[CentOS] /etc/resolv.conf changes

Mon Mar 24 20:12:11 UTC 2008
mouss <mouss at netoyen.net>

vincenzo romero wrote:
> Hello all,
>
> I'm getting frustrated attempting to understand; I googled and asked
> folks and am unable to get a straight answer.
>
> 1.  How is the /etc/resolv.conf file maintained ?  I do not seem to
> get a consistent result when I save resolv.conf configuration from GUI
> or by hand using vim /etc/resolv.conf.
>
> a.  Sometimes I the entries toggles between the two entries:
>
> # generated by NetworkManager, do not edit!
> ; Use a local caching nameserver controlled by NetworkManager
> nameserver 127.0.0.1
>
> b.  then when I restart the network services some the /etc/resolv.conf
> file appears like this:
> # generated by NetworkManager, do not edit!
> ; Use a local caching nameserver controlled by NetworkManager
> search lab.mycompany.com
> nameserver 192.168.17.2
>
> This host is:
>
> - a DNS server that is authoritative for its domain within the
> 192.168.16/20 network
> - I believe that even as DNS server, this host should have its
> resolv.conf file configured to define itself as a DNS server, right?
>   

yes. programs that run on the box do not know if there is a dns server 
running.

I have always configured resolv.conf manually.
> I apologize for the naive questions, but I am a newbie and am unable
> to gather a straightforward answer.
>
> thanks in advance.
>
>