LWRESD(8)                            BIND9                           LWRESD(8)



NAME
       lwresd - lightweight resolver daemon

SYNOPSIS
       lwresd [-c config-file] [-C config-file] [-d debug-level] [-f] [-g]
              [-i pid-file] [-m flag] [-n #cpus] [-P port] [-p port] [-s]
              [-t directory] [-u user] [-v] [-4] [-6]

DESCRIPTION
       lwresd is the daemon providing name lookup services to clients that use
       the BIND 9 lightweight resolver library. It is essentially a
       stripped-down, caching-only name server that answers queries using the
       BIND 9 lightweight resolver protocol rather than the DNS protocol.

       lwresd listens for resolver queries on a UDP port on the IPv4 loopback
       interface, 127.0.0.1. This means that lwresd can only be used by
       processes running on the local machine. By default, UDP port number 921
       is used for lightweight resolver requests and responses.

       Incoming lightweight resolver requests are decoded by the server which
       then resolves them using the DNS protocol. When the DNS lookup
       completes, lwresd encodes the answers in the lightweight resolver
       format and returns them to the client that made the request.

       If /etc/resolv.conf contains any nameserver entries, lwresd sends
       recursive DNS queries to those servers. This is similar to the use of
       forwarders in a caching name server. If no nameserver entries are
       present, or if forwarding fails, lwresd resolves the queries
       autonomously starting at the root name servers, using a built-in list
       of root server hints.

OPTIONS
       -4
           Use IPv4 only even if the host machine is capable of IPv6.  -4 and
           -6 are mutually exclusive.

       -6
           Use IPv6 only even if the host machine is capable of IPv4.  -4 and
           -6 are mutually exclusive.

       -c config-file
           Use config-file as the configuration file instead of the default,
           /etc/lwresd.conf.  -c can not be used with -C.

       -C config-file
           Use config-file as the configuration file instead of the default,
           /etc/resolv.conf.  -C can not be used with -c.

       -d debug-level
           Set the daemon's debug level to debug-level. Debugging traces from
           lwresd become more verbose as the debug level increases.

       -f
           Run the server in the foreground (i.e. do not daemonize).

       -g
           Run the server in the foreground and force all logging to stderr.

       -i pid-file
           Use pid-file as the PID file instead of the default,
           /var/run/lwresd/lwresd.pid.

       -m flag
           Turn on memory usage debugging flags. Possible flags are usage,
           trace, record, size, and mctx. These correspond to the
           ISC_MEM_DEBUGXXXX flags described in <isc/mem.h>.

       -n #cpus
           Create #cpus worker threads to take advantage of multiple CPUs. If
           not specified, lwresd will try to determine the number of CPUs
           present and create one thread per CPU. If it is unable to determine
           the number of CPUs, a single worker thread will be created.

       -P port
           Listen for lightweight resolver queries on port port. If not
           specified, the default is port 921.

       -p port
           Send DNS lookups to port port. If not specified, the default is
           port 53. This provides a way of testing the lightweight resolver
           daemon with a name server that listens for queries on a
           non-standard port number.

       -s
           Write memory usage statistics to stdout on exit.
                  Note: This option is mainly of interest to BIND 9 developers
                  and may be removed or changed in a future release.

       -t directory
           Chroot to directory after processing the command line arguments,
           but before reading the configuration file.
                  Warning: This option should be used in conjunction with the
                  -u option, as chrooting a process running as root doesn't
                  enhance security on most systems; the way chroot(2) is
                  defined allows a process with root privileges to escape a
                  chroot jail.

       -u user
           Setuid to user after completing privileged operations, such as
           creating sockets that listen on privileged ports.

       -v
           Report the version number and exit.

FILES
       /etc/resolv.conf
           The default configuration file.

       /var/run/lwresd.pid
           The default process-id file.

SEE ALSO
       named(8), lwres(3), resolver(5).

AUTHOR
       Internet Systems Consortium

COPYRIGHT
       Copyright  2004, 2005, 2007-2009, 2014 Internet Systems Consortium,
       Inc. ("ISC")
       Copyright  2000, 2001 Internet Software Consortium.



BIND9                          January 20, 2009                      LWRESD(8)

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