problem with hostname

[matteo filippetto]

2009/7/9  <pkaplan1 at comcast.net>:
>
> ----- Original Message -----
> From: "NoOp" <glgxg at sbcglobal.net>
> To: ubuntu-users at lists.ubuntu.com
> Sent: Wednesday, July 8, 2009 2:04:45 PM GMT -05:00 US/Canada Eastern
> Subject: Re: problem with hostname
>
>>On 07/06/2009 07:51 PM, pkaplan1 at comcast.net wrote:
>>> When I first set up my box the system prompt read:
>>>
>>> <username>@<hostname>:$
>>>
>>> Recently it changed to :
>>>
>>> <username>@(none):$
>>>
>>> When I need to invoke sudo I get:
>>>
>>> <username>@(none):~$ sudo <command>
>>> sudo: unable to resolve host
>>> sudo: unable to resolve host
>>> sudo: unable to resolve host
>>> sudo: unable to resolve host
>>> [sudo] password for <username>:
>>>
>>> I can set the hostname with:
>>>
>>> sudo hostname <hostname>
>>>
>>> but the new hostname is not retained after reboot.
>>
>>It won't, see 'man hostname'
>><quote>
>>SET NAME
>>       When  called  with one argument or with the --file option, the
>>commands set the host name or the NIS/YP domain name.  Note that this is
>>effective  only  until  the  next  reboot.  Edit /etc/hostname for
>>permanent change.
>>Note, that only the super-user can change the names.
>></quote>
>>
>>>
>>> Shouldn't the following define my hostname?
>>>
>>> <username>@(none):~$ cat /etc/hosts
>>> 127.0.0.1 localhost
>>> 127.0.1.1 <hostname>
>>...
>>> <username>@(none):~$ cat /etc/hostname
>>> <hostname>
>>
>>The last should (/etc/hostname). If you look at 'cat
>>/etc/rcS.d/S02hostname.sh/ or 'cat /etc/init.d/hostname.sh' you will see
>>that it reads /etc/hostname for a value & if it does not find one it
>>will resort to localhost.
>>
>>I tested by duplicating your /etc/hosts and then blanked out
>>/etc/hostname (removed my hostname from the file). Rebooted and now my
>>system shows as yours:
>>
>><username>@(none):~$
>>
>>Changed it back & rebooted & now I'm showing:
>>
>><username>@<hostname>:~$
>>
>>>
>>> How can I restore <hostname> permanently?
>
>>As Fred pointed out:
>>$ gksu gedit /etc/hostname
>>add the host name you wish in the file. Note: only the hostname, nothing
>>else. Reboot and check 'cat /etc/hostname' again before doing anything.
>>
>>If /etc/hostname is blank, then perhaps your network manager is making
>>the change?
>>
>>What version/flavour of Ubuntu are you using? What permissions are set
>>for /etc/hostname?
>>$ ls -l /etc/hostname
>>-rw-r--r-- 1 root root 6 2008-07-12 13:56 /etc/hostname
>>Also check your user privileges (System|Administration|<username>|User
>>Privileges - see if 'Administer the system' is checked.
>>
>
> NoOp,
> Thanks for the explanation and effort.
> Although I'm no expert, /etc/rcS.d/S02hostname.sh/ and 'cat
> /etc/init.d/hostname.sh' appear to point to /etc/hostname and I did not
> knowingly modify these.
> Currently my /etc/hostname file has a single line containing my intended
> hostname.
> The file permissions are as you indicate above.
> I do have administration privileges for the system.
>
> So, still, I'm stumped.  My hostname is not being read following reboot, so
> I have to manually define it after each boot.
>
> Paul
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>

Hi,

maybe your hostname is set by dhcp? do you check this?
In this case you have to set adjust  dhclient.conf

Bye
-- 
Matteo Filippetto