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Channels are used in conjunction with categories. A category is a particular type of logging data; for example, a category could contain logging entries related to configuration changes. Each category of logging information can be directed to one or more channels. Table 11-5 defines the key categories.

The default category defines the logging options for those categories where no specific configuration has been defined. Any messages that are not defined into a particular category. This is a catchall for these messages. Security-related messages. Configuration messages. Incoming zone transfer messages. Outgoing zone transfer messages. Client request processing messages. Network operations messages. DNSSEC and TSIG messages. Lame server reports.

You can specify one or more channels for each category. Listing 11-5 specified only one category, default, and directed it to the default_syslog channel, like so: category default { default_syslog; }; But you can also specify multiple categories and multiple channels, like so: category default { default_syslog; debug_log; log_file; }; category config { default_syslog; default_debug; }; category dnssec { null; }; I recommend specifying most of the major categories to your syslog or to a specific log file (or both).

Path.Combine()

The options statement controls a variety of BIND configuration options (for example, default ports), the location of various directories and files, and default access controls. Like the logging statement, the option statement does not need to be named. The options statement should appear only once in the named.conf file. The options statement encloses a list of individual options in two possible syntaxes. The first syntax is as follows: option "option value"; Here you enclose the option value in quotation marks and terminate it with a semicolon. The second syntax is as follows: option { option value; }; In this syntax, the option value is enclosed in braces and terminated with a semicolon. The option itself is also terminated with a semicolon after the closing brace.

Listing 11-8 shows a selection of basic options. Let s walk through each of these and look at related and other options available to use. I will specifically focus on the security and access control options, but I will also cover the options required to run BIND. Listing 11-8. options Statement options { directory "/"; pid-file "/var/run/named.pid"; version "[null]"; allow-query { trusted; }; query-source address * port 53; }; The first option in Listing 11-8, directory, specifies the default working directory for the named daemon. I have specified / or the root directory. This is either the root directory of the host or, if the named daemon is in a chroot jail, the root directory of the jail. If you have used the directory structure defined in the Chrooting BIND section, then the root directory would be /chroot/named/. I also specified the pid-file option, which allows you to define the location of PID file; I have used /var/run/named.pid. Another related option you could use is statistics-file, which allows you to specify a location for the BIND statistics file. You can use this option like so: statistics-file "/var/named.stats"; This file is used when the rndc stats command is run, and it stores the statistics generated by this command.