Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #9
Difficulty: Easy
A CD-ROM is a type of optical disc that originated in 1982 in South Korea.
True or False?
Linux & Unix Commands - Search Man Pages

rpc.lockd(8) [freebsd man page]

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] [-h bindip] [-p port] 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 dae- mon. -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. -h bindip Specify specific IP addresses to bind to. This option may be specified multiple times. If no -h option is specified, rpc.lockd will bind to INADDR_ANY. Note that when specifying IP addresses with -h, rpc.lockd will automatically add 127.0.0.1 and if IPv6 is enabled, ::1 to the list. -p The -p option allow to force the daemon to bind to the specified port, for both AF_INET and AF_INET6 address families. 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) 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. BUGS
The current implementation serialises locks requests that could be shared. BSD
November 2, 2007 BSD

Check Out this Related Man Page

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

NAME
rpc.statd -- host status monitoring daemon SYNOPSIS
rpc.statd [-d] DESCRIPTION
rpc.statd is a daemon which co-operates with rpc.statd daemons on other hosts to provide a status monitoring service. The daemon accepts requests from programs running on the local host (typically, rpc.lockd(8), the NFS file locking daemon) to monitor the status of specified hosts. If a monitored host crashes and restarts, the remote daemon will notify the local daemon, which in turn will notify the local pro- gram(s) which requested the monitoring service. Conversely, if this host crashes and restarts, when rpc.statd restarts, it will notify all of the hosts which were being monitored at the time of the crash. Options and operands available for rpc.statd : -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. Error conditions are logged irrespective of this option, using level LOG_ERR. The rpc.statd daemon 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
/var/db/statd.status non-volatile record of currently monitored hosts. /usr/include/rpcsvc/sm_inter.x RPC protocol specification used by local applications to register monitoring requests. SEE ALSO
syslog(3), rc.conf(5), rpc.lockd(8) 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.statd appeared in SunOS 4. BUGS
There is no means for the daemon to tell when a monitored host has disappeared permanently (e.g., catastrophic hardware failure), as opposed to transient failure of the host or an intermediate router. At present, it will retry notification attempts at frequent intervals for 10 minutes, then hourly, and finally gives up after 24 hours. The protocol requires that symmetric monitor requests are made to both the local and remote daemon in order to establish a monitored rela- tionship. This is convenient for the NFS locking protocol, but probably reduces the usefulness of the monitoring system for other applica- tions. The current implementation uses more than 1Kbyte per monitored host in the status file (and also in VM). This may be inefficient for NFS servers with large numbers of clients. BSD
September 19, 1995 BSD

Featured Tech Videos