rec_control - Man Page

rec_control [OPTION]... COMMAND [COMMAND-OPTION]...

rec_control allows the operator to query and control a running instance of the PowerDNS Recursor.

rec_control talks to the recursor via a the 'controlsocket'. Which is usually located in /var/run . The --socket-dir or the --config-dir and --config-name switches control to which process rec_control connects.

To see if the Recursor is alive, run:

# rec_control ping

To stop the recursor by hand, run:

# rec_control quit

To dump the cache to disk, execute:

# rec_control dump-cache /tmp/the-cache

NOTE:

Before version 4.5.0, for each command that writes to a file, pdns_recursor would open the file to write to. Starting with 4.5.0, the files are opened by the rec_control command itself using the credentials and the current working directory of the user running rec_control. A single minus - can be used as a filename to write the data to the standard output stream.

--help

provide this helpful message.

--config-dir=<path>

Directory where the recursor.conf lives.

--config-name=<name>

Name of the virtual configuration.

--socket-dir=<path>

Where the controlsocket will live, please use --config-dir instead.

--socket-pid=<pid>

When running in SMP mode, pid of pdns_recursor to control.

--timeout=<num>

Number of seconds to wait for the remote PowerDNS Recursor to respond.

add-dont-throttle-names NAME [NAME...]

Add names for nameserver domains that may not be throttled.

add-dont-throttle-netmasks NETMASK [NETMASK...]

Add netmasks for nameservers that may not be throttled.

add-nta DOMAIN [REASON]

Add a Negative Trust Anchor for DOMAIN, suffixed optionally with REASON.

add-ta DOMAIN DSRECORD

Add a Trust Anchor for DOMAIN with DS record data DSRECORD. This adds the new Trust Anchor to the existing set of Trust Anchors for DOMAIN.

current-queries

Shows the currently active queries.

clear-dont-throttle-names NAME [NAME...]

Remove names that are not allowed to be throttled. If NAME is *, remove all

clear-dont-throttle-netmasks NETMASK [NETMASK...]

Remove netmasks that are not allowed to be throttled. If NETMASK is *, remove all

clear-nta DOMAIN...

Remove Negative Trust Anchor for one or more DOMAINs. Set domain to * to remove all NTA's.

clear-ta [DOMAIN]...

Remove Trust Anchor for one or more DOMAINs. Note that removing the root trust anchor is not possible.

dump-cache FILENAME

Dumps the entire cache to FILENAME. This file should not exist already, PowerDNS will refuse to overwrite it. While dumping, the recursor might not answer questions.

Typical PowerDNS Recursors run multiple threads, therefore you'll see duplicate, different entries for the same domains. The negative cache is also dumped to the same file. The per-thread positive and negative cache dumps are separated with an appropriate comment.

dump-dot-probe-map FILENAME

Dump the contents of the DoT probe map to the FILENAME mentioned.

dump-edns FILENAME

Dumps the EDNS status to the filename mentioned. This file should not exist already, PowerDNS will refuse to overwrite it. While dumping, the recursor will not answer questions.

dump-failedservers FILENAME

Dump the contents of the failed server map to the FILENAME mentioned. This file should not exist already, PowerDNS will refuse to overwrite it otherwise. While dumping, the recursor will not answer questions.

dump-non-resolving FILENAME

Dump the contents of the map of nameserver names that did not resolve to an address.  This file should not exist already, PowerDNS will refuse to overwrite it otherwise. While dumping, the recursor will not answer questions.

dump-nsspeeds FILENAME

Dumps the nameserver speed statistics to the FILENAME mentioned. This file should not exist already, PowerDNS will refuse to overwrite it. While dumping, the recursor will not answer questions. Statistics are kept per thread, and the dumps end up in the same file.

dump-rpz ZONE NAME FILE NAME

Dumps the content of the RPZ zone named ZONE NAME to the FILENAME mentioned. This file should not exist already, PowerDNS will refuse to overwrite it otherwise. While dumping, the recursor will not answer questions. For details on how RPZ are named see https://docs.powerdns.com/recursor/lua-config/rpz.html#policyname.

dump-saved-parent-ns-sets FILE NAME

Dump the entries of the map containing saved parent NS sets that were successfully used in resolving. The total number of entries is also printed in the header. An entry is saved if the recursor sees that the parent set includes names not in the child set. This is an indication of a misconfigured domain.

dump-throttlemap FILENAME

Dump the contents of the throttle map to the FILENAME mentioned. This file should not exist already, PowerDNS will refuse to overwrite it otherwise. While dumping, the recursor will not answer questions.

get STATISTIC [STATISTIC]...

Retrieve a statistic. For items that can be queried, see https://docs.powerdns.com/recursor/metrics.html.

get-all

Retrieve all known statistics.

get-dont-throttle-names

Get the list of names that are not allowed to be throttled.

get-dont-throttle-netmasks

Get the list of netmasks that are not allowed to be throttled.

get-ntas

Get a list of the currently configured Negative Trust Anchors.

get-tas

Get a list of the currently configured Trust Anchors.

get-parameter KEY [KEY]...

