Public bug reported:
This is more a feature request than an actual bug.
When Orchestra installs and Cobbler is first configured with a server,
it defaults to listening on the first available network interface
(usually eth0) for DHCP requests.
This causes problems when Orchestra is used to bring up a cluster of
virtual machines running on one physical server -- the virtual machines
send DHCP requests over a host-only interface, but dnsmasq (the DNS/DHCP
server Orchestra uses) never sees them. This leaves the VMs stuck
waiting for DHCP data which will never arrive...
The solution is twofold:
- Initially, use Virt-Manager or similar to create a virtual network for all
the virtual machines which are to be managed by Orchestra. Call it, for example
"PxeReload". Virt-Manager will tell you what the physical network device name
is -- in my case, it was virbr1. Set this as active, autostarting on boot, with
DHCP disabled and the IP range you desire (I used 192.168.100.0/24). Forwarding
should be set to "Isolated Network" (otherwise it will stomp all over your
LAN's DHCP server)
- Install orchestra-server. Provide details about your network. In my case, I
used:
Password for cobbler user -- (like I'd tell you that!)
Boot and PXE server IP -- was autodetected OK, but in my case, 192.168.100.1
Enable Orchestra Managed DHCP/DNS? Yes
DHCP Range: 192.168.100.5,192.168.100.200
Default Gateway for DHCP clients: leave blank (it's the Provisioning server)
Domain name: virtual.lan (I just used virtual)
Once you've done this, you can follow the instructions in
http://cloud.ubuntu.com/2011/09/oneiric-server-deploy-server-fleets-p2/
and/or http://cloud.ubuntu.com/2011/10/getting-started-with-ubuntu-
orchestra-servers-in-concert/ to add the virtual machine (created with
virt-manager, VirtualBox, VMware or whatever) to Cobbler.
Now you need to edit Cobbler's DNSMasq config template --
- sudo vim /etc/cobbler/dnsmasq.template
After "domain=virtual", insert these lines:
# Restrict DNSMasq DHCP and DNS to host-only virtual Ethernet bridge used for
PXE reloads
interface = virbr1
Save and exit.
Run "sudo cobbler sync" and everything should work. If DNSMasq fails to
restart, "sudo killall dnsmasq" then "sudo service dnsmasq restart"
(sometimes the rcscript thinks DNSMasq is stopped when in fact it is
still running).
After all this, you should have a server, hosting virtual machines which
you can create, configure, set up, tear down and reinstall to your
heart's content.
** Affects: orchestra (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/911873
Title:
No way to manually restrict DHCP to one interface
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