[CentOS] From Networkmanager to self managed configuration files

Wed Mar 8 12:25:39 UTC 2017
David Both <dboth at millennium-technology.com>

On 03/08/2017 05:43 AM, Giles Coochey wrote:
> On 08/03/17 10:38, John Hodrien wrote:
>> On Wed, 8 Mar 2017, Giles Coochey wrote:
>>> ifconfig enp0s25 netmask
>>> route add default gw enp0s25
>>> echo nameserver > /etc/resolv.conf
>>> echo nameserver >> /etc/resolv.conf
>> Oh okay, you really do want to back away from Redhat entirely. That's
>> entirely your choice.
>> What you end up with if you take this approach widely is effectively
>> your own
>> linux distribution.
> Not really, Redhat/Centos has a lot to offer, but for me, networking 
> is a one-time configuration, and the best way to configure it is using 
> something that falls within this principle:
> https://en.wikipedia.org/wiki/KISS_principle
> I'm not flaming NetworkManager, I'm just stating that for many 
> (perhaps most), it is over-engineered for a server orientated 
> distribution. I can run with the script above on 30 server instances, 
> and it doesn't, as yet, break any of the other features of Centos that 
> I enjoy.
I do not agree with your conclusions about NetworkManager.  First, I use 
it on several servers and firewalls that - theoretically at least - 
should never change. Some of the most tiresome problems I have had to 
fix were what happened due to renaming of NICs after replacing a bad 
one, or a 100Mb with a Gb NIC, or adding a new NIC to connect with a new 
network. NetworkManager keeps NIC naming consistent with no surprises. I 
am getting ready to install two new NICs in a firewall/router that 
already has two NICs and I am not dreading that change as I would have 
with the old network service.

I have had excellent results with NetworkManager and am very happy with 
it. I see it as a significant improvement over the old network service. 
If you are concerned about performance issues - don't worry - you won't 
have any. It works fine on my RaspberryPI forewall/router using CentOS 7 
for ARM and on my ancient EeePC that runs a full installation of Fedora 25.

Don't try to fix something that isn't broken.


David P. Both, RHCE
Millennium Technology Consulting LLC
Raleigh, NC, USA

dboth at millennium-technology.com

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