RPC.LOCKD(8) | System Manager's Manual | RPC.LOCKD(8) |
rpc.lockd
— NFS
file locking daemon
rpc.lockd |
[-d debug_level]
[-g grace_period]
[-x
host_monitor_cache_period] |
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 normally
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
-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
-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
-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
.
lockd
daemon.lockd
service's property list file for
launchd(8).The current implementation serialises locks requests that could be shared.
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.
A version of rpc.lockd
appeared in SunOS
4.
January 9, 2007 | macOS 15.0 |