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Braempje
l33t
Joined: 31 Jan 2003
Posts: 748
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 Posted: Sun Jan 09, 2005 9:33 am Post subject: Setting hostname and domainname when using DHCP |
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Most manuals regarding hostnames require a fixed IP. When going dynamic this doesn't work anymore...
Files you should change:
- /etc/hostname
- /etc/hosts
- /etc/dnsdomainname
- /etc/nisdomainname
In this howto we shall use gentoo as our hostname and localnetwork as our domainname
1) make sure /etc/hostname contains only your hostname:
| Code: | | echo gentoo > /etc/hostname |
2) /etc/hosts should contain:
| Code: | | 127.0.0.1 gentoo.localnetwork gentoo localhost |
Do mind the order, it's important!
3) /etc/dnsdomainname should contain localnetwork
| Code: | | echo localnetwork > /etc/dnsdomainname |
4) make /etc/nisdomainname a symlink to dnsdomainname:
| Code: | cd /etc
ln -s dnsdomainname nisdomainname |
5) make sure domainname is start at boot
| Code: | | rc-update add domainname default |
(If it's already there it will give a warning)
6) start domainname
| Code: | | /etc/init.d/domainname start |
7) check your configuration:
| Code: | # hostname
gentoo
# domainname
localnetwork
# hostname --fqdn
gentoo.localnetwork |
Some people reported a reboot is necessary to make settings permanent. That's not the linux way of doing things, but it might be necessary.
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Leffe
Tux's lil' helper
Joined: 07 Apr 2004
Posts: 145
Location: Sweden
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| Posted: Sun Jan 09, 2005 6:53 pm Post subject: |
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| Newer (~) baselayouts (and etc) have the dnsdomainname and nisdomainname in /etc/conf.d/domainname and the hostname in /etc/conf.d/hostname. Upgrading will just give warnings if you are not setting it there though and still use the old values. |
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comprookie2000
Retired Dev
Joined: 25 Jul 2004
Posts: 925
Location: Sun City Center, Florida
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Azerix
Guru
Joined: 19 Dec 2004
Posts: 346
Location: NL
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| Posted: Sun Jan 09, 2005 10:45 pm Post subject: |
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| i am trying to use gentoo as router, but dhcpd is not starting, do you i think i have do that too, do you think i have to setup dnsdomein, hostanme en localnetwork? |
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Braempje
l33t
Joined: 31 Jan 2003
Posts: 748
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| Posted: Mon Jan 10, 2005 6:56 am Post subject: |
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| comprookie2000 wrote: | | Thanks Braempje,If I'm using a static will this way be O.K? |
Static IP users can use the following format for /etc/hosts:
| Code: | 127.0.0.1 localhost
1.2.3.4 gentoo.localnetwork gentoo |
where 1.2.3.4 should be replaced by your static IP.
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Braempje
l33t
Joined: 31 Jan 2003
Posts: 748
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| Posted: Mon Jan 10, 2005 6:57 am Post subject: |
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| Azerix wrote: | | i am trying to use gentoo as router, but dhcpd is not starting, do you i think i have do that too, do you think i have to setup dnsdomein, hostanme en localnetwork? |
hostname etc don't matter for dhcp, at least not for starting it
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mattheweast
Tux's lil' helper
Joined: 17 Sep 2004
Posts: 121
Location: London, UK
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| Posted: Tue Jan 11, 2005 1:58 pm Post subject: |
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EDITED:
Hi there, thanks for the guide, although I have had some slight problems. Although I originally posted my reply here, I've now moved it to a support forum, realising the error of my ways 
It is at https://forums.gentoo.org/viewtopic.php?p=1966528
Thanks again!
Matt |
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Tolstoi
l33t
Joined: 20 May 2004
Posts: 678
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| Posted: Sat Jan 15, 2005 9:59 am Post subject: |
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| Thanks, that worked. Searched a long time for such a guide. |
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comprookie2000
Retired Dev
Joined: 25 Jul 2004
Posts: 925
Location: Sun City Center, Florida
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| Posted: Tue Feb 01, 2005 8:17 pm Post subject: |
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| Braempje wrote: | | comprookie2000 wrote: | | Thanks Braempje,If I'm using a static will this way be O.K? |
Static IP users can use the following format for /etc/hosts:
| Code: | 127.0.0.1 localhost
1.2.3.4 gentoo.localnetwork gentoo |
where 1.2.3.4 should be replaced by your static IP. |
I still had to add | Code: | | 127.001 gentoo.localnetwork gentoo localhost |
for hostname --fqdn to give me the correct reply;
Mine is like this now | Code: | 127.0.0.0 gentoo.localnetwork gentoo
1.2.3.4 gentoo.localnetwork |
Is this O.K.
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Braempje
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wildcart
n00b
Joined: 19 Oct 2004
Posts: 11
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| Posted: Sat Oct 29, 2005 12:44 am Post subject: |
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This works fine... but I still have a problem that someone might be able to solve.
Your method assumes that the dns domainname is set using /etc/init.d/domainname but it does not consider that the dns domainname might be changed by the dhcp client. Does anyone have any ideas how to solve this problem? I cannot set the dns domainname statically on my laptop because I travle between to locations requiring me to have the domainname of the location I am at.
Right now I create the
| Code: | | 127.0.0.1 gentoo.localnetwork gentoo localhost |
line in the /etc/conf.d/net postup function using sed but there might be a better way.
While I am asking: I have the same problem with nis / yp. What I do right now is calling /bin/domainname `grep domain /etc/yp.conf|awk '{print $2}'` in the postup function like its suggested in /etc/init.d/domainname. Again there should be something better solution. Also why do I have to run domainname <DOM> anyways? The /etc/yp.conf file is setup by the dhcp client and /etc/init.d/ypbind is started after the network interface is set up. Since ypbind is supposed to use /etc/yp.conf as its config file I wonder why it reads the yp server but not the yp domainname from that file.
Don't I see the obvious??? |
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