Changing host name
Ed Greshko
Ed.Greshko at greshko.com
Wed Apr 7 03:11:34 UTC 2010
>
> On 04/06/2010 05:52 PM, Ed Greshko wrote:
>
>>> On Tue, 2010-04-06 at 23:47 +0800, Ed Greshko wrote:
>>>
>>>
>>>> I believe Patrick may have missed the part about your using
>>>> "system-control-network"...if that is of any value.
>>>>
>>> Not really, given that he didn't say he was using s-c-n but something
>>> called the "network control applet" in Gnome. Since I don't use Gnome,
>>> I've no idea what that means, if anything. My reply simply pointed out
>>> that localhost is widely assumed to be defined, and that having it
>>> undefined is likely to lead to breakage. Said breakage may or may not
>>> affect the network connectivity directly, but you can be sure that
>>> something somewhere will not work as expected, i.e. it's a bad idea.
>>>
>>>
>>>
>> I don't use Gnome either. And, AFAIK, there really is no such thing as
>> a "Network Control Applet". I did fire up Gnome and found there is a
>> "Network Control" item in the Gnome menus so I assumed that is what he
>> was using.
>>
>> Bottom line, I was nearly 100% sure he was using a GUI to do the bidding
>> and "hoped" that any GUI wouldn't be so foolish as to muck with the
>> "localhost" settings in the hosts file.
>>
>> He also showed, via ipconfig, that his adapter no longer had an IP
>> address associated with it. That, to me, demonstrates a "dead" network.
>> However, I was unable to reproduce the issue.
>>
> I suspect he's relying on NetworkManager. In that case, if you go in
> and do a "hostname whatever" behind NM's back, it's going to break.
> It will invalidate the DHCP lease (bringing the network down) and
> confuse NM's database (such as it is). NM is rather, uhm, touchy
> (cranky) about things being done without its knowledge.
>
Why do you suggest that? My test system relies on DHCP, it also is
configured to utilize NM. I changed the hostname using the "hostname"
command. No ill effects. Besides, DHCP makes use of the MAC address
and not the hostname.
> The best bet is to edit /etc/sysconfig/network, set the desired hostname
> in there, reboot the system and log back in. NM should pick up a
> DHCP lease and such with the desired hostname taken care of.
>
I've never found a need to reboot on changing hostnames. The most
drastic action I've taken was to "service network restart".
> Note that I don't necessarily like NM. It is useful, but it is
> rather incompletely documented and much of what various people know
> about it is rather anecdotal and may or may not be accurate, depending
> on which version of NM they're running. God help us!
>
> NM people: I'm still willing to write the docs for this beast. All it
> takes is you to tell me to and give me some contact info so I can
> clarify things when needed. I'll overlook the deafening silence I was
> greeted with in my past offers.
>
Can't say that I've experienced any of the NM woes others have gone
through. But, maybe that is becuase I don't have wireless. Looking
forward to testing that sometime soon with F13 as it seems it now will
support my wireless adapter.
--
The world is no nursery. - Sigmund Freud Guess Who!
http://tinyurl.com/mc4xe7
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