On 06/16/2017 12:21 PM, jean-christophe manciot wrote:
Yes, except that it *does not work*. As you can see below, libnss-libvirt is installed and configured, but the VM "KVM-Ubuntu-GNS3-Server-17.04" is not reachable through its DNS name.
libvirt-nss is not for translating DNS names, rather than libvirt guest names. That is, # virsh start myAwesomeDomain # ssh myAwesomeDomain
# apt-cache policy libnss-libvirt libnss-libvirt: Installed: 3.0.0-4 ... # cat /etc/nsswitch.conf passwd: compat group: compat shadow: compat
hosts: files libvirt libvirt_guest mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns networks: files
protocols: db files services: db files ethers: db files rpc: db files
netgroup: nis
# systemctl status libvirtd ● libvirtd.service - Virtualization daemon Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled) Active: active (running) since Fri 2017-06-16 11:44:59 CEST; 11min ago Docs: man:libvirtd(8) http://libvirt.org Main PID: 9448 (libvirtd) CPU: 1.790s CGroup: /system.slice/libvirtd.service ├─ 5556 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/virtual-mgt-5.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ├─ 5557 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/virtual-mgt-5.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ... ├─ 8805 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ├─ 8806 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper ├─ 9448 /usr/sbin/libvirtd └─15116 qemu-system-x86_64 -enable-kvm -name guest=KVM-Ubuntu-GNS3-Server-17.04,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/
... Jun 16 11:55:14 samsung-ubuntu dnsmasq-dhcp[8805]: DHCPREQUEST(virbr0) 192.168.122.124 52:54:00:03:9f:9f Jun 16 11:55:14 samsung-ubuntu dnsmasq-dhcp[8805]: DHCPACK(virbr0) 192.168.122.124 52:54:00:03:9f:9f KVM-Ubuntu-GNS3-Server-17 # ping KVM-Ubuntu-GNS3-Server-17.04 ping: KVM-Ubuntu-GNS3-Server-17.04: Name or service not known # ping KVM-Ubuntu-GNS3-Server-17.04.actionmystique.net ping: KVM-Ubuntu-GNS3-Server-17.04.actionmystique.net: Name or service not known # ping 192.168.122.124 PING 192.168.122.124 (192.168.122.124) 56(84) bytes of data. 64 bytes from 192.168.122.124: icmp_seq=1 ttl=64 time=0.181 ms 64 bytes from 192.168.122.124: icmp_seq=2 ttl=64 time=0.165 ms
This suggests your DNS server might be misconfigured. Does it have a record for the guest you're running?
A few possible explanations for that issue are: - something is not configured correctly - there is an incompatibility with NetworkManager - there is a bug with libnss-libvirt
That's possible. Can you see the guest in: /var/lib/libvirt/dnsmasq/virbr0.{macs,status} That's where the nss module gets translations from. Also, looks like you're using 3.0.0 release. You need to restart the network after you've set up the NSS module. The decision whether to create those files is made when libvirt starts a network. Only in 3.3.0 release we're making that decision more frequently and thus the restart is not needed. virsh net-destroy virtual-mgt-5 virsh net-start virtual-mgt-5 Michal