2:48 a.m.
Hi all,
I'm looking at developing a back-end module for DNS that will enable
Cobbler to manage a DNS server that is based upon a MySQL database
(MyDNS/PowerDNS etc) and before I embark on this I was wondering if
either anyone had done anything similar or if there was any more
documentation on how to write these other than the comments in
cobbler/modules/manage_bind.py? :)
Thanks in advance,
Matt
6:15 p.m.
New subject: Cobbler ERROR, 2nd router? - "PXE-E51: No DHCP or proxyDHCP.."
Dear All:
Have you seen this ERROR before?
------
PXE-E51: No DHCP or proxyDHCP offers were received
------
That's what I see at the server where I want to install CentOS onto (via KVM).
I made sure the Cobbler script is working, tested the install on
another server where the install worked.
I found this list of possible causes for such an error:
------
* DHCP services are not available on the network to which the
PXE-enabled NIC is connected.
* A DHCP proxy or IP helper address is not configured for
the subnet on which the PXE client is connected.
* The switch port connected to the PXE NIC is running Spanning
Tree Protocol, EtherChannel Protocol, or Port Aggregation
Protocol and is thus not activated immediately when a link
is detected. This forces the DHCP request from the PXE
client to timeout.
* DHCP is available on the network, but PXE is not.
* The network cable is not attached to the PXE-enabled NIC
on the target server.
http://h18000.www1.hp.com/products/servers/management/rdp/knowledgebase/0...
------
I can ping and access the server that I want to install to ... so all
is fine with cables, and that is on the same networks, same subnet. I
also double-checked the IP and MAC address, all correct.
Now I wonder if maybe there is an issue because of the HP switch that
server is connected to. We have two 24-port HP switches stacked up --
that is, this server is connected to the 2nd switch which is
connected to the first switch. Could that be a cause?
Another possibility: Presently the server where CentOS should be
installed has "Proxmox VE" as an OS running, that's a virtualization
system for VPS. Could it be that this somehow overwrites the Cobbler
"offer"?
Any suggestion is welcome.
Best,
Frank
2:52 a.m.
New subject: Cobbler ERROR, 2nd router? - "PXE-E51: No DHCP or proxyDHCP.."
On Sun, Jul 25, 2010 at 04:15:31PM -0700, Frank wrote:
------
PXE-E51: No DHCP or proxyDHCP offers were received
------
That's what I see at the server where I want to install CentOS onto (via KVM).
I made sure the Cobbler script is working, tested the install on
another server where the install worked.
I can ping and access the server that I want to install to ... so all
is fine with cables, and that is on the same networks, same subnet. I
also double-checked the IP and MAC address, all correct.
I would continue debugging like this:
- boot a uable linux on the to-be-installed server, i.e. grml
live-cd
- start sniffing on that servers network-interface
- start sniffing on the pxe-servers interface, filtering for
to-be-installed servers mac address
- running dhclient on the to-be-installed server
Its the same action as the pxe-code does but should provide you
exactly with what data is leaving the box and what (if at all)
arrives at the server.
If it works here and not with the network-cards PXE implementation
then only differences between these 2 implementations could strike
in i guess..
Now I wonder if maybe there is an issue because of the HP switch that
server is connected to. We have two 24-port HP switches stacked up --
that is, this server is connected to the 2nd switch which is
connected to the first switch. Could that be a cause?
Rule it out in PXE-booting with a crossover-cable or something..
Christian
3:25 a.m.
New subject: Cobbler ERROR, 2nd router? - "PXE-E51: No DHCP or proxyDHCP.."
Thanks Christian. Unfortunately I am right now a few thousand miles
away from the rack, so can't do most of the suggestions ... I should
have mentioned that.
But thanks for the good advise.
Best,
Frank
On Sun, Jul 25, 2010 at 04:15:31PM -0700, Frank wrote:
>
> ------
> PXE-E51: No DHCP or proxyDHCP offers were received
> ------
>
> That's what I see at the server where I want to install CentOS
>onto (via KVM).
> I made sure the Cobbler script is working, tested the install on
> another server where the install worked.
>
> I can ping and access the server that I want to install to ... so all
> is fine with cables, and that is on the same networks, same subnet. I
> also double-checked the IP and MAC address, all correct.
I would continue debugging like this:
- boot a uable linux on the to-be-installed server, i.e. grml
live-cd
- start sniffing on that servers network-interface
- start sniffing on the pxe-servers interface, filtering for
to-be-installed servers mac address
- running dhclient on the to-be-installed server
Its the same action as the pxe-code does but should provide you
exactly with what data is leaving the box and what (if at all)
arrives at the server.
If it works here and not with the network-cards PXE implementation
then only differences between these 2 implementations could strike
in i guess..
> Now I wonder if maybe there is an issue because of the HP switch that
> server is connected to. We have two 24-port HP switches stacked up --
> that is, this server is connected to the 2nd switch which is
> connected to the first switch. Could that be a cause?
Rule it out in PXE-booting with a crossover-cable or something..
Christian
5031
days inactive
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