resolv.conf and dhcp clients

Problem

I have an internet-facing linux system which uses DHCP for its internet interface. The DHCP client re-writes my /etc/resolv.conf, which prevents me from using the nameserver installed on it. I don't want to use the DHCP-provided nameservers, I want to use the local one.

Solution

Make your change to /etc/resolv.conf, then mark it as immutable:

# chattr +i /etc/resolv.conf
# lsattr /etc/resolv.conf
----i-------- /etc/resolv.conf

Kind of a hack, but it works.

RedHat users might enjoy Stop DHCP from changing resolv.conf instead.