[CentOS] Disappearing Network Manager config scripts

[Keith Keller]

On 2014-04-30, Les Mikesell <lesmikesell at gmail.com> wrote:
> On Wed, Apr 30, 2014 at 10:01 AM, Keith Keller
><kkeller at wombat.san-francisco.ca.us> wrote:
>>
>> No settings might be better.  If I take my laptop from one site to
>> another, keeping my previous resolv.conf intact, and NM doesn't remove
>> it, then my laptop will try to query the previous site's DNS.  They may
>> not like that; depending on how paranoid they are, they may even take
>> measures to block my traffic.  Even if not, I may see some really
>> bizarre DNS behavior which could be difficult to troubleshoot, whereas
>> having no DNS at all will be very obvious very quickly.
>
> So you only have one network interface active at a time?

That is of course not what I wrote.  The above is just one example where
I might prefer an empty resolv.conf instead of an old (and possibly
incorrect) one.

> Our
> servers typically have at least 6 NICs and it is pretty common to have
> at least 4 active on different subnets.  And bringing up a new
> interface does _not_ mean I always want to use the DNS servers or
> default route DHCP might offer.

So in this case you might prefer an old resolv.conf instead of a new
one or an empty one  I don't recall anyone ever writing that any of
these scenarios is always preferable over the other.

At any rate, for CentOS 6 we can still say "if you don't like NM, don't
use it".

--keith


-- 
kkeller at wombat.san-francisco.ca.us