NetworkManager vs Cacheing nameserver

[Tom H]

>> How does one convince NM not to interfere with resolv.conf?

> Don't know for sure how to make interfaces managed by NM
> stop doing it, but for my non-NM system I still have to
> prevent resolv.conf from being scrogged by setting
> PEERDNS=no
> in my /etc/sysconfig/network-scripts/ifcfg-eth0 file.

resolv.conf is overwritten by dhclient, whether the interface is is
NM-managed or not, so your "PEERDNS=no" solution will work for the OP.