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RPC.LOCKD(8)              BSD System Manager's Manual             RPC.LOCKD(8)

NAME
     rpc.lockd -- NFS file locking daemon

SYNOPSIS
     rpc.lockd [-d debug_level] [-g grace_period] [-x host_monitor_cache_period]

DESCRIPTION
     The rpc.lockd utility provides monitored and unmonitored file and record locking services in an NFS
     environment.  To monitor the status of hosts requesting locks, the locking daemon typically operates in
     conjunction with rpc.statd(8).

     The rpc.lockd utility runs whenever its services are needed to support either the NFS server (see
     nfsd(8)) or the NFS client (an NFS file system on which file locking requests have been made).  The
     daemon will remain running until a short time after its services are no longer needed to support either
     the NFS client or NFS server.  rpc.lockd will also make sure that the statd service (on which it
     depends) is running.

     The following is a list of command line options that are available.  However, since rpc.lockd is nor-mally normally
     mally started by launchd(8), configuration of these options should be controlled using the equivalent
     settings in the NFS configuration file.  See nfs.conf(5) for a list of tunable parameters.

     -d      The -d option causes debugging information to be written to syslog, recording all RPC transac-tions transactions
             tions to the daemon.  These messages are logged with level LOG_DEBUG and facility LOG_DAEMON.
             Specifying a debug_level of 1 results in the generation of one log line per protocol operation.
             Higher debug levels can be specified, causing display of operation arguments and internal oper-ations operations
             ations of the daemon.

     -g      The -g option allows to specify the grace period (in seconds).  During the grace period
             rpc.lockd only accepts requests from hosts which are reinitialising locks which existed before
             the server restart.  Default is 45 seconds.

     -x      The -x option tells rpc.lockd how long to cache state records for monitored hosts.  Setting it
             to zero will disable the cache which will make lock and unlock requests from a single client
             more expensive because of additional interaction with the client's statd.  The default cache
             time is 60 seconds.

     Error conditions are logged to syslog, irrespective of the debug level, using log level LOG_ERR and
     facility LOG_DAEMON.

FILES
     /var/run/lockd.pid              The pid of the current lockd daemon.
     /System/Library/LaunchDaemons/com.apple.lockd.plist
                                     The lockd service's property list file for launchd(8).
     /usr/include/rpcsvc/nlm_prot.x  RPC protocol specification for the network lock manager protocol.

SEE ALSO
     nfs.conf(5), rpc.statd(8), syslog(3), launchd(8)

BUGS
     The current implementation serialises locks requests that could be shared.

STANDARDS
     The implementation is based on the specification in "Protocols for X/Open PC Interworking: XNFS, Issue
     4", X/Open CAE Specification C218, ISBN 1 872630 66 9.

HISTORY
     A version of rpc.lockd appeared in SunOS 4.

BSD                             January 9, 2007                            BSD