| 6127 | | <sect2 id="rec-control"><title>Controlling and querying the recursor</title> |
| 6128 | | <para> |
| 6129 | | To control and query the PowerDNS recursor, the tool <filename>rec_control</filename> is provided. This program |
| 6130 | | talks to the recursor over the 'controlsocket', often stored in <filename>/var/run</filename>. |
| 6131 | | </para> |
| 6132 | | <para> |
| 6133 | | As a sample command, try: |
| 6134 | | <screen> |
| 6135 | | # rec_control ping |
| 6136 | | pong |
| 6137 | | </screen> |
| 6138 | | </para> |
| 6139 | | <para> |
| 6140 | | When not running as root, <command>--socket-dir=/tmp</command> might be appropriate. |
| 6141 | | </para> |
| | 6127 | </sect1> |
| | 6128 | <sect1 id="rec-control"><title>Controlling and querying the recursor</title> |
| | 6129 | <para> |
| | 6130 | To control and query the PowerDNS recursor, the tool <filename>rec_control</filename> is provided. This program |
| | 6131 | talks to the recursor over the 'controlsocket', often stored in <filename>/var/run</filename>. |
| | 6132 | </para> |
| | 6133 | <para> |
| | 6134 | As a sample command, try: |
| | 6135 | <screen> |
| | 6136 | # rec_control ping |
| | 6137 | pong |
| | 6138 | </screen> |
| | 6139 | </para> |
| | 6140 | <para> |
| | 6141 | When not running as root, <command>--socket-dir=/tmp</command> might be appropriate. |
| | 6142 | </para> |
| 6223 | | </note> |
| 6224 | | </para> |
| 6225 | | <para> |
| 6226 | | Verisign, the current operator of the COM and NET zones, decided to add a wildcard record so as to draw all queries for non-existing |
| 6227 | | domains to their own page, which lists domains you might want to visist instead. |
| 6228 | | </para> |
| 6229 | | <para> |
| 6230 | | To reinstate old behaviour, add <command>delegation-only=com,net</command> to your recursor configuration. |
| 6231 | | </para> |
| 6232 | | <para> |
| 6233 | | What this does is reject all authoritative answers from the COM and NET servers. ISC, the current maintainers of BIND, have |
| 6234 | | implemented this feature first, PowerDNS has mostly copied their algorithm. Thanks! |
| 6235 | | </para> |
| 6236 | | <para> |
| 6237 | | Verisign might decide to evade our tactic with wildcard NS records, by which time other measures will be needed to restore the |
| 6238 | | old behaviour. |
| 6239 | | </para> |
| 6240 | | </sect2> |
| 6241 | | |
| 6242 | | |
| | 6227 | </listitem> |
| | 6228 | <listitem> |
| | 6229 | <para> |
| | 6230 | Compile using g++ 4.1 or later. This compiler really does a good job on PowerDNS, much better than 3.4 or 4.0. |
| | 6231 | </para> |
| | 6232 | </listitem> |
| | 6233 | <listitem> |
| | 6234 | <para> |
| | 6235 | Consider performing a 'profiled build' as described in the README. This is good for a 20% performance boost in some cases. |
| | 6236 | </para> |
| | 6237 | </listitem> |
| | 6238 | <listitem> |
| | 6239 | <para> |
| | 6240 | When running with >3000 queries per second, and running Linux versions prior to 2.6.17 on some motherboards, your computer may |
| | 6241 | spend an inordinate amount of time working around an ACPI bug for each call to gettimeofday. This is solved by rebooting with 'clock=tsc' |
| | 6242 | or upgrading to a 2.6.17 kernel. |
| | 6243 | </para> |
| | 6244 | <para> |
| | 6245 | The above is relevant if dmesg shows <command>Using pmtmr for high-res timesource</command> |
| | 6246 | </para> |
| | 6247 | </listitem> |
| | 6248 | </itemizedlist> |
| | 6249 | Following the instructions above, you should be able to attain very high query rates. |
| | 6250 | </para> |
