Re: [CentOS] Set hostname via DHCP ?
If your trying to make CentOS/Fedora boxes to get hostname remember you need
to have localhost.localdomain in /etc/sysconfig/network.
HOSTNAME=localhost.localdomain
see around line 252-261
/etc/sysconfig/network-scripts/network-functions
need_hostname ()
{
CHECK_HOSTNAME=`hostname`
if [ $CHECK_HOSTNAME = (none) -o $CHECK_HOSTNAME = localhost -o
\
$CHECK_HOSTNAME = localhost.localdomain ]; then
return 0
else
return 1
fi
}
__
Andreas Pedersen
On Sun, Jun 28, 2009 at 11:35 PM, Rob Townley rob.town...@gmail.com wrote:
# i do NOT have any kind of use-host-decl-names on; entry. Do you use
dnsmasq or dhcpd?
# /etc/dhcpd.conf Not sure if a dnsmasq entry would be the same anymore.
host babasse {
hardware ethernet 00:0d:61:ae:6b:8f;
fixed-address 192.168.1.249;
option host-name
PutClientHostNameHereNotSureIfItHasToBeSameAsAbove-babasse;
}
#Don't remember what happens when a linux client machine has already
been configured.
#But know for a fact that all pxe booted and live linux booted and
Windows Vista and WinXP
#machines use the hostname from the dhcpd entry.
On Sun, Jun 28, 2009 at 10:38 AM, Niki Kovacscont...@kikinovak.net
wrote:
Hi.
I just setup one of my machines as a DHCP server. I'd like it to handle
the hostnames of clients. Don't know if this is an orthodox thing to do
(feel free to add your comments :oD). Here's the server's relevant lines
of dhcpd.conf:
--8---
...
# Envoyer les noms d'hôtes aux clients
use-host-decl-names on;
# Adresses statiques
host babasse {
hardware ethernet 00:0d:61:ae:6b:8f;
fixed-address 192.168.1.249;
}
--8---
Now the question is: how should the configuration look like on the
client side, so the hostname gets effetively fetched from the DHCP
server? During the initial install, I assigned hostnames manually to
every machine.
Cheers,
Niki Kovacs
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Re: [CentOS] Set hostname via DHCP ?
Rob Townley a écrit :
# i do NOT have any kind of use-host-decl-names on; entry. Do you use
dnsmasq or dhcpd?
I'm using DHCPD. I took two spare machines this morning and played
around with them to make some tests. Here's what I got.
a) Server-side, static IP configuration of course, here's what
dhcpd.conf looks like:
# Options globales
ddns-update-style interim;
authoritative;
default-lease-time 86400; # un jour
max-lease-time 86400; # un jour
# Données du réseau local
option broadcast-address192.168.1.255;
option subnet-mask 255.255.255.0;
option routers 192.168.1.254;
option domain-name-servers 62.4.16.70, 62.4.17.69;
option domain-name local;
# Plage d'adresses dynamiques
subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.1 192.168.1.240;
}
host raymonde {
hardware ethernet 00:20:ed:b8:e8:ec;
fixed-address 192.168.1.2;
option host-name raymonde;
}
b) on the client side, just a plain (default) DHCP client configuration.
Now the client (raymonde) gets his pre-defined address OK. And even
the hostname gets transmitted. Now the question is: how do I also assign
the domain name (local) to the client?
If I take a look at /var/lib/dhclient/dhclient-eth0.leases (on the
client), here's a summary of the lease:
lease {
interface eth0;
fixed-address 192.168.1.2;
option subnet-mask 255.255.255.0;
option routers 192.168.1.254;
option dhcp-lease-time 86400;
option dhcp-message-type 5;
option domain-name-servers 62.4.16.70,62.4.17.69;
option dhcp-server-identifier 192.168.1.252;
option broadcast-address 192.168.1.255;
option host-name raymonde;
option domain-name local;
renew 1 2009/6/29 17:04:30;
rebind 2 2009/6/30 04:47:44;
expire 2 2009/6/30 07:47:44;
}
Here's what 'hostname' returns:
# hostname
raymonde
But when I go for the domain name, I get this:
# hostname -d
hostname: Hôte inconnu -- means 'Unknown host' in french :o)
Any idea what I'm doing wrong here?
