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How to use Dnsmasq for libvirt specific instances?
Although the configuration files for the libvirt instances is kept in the “/var/lib/libvirt/dnsmasq” directory, changes you make to these files will be overwritten, so modifying them directly is not an option – instead you need to use virsh. The libvirt specific instances of dnsmasq use the DNS server the host machine has defined as upstream.
How to use Dnsmasq for Linux host servers?
KVM: Using dnsmasq for libvirt DNS resolution On Linux host servers, libvirt uses a separate instance of dnsmasq for each virtual network. So if you want full name and reverse lookup for KVM guests on the default 192.168.122.0 network, you can configure this particular dnsmasq instance using virsh.
How to validate a Dnsmasq instance in KVM?
Validate by doing a name and reverse lookup on this local dnsmasq instance. If you want to prove to yourself that the virtual network specific instances will use the host service instance for upstream, then do a ‘virsh net-edit default’ and remove the section and restart the default network.
How to resolve DNS in virsh net specific instance?
If you want to prove to yourself that the virtual network specific instances will use the host service instance for upstream, then do a ‘virsh net-edit default’ and remove the section and restart the default network. Then do a lookup on the 192.168.122 specific instance, and notice it still resolves.
How does libvirt work with the host firewall?
Libvirt will optionally also provide DHCP services to the virtual network using DNSMASQ. In all cases, we need to allow DNS/DHCP queries to the host OS. Since we can’t predict whether the host firewall setup is already allowing this, we insert 4 rules into the head of the INPUT chain
Is there a Dnsmasq instance for KVM guest?
So if you want full name and reverse lookup for KVM guests on the default 192.168.122.0 network, you can configure this particular dnsmasq instance using virsh.