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Libvirt error Unable to resolve address name or service not known
This article covers tips to fix 'Libvirt error: Unable to resolve address: name or service not known'.
QEMU guest migration fails and this error message appears:
# virsh migrate qemu qemu+tcp://192.168.122.12/system error: Unable to resolve address name_of_host service '49155': Name or service not known
Note that the address used for migration data cannot be automatically determined from the address used for connecting to destination libvirtd (for example, from qemu+tcp://192.168.122.12/system).
This is because to communicate with the destination libvirtd, the source libvirtd may need to use network infrastructure different from that which virsh (possibly running on a separate machine) requires.
To fix Libvirt error: Unable to resolve address: name or service not known:
The best solution is to configure DNS correctly so that all hosts involved in migration are able to resolve all host names.
If DNS cannot be configured to do this, a list of every host used for migration can be added manually to the /etc/hosts file on each of the hosts.
However, it is difficult to keep such lists consistent in a dynamic environment.
i. If the host names cannot be made resolvable by any means, virsh migrate supports specifying the migration host:
# virsh migrate qemu qemu+tcp://192.168.122.12/system tcp://192.168.122.12
Destination libvirtd will take the tcp://192.168.122.12 URI and append an automatically generated port number.
ii. If this is not desirable (because of firewall configuration, for example), the port number can be specified in this command:
# virsh migrate qemu qemu+tcp://192.168.122.12/system tcp://192.168.122.12:12345
iii. Another option is to use tunnelled migration. Tunnelled migration does not create a separate connection for migration data, but instead tunnels the data through the connection used for communication with destination libvirtd (for example, qemu+tcp://192.168.122.12/system):
# virsh migrate qemu qemu+tcp://192.168.122.12/system --p2p --tunnelled
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