Retrieves the specified configuration parameter(s).

get-proxymapping-stats

Get the list of proxy-mapped subnets and associated counters.

get-qtypelist

Retrieves QType statistics. Queries from cache aren't being counted yet.

get-remotelogger-stats

Retrieves the remote logger statistics, per type and address.

hash-password [WORK-FACTOR]

Asks for a password then returns the hashed and salted version, to use as a webserver password or API key. This command does not contact the recursor but does the hashing inside rec_control. An optional scrypt work factor can be specified, in power of two. The default is 1024.

help

Shows a list of supported commands understood by the running pdns_recursor

list-dnssec-algos

List supported (and potentially disabled) DNSSEC algorithms.

ping

Check if server is alive.

quit

Request shutdown of the recursor, exiting the process while letting the OS clean up resources.

quit-nicely

Request nice shutdown of the recursor. This method allows all threads to finish their current work and releases resources before exiting. This is the preferred method to stop the recursor.

reload-acls

Reloads ACLs.

reload-lua-script [FILENAME]

(Re)loads Lua script FILENAME. If FILENAME is empty, attempt to reload the currently loaded script. This replaces the script currently loaded.

reload-lua-config [FILENAME]

(Re)loads Lua configuration FILENAME. If FILENAME is empty, attempt to reload the currently loaded file. Note that FILENAME will be fully executed, any settings changed at runtime that are not modified in this file, will still be active. The effects of reloading do not always take place immediately, as some subsystems reload and replace configuration in an asynchronous way.

reload-zones

Reload authoritative and forward zones. Retains current configuration in case of errors.

set-carbon-server CARBON SERVER [CARBON OURNAME]

Set the carbon-server setting to CARBON SERVER. If CARBON OURNAME is not empty, also set the carbon-ourname setting to CARBON OURNAME.

set-dnssec-log-bogus SETTING

Set dnssec-log-bogus setting to SETTING. Set to on or yes to log DNSSEC validation failures and to no or off to disable logging these failures.

set-ecs-minimum-ttl NUM

Set ecs-minimum-ttl-override to NUM.

set-max-aggr-nsec-cache-size NUM

Change the maximum number of entries in the NSEC aggressive cache. If the cache is disabled by setting its size to 0 in the config, the cache size cannot be set by this command. Setting the size to 0 by this command still keeps the cache, but makes it mostly ineffective as it is emptied periodically.

set-max-cache-entries NUM

Change the maximum number of entries in the DNS cache.  If reduced, the cache size will start shrinking to this number as part of the normal cache purging process, which might take a while.

set-max-packetcache-entries NUM

Change the maximum number of entries in the packet cache.  If reduced, the cache size will start shrinking to this number as part of the normal cache purging process, which might take a while.

set-minimum-ttl NUM

Set minimum-ttl-override to NUM.

set-event-trace-enabled NUM

Set logging of event trace messages, 0 = disabled, 1 = protobuf, 2 = log file, 3 = protobuf and log file.

show-yaml [FILE]

Show Yaml representation of odl-style config.

top-queries

Shows the top-20 queries. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-pub-queries

Shows the top-20 queries grouped by public suffix list. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-largeanswer-remotes

Shows the top-20 remote hosts causing large answers. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-remotes

Shows the top-20 most active remote hosts. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-servfail-queries

Shows the top-20 queries causing servfail responses. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-bogus-queries

Shows the top-20 queries causing bogus responses. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-pub-servfail-queries

Shows the top-20 queries causing servfail responses grouped by public suffix list. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-pub-bogus-queries

Shows the top-20 queries causing bogus responses grouped by public suffix list. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-servfail-remotes

Shows the top-20 most active remote hosts causing servfail responses. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-bogus-remotes

Shows the top-20 most active remote hosts causing bogus responses. Statistics are over the last 'stats-ringbuffer-entries' queries.

top-timeouts

Shows the top-20 most active downstream timeout destinations. Statistics are over the last 'stats-ringbuffer-entries' queries.

trace-regex REGEX FILE

Emit resolution trace for matching queries. No arguments disables tracing. Before version 4.9.0, there was no FILE argument, traces were always written to the log. Starting with version 4.9.0, trace information is written to the file specified, which may be - for the standard out stream.

Queries matching this regular expression will generate voluminous tracing output. Be aware that matches from the packet cache will still not generate tracing. To unset the regex, pass trace-regex without a new regex.

The regular expression is matched against domain queries terminated with a dot. For example the regex 'powerdns.com$' will not match a query for 'www.powerdns.com', since the attempted match will be with 'www.powerdns.com.'.

In addition, since this is a regular expression, to exclusively match queries for 'www.powerdns.com', one should escape the dots: '^www\.powerdns\.com\.$'. Note that the single quotes prevent further interpretation of the backslashes by the shell.

Multiple matches can be chained with the | operator. For example, to match all queries for Dutch (.nl) and German (.de) domain names, use: '\.nl\.$|\.de\.$'.

unload-lua-script

Unloads Lua script if one was loaded.

version

Report running version.

wipe-cache DOMAIN [DOMAIN] [...]

Wipe entries for DOMAIN (exact name match) from the cache. This is useful if, for example, an important server has a new IP address, but the TTL has not yet expired. Multiple domain names can be passed. DOMAIN can be suffixed with a $. to delete the whole tree from the cache. i.e. powerdns.com$ will remove all cached entries under and including the powerdns.com name.

Note: this command also wipes the negative cache.

Warning: Don't just wipe "www.somedomain.com", its NS records or CNAME target may still be undesired, so wipe "somedomain.com" as well.

wipe-cache-typed qtype DOMAIN [DOMAIN] [...]

Same as wipe-cache, but only wipe records of type qtype.

pdns_recursor(1) https://docs.powerdns.com/recursor

PowerDNS.COM BV

PowerDNS.COM BV

pdns_recursor(1), pmdapdns(1).