[libivrt] Static IP address not being used by guest machine

zf · 2024-11-21 21:40:59

I am running the official Arch Basic VM preinstalled image on a guest machine using the libvirt/qemu/vkm stack intended for testing Ansible playbooks. I'm struggling to gest the guest to receive a static IP address--here's the steps I've taken:

$ virsh shutdown <guest>
$ virsh net-edit default # Edit the 'default' network to: https://0x0.st/Xnd_.txt
$ systemctl restart libvirtd
$ virsh start <guest>
$ virsh net-dhcp-leases default # Output below:

Expiry Time MAC address Protocol IP address Hostname Client ID or DUID
-----------------------------------------------------------------------------------------------------------------------------------------------
2024-11-21 12:14:42 52:54:00:99:3b:2d ipv4 192.168.122.3/24 archlinux ff:56:50:4d:98:00:02:00:00:ab:11:fc:ef:36:3f:44:8e:ef:d5

IP address is not set to 19.2168.122.101 as given. Any ideas? I've also tried the following:

$ virsh domif-setlink arch-vm 52:54:00:99:3b:1d down
$ sleep 10
$ virsh domif-setlink arch-vm 52:54:00:99:3b:1d up

$ sudo mv '/var/lib/libvirt/dnsmasq/virbr0'* /tmp # This is supposed to renew the lease
$ sudo net-destroy default
$ sudo net-start default

And in the guest, also tried:

$ sudo ip link set eth0 down
$ sudo ip link set eth0 up

Primary source of reference: https://docs.redhat.com/en/documentatio … ip-address

Any ideas is much appreciated, this is driving me crazy. I have a feeling it's supposed to work if I run the second block of commands in a particular order. But from google search, it also seems like they shouldn't be necessary and simply restart the libvirtd.service is enough. I'm thinking about switch to bridge interface, but I'm not sure if it's a good idea to leave the host using the bridge network permanently even if I don't interact with virtual machines any more, or if it's okay to easily switch between bridged networking and "regular" networking depending on whether I work with the VMs on the host. I assume it would disrupt internet connection (however briefly, which can be an issue for dropped downloads).

Last edited by zf (2024-11-21 21:45:10)

Lone_Wolf · 2024-11-23 15:57:21

The redhat guide mentions 2 commands to verify settings, and a 3rd to set the static address.

What are the outputs if you use the 3 commands from that guide ?

Moderator Note: Moving to Networking, Server, and Protection board.

zf · 2024-11-23 18:43:30

Lone_Wolf wrote:

The redhat guide mentions 2 commands to verify settings, and a 3rd to set the static address.
What are the outputs if you use the 3 commands from that guide ?

Moderator Note: Moving to Networking, Server, and Protection board.

$ virsh domiflist arch-vm
Interface Type Source Model MAC
-------------------------------------------------------------
vnet0 network default virtio 52:54:00:99:3b:1d

$ virsh net-dumpxml default | egrep 'range|host\ mac'
egrep: warning: egrep is obsolescent; using grep -E
grep: warning: stray \ before white space
<range start='192.168.122.2' end='192.168.122.254'/>
<host mac='52:54:00:99:3B:1D' ip='198.168.122.201'/>

$ virsh net-update default add ip-dhcp-host '<host mac="52:54:00:99:3B:1D" ip="198.168.122.101"/>' --live --config

error: Failed to update network default
error: Requested operation is not valid: there is an existing dhcp host entry in network 'default' that matches "<host mac='52:54:00:99:3B:1D' name='(null)' ip='198.168.122.101'/>"

Last command fails because it was already added (no errors when it was initially added).

Last edited by zf (2024-11-23 18:44:10)

Arch Linux

#1 2024-11-21 21:40:59

[libivrt] Static IP address not being used by guest machine

#2 2024-11-23 15:57:21

Re: [libivrt] Static IP address not being used by guest machine

#3 2024-11-23 18:43:30

Re: [libivrt] Static IP address not being used by guest machine

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