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Changing dnscache's MAXUDP

Many people try to boost dnscache's performance by increasing the value of MAXUDP in the source. This is not necessarily a good idea, and can often cause more problems than it solves. If you are having performance problems, save your full dnscache logs. Put the logs on the web, and post a message to the djbdns mailing list asking for help, giving the URL for your logs. Be sure to follow all the usual guidelines for that list.

The djbdns-stricthome patch

The djbdns-stricthome patch makes djbdns use conf-home for all absolute filenames. This includes etc/resolv.conf, etc/dnsrewrite, etc/, and etc/dnsroots.local. This is useful for installing djbdns into its own directory (as in a slashpackage system), for installation as a non-root user, or for easy inspection, removal, etc., of the entire package; the package is entirely contained in that directory, except perhaps for symlinks you set up pointing to other locations. With this patch, djbdns can be controlled independently of other packages on the system, or, if uniformity is desired, symlinks to central /etc files can be created. CAVEAT: other packages, such as ucspi-tcp, have their own copies of the djbdns client library, referring to /etc/resolv.conf and /etc/dnsrewrite. It is probably best to avoid using this patch unless you really need it (i.e., you do not have root access).

The cache-effect script

The cache-effect Perl script measures dnscache's cache effectiveness. Its arguments are paths to dnscache service directories. It assumes that the logs in log/main/ include stats and starting lines, and that env/CACHESIZE has not been changed since the last time dnscache was restarted. (See also...)

The dropmatch script

The dropmatch Guile Scheme script looks for dropped, timed-out queries in dnscache's logs. For each such query, it reports the time spent on the query, the query type, and the query name. Pass paths like /service/dnscache/log/main on the command line, or use the script as a multilog !processor.

The logrange script

The logrange Perl script selects a time-based range of log lines from a multilog log directory.

The sort2html script

The sort2html sed script transforms dnstracesort's output into HTML.

The uniq-host script

The uniq-host Perl script looks for duplicated addresses in "=" lines in a tinydns data file.

The zones script

The zones Perl script prints the authoritative zones in a tinydns data file. It handles all allowable representations of domain names, unlike tinydns-showctl.