Cheers,
Niki
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Re: [CentOS] Set hostname via DHCP ?
Niki Kovacs a écrit :
If I take a look at /var/lib/dhclient/dhclient-eth0.leases (on the
client), here's a summary of the lease:
lease {
interface eth0;
fixed-address 192.168.1.2;
option subnet-mask 255.255.255.0;
option routers 192.168.1.254;
option dhcp-lease-time 86400;
option dhcp-message-type 5;
option domain-name-servers 62.4.16.70,62.4.17.69;
option dhcp-server-identifier 192.168.1.252;
option broadcast-address 192.168.1.255;
option host-name raymonde;
option domain-name local;
renew 1 2009/6/29 17:04:30;
rebind 2 2009/6/30 04:47:44;
expire 2 2009/6/30 07:47:44;
}
Here's what 'hostname' returns:
# hostname
raymonde
But when I go for the domain name, I get this:
# hostname -d
hostname: Hôte inconnu -- means 'Unknown host' in french :o)
Any idea what I'm doing wrong here?
OK, I think I got my mistake. When I specify a domain name (with 'option
domain-name'), this is in fact what gets written to the client's
/etc/resolv.conf in the 'search' line. But to handle the fully qualified
domain name centrally, I have to use DNS.
Correct me if I'm wrong.
Niki
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Re: [CentOS] Set hostname via DHCP ?
Niki Kovacs wrote:
Niki Kovacs a écrit :
If I take a look at /var/lib/dhclient/dhclient-eth0.leases (on the
client), here's a summary of the lease:
lease {
interface eth0;
fixed-address 192.168.1.2;
option subnet-mask 255.255.255.0;
option routers 192.168.1.254;
option dhcp-lease-time 86400;
option dhcp-message-type 5;
option domain-name-servers 62.4.16.70,62.4.17.69;
option dhcp-server-identifier 192.168.1.252;
option broadcast-address 192.168.1.255;
option host-name raymonde;
option domain-name local;
renew 1 2009/6/29 17:04:30;
rebind 2 2009/6/30 04:47:44;
expire 2 2009/6/30 07:47:44;
}
Here's what 'hostname' returns:
# hostname
raymonde
But when I go for the domain name, I get this:
# hostname -d
hostname: Hôte inconnu -- means 'Unknown host' in french :o)
Any idea what I'm doing wrong here?
OK, I think I got my mistake. When I specify a domain name (with 'option
domain-name'), this is in fact what gets written to the client's
/etc/resolv.conf in the 'search' line. But to handle the fully qualified
domain name centrally, I have to use DNS.
Correct me if I'm wrong.
In our environment, our dhcp client machines (rhel or centos) gets their
hostname by dns lookups (Not sure why).
Our dhcp server generally just provides the usual configurations like
dns/search optionse/etc. The ip addresses for our dhcp range have both
forward and reverse mappings on our dns server and the clients obtain
the proper fully qualified host name upon dhcp request.
HTH,
Liming
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Re: [CentOS] Set hostname via DHCP ?
Hi,
On Mon, Jun 29, 2009 at 04:00, Niki Kovacscont...@kikinovak.net wrote:
host raymonde {
hardware ethernet 00:20:ed:b8:e8:ec;
fixed-address 192.168.1.2;
option host-name raymonde;
}
[...]
lease {
option host-name raymonde;
option domain-name local;
}
Here's what 'hostname' returns:
# hostname
raymonde
But when I go for the domain name, I get this:
# hostname -d
hostname: Hôte inconnu -- means 'Unknown host' in french :o)
Any idea what I'm doing wrong here?
I guess you have to use this in dhcpd.conf:
option host-name raymonde.local;
At least, in my dhclient-eth0.leases file I have option host-name with
the fully qualified host name...
