[libvirt] Making DHCP leases available to local DNS server through dnsmasq

Hello everyone, I have multiple virtual networks defined on my Server: # virsh net-list --all Name State Autostart Persistent ---------------------------------------------------------- default active yes yes ... virtual-mgt-5 active yes yes ... When a VM is started on one of them with an interface which needs the dnsmasq DHCP server to get its IP address/len, it remains inaccessible with the FQDN once the IP information is acquired. The default values are used for each dnsmasq instance: ● libvirtd.service - Virtualization daemon Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2017-06-10 19:48:58 CEST; 3ms ago Docs: man:libvirtd(8) http://libvirt.org Main PID: 25365 (libvirtd) Tasks: 35 (limit: 4915) Memory: 27.1M CPU: 28ms CGroup: /system.slice/libvirtd.service ├─22262 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ├─22263 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ... ├─24061 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/virtual-mgt-5.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ├─24062 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/virtual-mgt-5.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ... ├─25365 /usr/sbin/libvirtd └─25384 /usr/sbin/dnsmasq --help I wonder whether the option "--leasefile-ro" gets in the way or not: there must be a key=value in /etc/libvirt/qemu/networks/<virtual_network>.xml to enable this behavior, but could not find it in the Network XML format <https://libvirt.org/formatnetwork.html>;. The contents of my XML file are: <network ipv6='yes'> <name>virtual-mgt-5</name> <uuid>193ac2c9-13fc-44a6-83f8-477790f1f470</uuid> <forward mode='route'/> <bridge name='virbr5' stp='on' delay='0'/> <mac address='52:54:00:b9:ea:63'/> <domain name='actionmystique.net'/> <ip address='172.21.0.1' netmask='255.255.0.0'> <dhcp> <range start='172.21.0.1' end='172.21.255.254'/> </dhcp> </ip> <ip family='ipv6' address='fc21::1' prefix='64'> <dhcp> <range start='fc21::1' end='fc21::fffe'/> </dhcp> </ip> </network> Any suggestion? -- Jean-Christophe