Tell me more ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.
up vote 6 down vote favorite
3

I'm using libvirt and kvm to virtualize my server. I configured libvirt to start a dhcp-server on the bridge-network-interface to give the vm's their ips. Every VM's gets always the same ip based on its mac, this is configured like this:

<dhcp>
 <range start='10.1.1.2' end='10.1.1.254' />
 <host mac='54:52:00:21:01:ba' name='virstvm' ip='10.1.1.10' />
 <host mac='00:16:36:2d:71:f9' name='secvm' ip='10.1.1.20' />
</dhcp>

The problem: Whenever I add a new host to the dhcp section I have to restart libvirt-bin which restarts all my vm's. This cant be the solution because it means a downtime every time I add a new Server. Is there a solution?

share|improve this question
Good question I figured it was just a matter of recreating the network after the changes to the network using virsh after you edited the xml file like it is with domains. But this appears to not be the case. As virsh net-dumpxml clearly shows that libvirt still has the original file cached. – 3dinfluence Jan 11 '10 at 3:42

3 Answers

up vote 2 down vote accepted

After a diskussion on the Mailinglist I found out: this currently is not possible at all!

share|improve this answer
up vote 1 down vote

I think libvirt uses dnsmaq for its dhcp server. Maybe you could just restart dnsmasq and all would be well?

share|improve this answer
up vote 1 down vote

The following procedure worked for me with libvirt Version: 0.7.5-5ubuntu27 on a Ubuntu 10.04.4 LTS host:

  virsh net-dumpxml default > default.xml

  $EDITOR default.xml

  virsh net-destroy default
  virsh net-define default.xml
  virsh net-start default

This also works for other networks beside the default network. Just replace the word default in the example with the name of the network.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.