My VMs don't get IP with libvirt and dnsmasq

[Daniel Romero]

Hi,

I've seen this before.

First,  the simple steps:

have you started that network? (virsh start network-name)
do you have installed the tools to work with bridges in your OS?
can you check if the bridge exist in your OS and if the vm's interface is
attached to it? In rhel you use the command brctl to do that, don't know
about ubuntu...


Best Regards,
DR


On Thu, Apr 16, 2020 at 7:32 PM Computers Issues <
computerslover123 at gmail.com> wrote:

> Hello there,
>
> I wanted to share a problem I'm having with libvirt, for the case someone
> here could know how to solve it.
>
> I'm using an Ubuntu 18.04 LTS, I have libvirtd already installed and I
> think I got all the dependencies installed. So, I'm using virsh net-create
> to create this network:
>
> <network>
>     <name>pepito</name>
>     <forward mode='nat'/>
>     <bridge name='virbr2' stp='on' delay='0'/>
>     <ip address='192.168.150.1' netmask='255.255.255.0'>
>         <dhcp>
>             <range start='192.168.150.2' end='192.168.150.254'/>
>         </dhcp>
>     </ip>
> </network>
>
> And then I create a domain with this xml:
>
> <domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0
> '>
>   <name>ARM</name>
>   <memory unit='KiB'>262144</memory>
>   <currentMemory unit='KiB'>262144</currentMemory>
>   <os>
>     <type arch='armv7l' machine='virt-2.9'>hvm</type>
>     <kernel>~/zImage</kernel>
>     <cmdline>console=ttyAMA0 root=/dev/vda</cmdline>
>     <boot dev='hd'/>
>   </os>
>
>   <on_poweroff>destroy</on_poweroff>
>   <on_reboot>restart</on_reboot>
>   <on_crash>destroy</on_crash>
>   <devices>
>     <emulator>/usr/bin/qemu-system-aarch64</emulator>
>       <disk type='file' device='disk'>
>       <driver name='qemu' type='qcow2'/>
>       <source file=' ~/rootfs.qcow2'/>
>       <target dev='hda' bus='virtio'/>
>       </disk>
>     <controller type='virtio-serial' index='0'>
>       <address type='virtio-mmio'/>
>     </controller>
>     <interface type='network'>
>       <mac address='52:54:00:09:a4:37'/>
>       <model type='virtio'/>
>       <source network='pepito'/>
>       <address type='virtio-mmio'/>
>     </interface>
>  </devices>
> <qemu:commandline>
>   <qemu:arg value='-device'/>
>         <qemu:arg value='virtio-net-pci'/>
>         <qemu:arg value='-netdev'/>
>         <qemu:arg value='user,id=net1'/>
>   </qemu:commandline>
> </domain>
>
> They both work as I created them in a different computer and everything
> works. But I'm trying it on my other Ubuntu machine, and once virsh creates
> the network and the domain, my VM never get an IP from that DHCP range.
> This is libvirtd log:
>
> abr 17 00:48:11 usuario-System-Product-Name dnsmasq-dhcp[13741]: DHCP, IP
> range 192.168.150.2 -- 192.168.150.254, lease time 1h
> abr 17 00:48:11 usuario-System-Product-Name dnsmasq-dhcp[13741]: DHCP,
> sockets bound exclusively to interface virbr2
> abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: reading
> /etc/resolv.conf
> abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: using
> nameserver 127.0.0.53#53
> abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: read
> /etc/hosts - 7 addresses
> abr 17 00:48:11 usuario-System-Product-Name dnsmasq[13741]: read
> /var/lib/libvirt/dnsmasq/pepito.addnhosts - 0 addresses
> abr 17 00:48:11 usuario-System-Product-Name dnsmasq-dhcp[13741]: read
> /var/lib/libvirt/dnsmasq/pepito.hostsfile
>
>
> Does anybody know why it could be that the VM never gets an IP from the
> range I defined? As I said, exactly the same configuration worked in a
> different machine, I don't know why it does not work here.
>
> Thank you so much!!
>
>
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