config add Logging/loggers
 config set Logging/loggers[0]/name *
 config set Logging/loggers[0]/severity INFO
 config add Logging/loggers[0]/output_options
 config set Logging/loggers[0]/output_options[0]/destination file
 config set Logging/loggers[0]/output_options[0]/output /var/log/dnslog
 config set Logging/loggers[0]/output_options[0]/maxsize 204800
 config set Logging/loggers[0]/output_options[0]/maxver 8
 config commit