[libvirt-users] Static DHCP assignments to VMs connected to bridge
Sam Varshavchik
mrsam at courier-mta.com
Mon Jan 29 01:33:32 UTC 2018
Dagmawi Biru writes:
> « HTML content follows »
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> Hello libvirt-users,
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>
> Given the following setup:
> ---
> [Rest of network/dhcp server] ------[ physical interface] ------ [ bridge]
> <----> | <---> [ VM ]
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> I have an interface configured in my Domain XML like so:
> ---
> <interface type="bridge">
> <source bridge="br20">
> </interface>
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> Bridge "br20" is connected to an external network that has a DHCP server.
> However, I want to set it so the interface for this VM has a static IP served
> to it, either by a locally running DHCP server or via some sort of static IP
> assignment in the XML configuration. Is this possible?
I have a DHCP server running on my LAN that defines a static mapping for my
client VMs.
If you already have a DHCP server on my LAN, and you have your client VMs
correctly bridged, and your DHCP server sees them, then it's a simple matter
of configuring your DHCP server.
Looking at my domain XML configuration, what I have is:
<interface type='bridge'>
<mac address='52:54:00:1d:a4:c2'/>
<source bridge='vnet0'/>
<model type='rtl8139'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
Then, I just assign a static IP address mapping for this MAC address, on my
LAN's DHCP server.
If you don't have a DHCP server, you simply have to have your client VM
configured, in the client, with a fixed IP address. The client VM sees a
network port, and it is up to the client VM to set it up. libvirt is out of
the picture here.
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