I am getting host names from DNS with get-lease-hostnames on; in
dhcpd.conf, so I think it does what I expect (sending FQDNs) in that
case...
HTH,
Filipe
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[CentOS] Set hostname via DHCP ?
Hi.
I just setup one of my machines as a DHCP server. I'd like it to handle
the hostnames of clients. Don't know if this is an orthodox thing to do
(feel free to add your comments :oD). Here's the server's relevant lines
of dhcpd.conf:
--8---
...
# Envoyer les noms d'hôtes aux clients
use-host-decl-names on;
# Adresses statiques
host babasse {
hardware ethernet 00:0d:61:ae:6b:8f;
fixed-address 192.168.1.249;
}
--8---
Now the question is: how should the configuration look like on the
client side, so the hostname gets effetively fetched from the DHCP
server? During the initial install, I assigned hostnames manually to
every machine.
Cheers,
Niki Kovacs
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Re: [CentOS] Set hostname via DHCP ?
On Sun, 2009-06-28 at 17:38 +0200, Niki Kovacs wrote:
Hi.
I just setup one of my machines as a DHCP server. I'd like it to handle
the hostnames of clients. Don't know if this is an orthodox thing to do
I really don't know if it's orthodox or not, but I've been doing it
like this for years. ;^
(feel free to add your comments :oD). Here's the server's relevant lines
of dhcpd.conf:
--8---
...
# Envoyer les noms d'hôtes aux clients
use-host-decl-names on;
# Adresses statiques
host babasse {
hardware ethernet 00:0d:61:ae:6b:8f;
fixed-address 192.168.1.249;
}
--8---
This config is just about identical to mine.
Now the question is: how should the configuration look like on the
client side, so the hostname gets effetively fetched from the DHCP
server? During the initial install, I assigned hostnames manually to
every machine.
Unless you have modified the DHCP client config, the machine SHOULD get
the hostname by default. You can verify this by checking the contents
of /var/lib/dhclient/dhclient-eth0.leases to see the data that the
client has gotten from the server.
Since I let my client machines get all this from DHCP during
installation, I'm not completely sure what you need to do to make the
manually-assigned hostname go away. I THINK that if you comment out the
line for the host's IP address in /etc/hosts the system will use the
hostname from DHCP, but I haven't exercised that stuff in years.
Cheers,
Niki Kovacs
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--
Ron Loftin relof...@twcny.rr.com
God, root, what is difference ? Piter from UserFriendly
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Re: [CentOS] Set hostname via DHCP ?
# i do NOT have any kind of use-host-decl-names on; entry. Do you use
dnsmasq or dhcpd?
# /etc/dhcpd.conf Not sure if a dnsmasq entry would be the same anymore.
host babasse {
hardware ethernet 00:0d:61:ae:6b:8f;
fixed-address 192.168.1.249;
option host-name
PutClientHostNameHereNotSureIfItHasToBeSameAsAbove-babasse;
}
#Don't remember what happens when a linux client machine has already
been configured.
#But know for a fact that all pxe booted and live linux booted and
Windows Vista and WinXP
#machines use the hostname from the dhcpd entry.
On Sun, Jun 28, 2009 at 10:38 AM, Niki Kovacscont...@kikinovak.net wrote:
Hi.
I just setup one of my machines as a DHCP server. I'd like it to handle
the hostnames of clients. Don't know if this is an orthodox thing to do
(feel free to add your comments :oD). Here's the server's relevant lines
of dhcpd.conf:
--8---
...
# Envoyer les noms d'hôtes aux clients
use-host-decl-names on;
# Adresses statiques
host babasse {
hardware ethernet 00:0d:61:ae:6b:8f;
fixed-address 192.168.1.249;
}
--8---
Now the question is: how should the configuration look like on the
client side, so the hostname gets effetively fetched from the DHCP
server? During the initial install, I assigned hostnames manually to
every machine.
Cheers,
Niki Kovacs
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