By default, BIND will not append DNS queries to /var/log/messages. First, you are going to want to determine if you are using version 8 or version 9 of Bind.

named -v

If you are using version 8 of Bind, issue this command to append DNS queries to /var/log/messages.

ndc querylog

If you are using version 9 of Bind, issue this command to append DNS queries to /var/log/messages.

rndc querylog

The following should be displayed in /var/log/messages.

Aug 30 06:28:35 dns1 named[1099]: received control channel command 'querylog'
Aug 30 06:28:35 dns1 named[1099]: query logging is now on

Likewise, once there is a DNS query, /var/log/messages should have something like this.

Aug 30 06:28:45 dns1 named[1099]: client 192.168.0.15#37974 (server1.example.com): query: server1.example.com IN A + (192.168.0.6)
Aug 30 06:28:45 dns1 named[1099]: client 192.168.0.15#37974 (server1.example.com): query: server1.example.com IN AAAA + (192.168.0.6)

Disable query log

You simply reissue the querylog command to no long append DNS queries to /var/log/messages.

Version 8 of Bind.

ndc querylog

Version 9 of Bind.

rndc querylog

The following should be display in /var/log/messages.

Aug 30 06:31:39 dns1 named[1099]: received control channel command 'querylog'
Aug 30 06:31:39 dns1 named[1099]: query logging is now off