RPC.LOCKD(8)

NAME
rpc.lockd - NFS file locking daemon

SYNOPSIS
rpc.lockd [-d debug_level] [-g grace 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).

Options and operands available for rpc.lockd:

-d  The -d option causes debugging information to be written to syslog, recording all RPC transactions 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 operations of the daemon.

-g  The -g option allow 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 30 seconds.

-w  The -w option tells rpc.lockd to wait until the first client locking request is made before starting the locking daemon(s). This may be used on NFS clients to defer starting the NFS locking daemons until it is known that they will be needed. (Note: rpc.statd(8) will also be started if it isn't already running)

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

The rpc.lockd utility must NOT be invoked by inetd(8) because the protocol assumes that the daemon will run from system start time. Instead, it should be configured in rc.conf(5) to run at system startup.

FILES
/usr/include/rpcsvc/nlm_prot.x
    RPC protocol specification for the network lock manager protocol.

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

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

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

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