CentOS - Nov 2009 - NetworkManager constantly overwriting /etc/resolve.conf - how to disable?

Hi all,

I have a CentOS 5.4 server-only installation, i.e. no X installed, and
for some odd reason /etc/resolve.conf gets overwritten by
NetworkManager on a constant basis. I haven't been able to track down
how often, but I think it's on the hour, or something.

This is the conents of the file right now:

# Generated by NetworkManager


# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com




So, I change it to the following:

nameserver 192.168.1.254, save it, and all network functions work
fine. But, later on it get's changed again. Running
"system-config-network", I can see that the nameserver that I have
specified is in there, yet it doesn't show up in /etc/resolve.conf.

I have searched a bit on google, but all the results reveal how to use
NetworkManager to setup the nameservers, but now how it get's set
automatically. Why does this happen, and how do I stop it from
happening?

-- 
Kind Regards
Rudi Ahlers
CEO, SoftDux Hosting
Web: http://www.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532

At Sun, 29 Nov 2009 22:57:23 +0200 CentOS mailing list <centos at
centos.org> wrote:
> 
> Hi all,
> 
> I have a CentOS 5.4 server-only installation, i.e. no X installed, and
> for some odd reason /etc/resolve.conf gets overwritten by
> NetworkManager on a constant basis. I haven't been able to track down
> how often, but I think it's on the hour, or something.
> 
> This is the conents of the file right now:
> 
> # Generated by NetworkManager
> 
> 
> # No nameservers found; try putting DNS servers into your
> # ifcfg files in /etc/sysconfig/network-scripts like so:
> #
> # DNS1=xxx.xxx.xxx.xxx
> # DNS2=xxx.xxx.xxx.xxx
> # DOMAIN=lab.foo.com bar.foo.com
> 
> 
> 
> 
> So, I change it to the following:
> 
> nameserver 192.168.1.254, save it, and all network functions work
> fine. But, later on it get's changed again. Running
> "system-config-network", I can see that the nameserver that I
have
> specified is in there, yet it doesn't show up in /etc/resolve.conf.
> 
> I have searched a bit on google, but all the results reveal how to use
> NetworkManager to setup the nameservers, but now how it get's set
> automatically. Why does this happen, and how do I stop it from
> happening?
You probably DON'T want NetworkManager running on a server!

Do this:

# Stop NetworkManager
sudo /sbin/service NetworkManager stop
# Disable it from starting at boot time
sudo /sbin/chkconfig NetworkManager off

And then *manually* set things up.

NetworkManager is meant for things like laptops that are (randomly)
connected to this or that WiFi at this or that Internet Cafe, Library,
School, Home WiFi, whatever.  NetworkManager automagically adjusts
things as it encounters different networks, etc.  A server will have
fixed / static networking and needs no dynamic adjustments.
> 
-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
heller at deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/

Rudi Ahlers wrote:
> Hi all,
>
> I have a CentOS 5.4 server-only installation, i.e. no X installed, and
> for some odd reason /etc/resolve.conf gets overwritten by
> NetworkManager on a constant basis. I haven't been able to track down
> how often, but I think it's on the hour, or something.
>
> This is the conents of the file right now:
>
> # Generated by NetworkManager
>
>
> # No nameservers found; try putting DNS servers into your
> # ifcfg files in /etc/sysconfig/network-scripts like so:
> #
> # DNS1=xxx.xxx.xxx.xxx
> # DNS2=xxx.xxx.xxx.xxx
> # DOMAIN=lab.foo.com bar.foo.com
>
>
>
>
> So, I change it to the following:
>
> nameserver 192.168.1.254, save it, and all network functions work
> fine. But, later on it get's changed again. Running
> "system-config-network", I can see that the nameserver that I
have
> specified is in there, yet it doesn't show up in /etc/resolve.conf.
>
> I have searched a bit on google, but all the results reveal how to use
> NetworkManager to setup the nameservers, but now how it get's set
> automatically. Why does this happen, and how do I stop it from
> happening?
>
>   
Rudi,
As I recall there was a thread about this a few weeks ago.
Please show your /etc/sysconfig/network-scripts/ifcfg-ethX contents.
Thanks

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On 29/11/09 22:43, Rob Kampen wrote:
> Rudi Ahlers wrote:
>> Hi all,
>>
>> I have a CentOS 5.4 server-only installation, i.e. no X installed, and
>> for some odd reason /etc/resolve.conf gets overwritten by
>> NetworkManager on a constant basis. I haven't been able to track
down
>> how often, but I think it's on the hour, or something.
> As I recall there was a thread about this a few weeks ago.
> Please show your /etc/sysconfig/network-scripts/ifcfg-ethX contents.
Add to /etc/sysconfig/network-scripts/ifcfg-ethX
The following 2 lines :
PEERDNS=no
NM_CONTROLLED=no

Line 1 tells the the if commands not to override /etc/resolv.conf
Line 2 tells NetworkManager that it doens't have control over that 
ethernet controller


-- 
Toshaan <toshlinux at gmail.com> - http://www.toshaan.be

On Sun, Nov 29, 2009 at 11:43 PM, Rob Kampen <rkampen at
kampensonline.com> wrote:
>
> Rudi,
> As I recall there was a thread about this a few weeks ago.
> Please show your /etc/sysconfig/network-scripts/ifcfg-ethX contents.
> Thanks
>
>
> _______________________________________________

Hi Rob,

Here's the contents:


[root at intranet OpenQRM]# more /etc/sysconfig/network-scripts/ifcfg-eth0
# Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:16:e6:69:49:9a
ONBOOT=yes
NETMASK=255.255.255.0
IPADDR=192.168.1.250
GATEWAY=192.168.1.254
TYPE=Ethernet
DNS=192.168.1.254
DNS=192.168.1.1



-- 
Kind Regards
Rudi Ahlers
CEO, SoftDux Hosting
Web: http://www.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532