pxe boot: problems with /etc/resolv.conf

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http://unix.stackexchange.com – I'm pxe booting a node (Ubuntu 11.10). The image of the node is created with debootstrap. Works great. Everything is loaded. When I login to the node I see that /etc/resolv.conf is empty. In the base image it's empty also but I expected the ubuntu boot process to fill it with a nameserver. When, on the node, I do sudo service networkinging {start,restart} nothing changes to etc/resolv.conf. When I do a dhclient I get: RNETLINK answers: File exists but /etc/resolv.conf then contains the correct nameserver from my dhcp-server. The linuxrc I use can be found on github. (Part) of the bootscree (HowTos)