Troubleshooting DHCP with dnsmasq

1 Check the log files
2 Check lease files for a VLAN tag
3 Check lease files with dnsmasq-cli
4 Check that dnsmasq is running
5 No hypervisors found error

Check the log files

The log file for the Dnsmasq remote service is found at /opt/abiquo/tomcat/logs/dnsmasq-servlet.log.

The virtualfactory.log and catalina.out files may also contain information about the Dnsmasq remote service.

Check lease files for a VLAN tag

To check the DHCP configuration created by the restore, display the files /opt/abiquo/dhcp/\{vlanTag} in the hosts and addn_hosts folder.

root@dnsmasqserver admin]# cat /opt/abiquo/dhcp/2/addn_hosts/00_50_56_*
192.168.0.1 host-192-168-0-1.default_private_network.local host-192-168-0-1
192.168.0.4 host-192-168-0-4.default_private_network.local host-192-168-0-4
192.168.0.2 host-192-168-0-2.default_private_network.local host-192-168-0-2
192.168.0.3 host-192-168-0-3.default_private_network.local host-192-168-0-3

[root@dnsmasqserver admin]# cat /opt/abiquo/dhcp/2/host/00_50_56_*
00:50:56:14:ac:f7,host-192-168-0-1.default_private_network.local,192.168.0.1
00:50:56:17:12:8e,host-192-168-0-4.default_private_network.local,192.168.0.4
00:50:56:29:6d:87,host-192-168-0-2.default_private_network.local,192.168.0.2
00:50:56:34:5d:0c,host-192-168-0-3.default_private_network.local,192.168.0.3

Check lease files with dnsmasq-cli

To use the dnsmasq CLI script to list the configuration for a VLAN tag (e.g. 5), use the dnsmasq-cli command with the IP address of the Dnsmasq remote service. For example, for version 5.1.0

java -jar dnsmasq-cli-5.1.0.jar -s "http://10.60.11.2:8009/dnsmasq" -t 5 list

Check that dnsmasq is running

The Dnsmasq remote service should run an instance of dnsmasq for each VLAN. To check for the instances of dnsmasq running on the server use the following command.

ps aux | grep -i dnsmasq

Example of results

No hypervisors found error

When you run the dnsmasq-restore tool, an error may appear that begins with "No hypervisors found" and ends with "Cannot create vlan default_private_network with tag X".

This error appears when there is already an instance of dnsmasq running for this VLAN.

dnsmasq-restore tool command and error

To resolve this error, use the dnsmasq-restore tool again