS / | sed 's/.*,addr=\([^=]*\)/\1/'.
> 
> The hint to use findmnt works also in more exotic scenarios like nfsserver
> in /etc/hosts only (with static setup) or NIS instead DNS in nsswitch.conf.
> 
> It's worth a beer!

Thanks Fabian, Marius, it seems that it is indeed better to not rely on dns
resolution for the nfs root mount.
Not sure whether cases exists where the kernel is not providing the nfs server
address, but then, we could still use dns as fallback.
I will look into providing a patch.

Still, I want to point out that this won't solve the installer issue, e.g. even
if the nfsroot system boots afterwards, resolv.conf would still be empty.