handle kvm static ip adresses
I did a lot of work with libvirt and kvm and for some hosts I wanted to have a fixed IP address but not configured on the host itself. I wanted to get it from dhcp. In the end there are two options to solve this Problem/Feature. But first we need to choose which net-list setup to use.
To get an overview we can do the following:
virsh net-list
Name State Autostart Persistent
----------------------------------------------------------
default active no yes
I use default most of the time. If you don’t want to use it, choose a different name from the list (if you have some).
Edit virsh net-list directly.
virsh net-edit default
If you have executed this command the first time your default editor opens something similar to this:
default
UUID
Now its possible to add the hsots manually. They can be added in the
<dhcp>...</dhcp>
tags below the <range>...</range>
. Here you can add a line
like this:
If you have added your hosts you have to “restart” somehow the network adapter of virsh:
virsh net-destroy default
virsh net-start default
That’s it. If you now restart your virtual machine or just do a dhclient
INTERFACE
you should see the IP.
Use a one in all call.
Second possibility is to use a one in all call. With this call you don’t need to
destroy and start the network adapter. It’s all done by virsh
.
virsh net-update default add-last ip-dhcp-host --xml " " --live --config
This command adds the new host in xml syntax to your default live configuration.
We can double check if the entry really exists:
virsh net-edit default
....
As you see it’s there.
I like the second part more than the first one. It’s more simple and easy and you don’t have to restart the network adapter.