rpc.statd(8) [freebsd man page]
RPC.STATD(8) BSD System Manager's Manual RPC.STATD(8) NAME
rpc.statd -- host status monitoring daemon SYNOPSIS
rpc.statd [-d] [-h bindip] [-p port] DESCRIPTION
The rpc.statd utility 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 program(s) which requested the monitoring service. Conversely, if this host crashes and re-starts, when the rpc.statd re-starts, it will notify all of the hosts which were being monitored at the time of the crash. The following option is available: -d Cause 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. -h bindip Specify specific IP addresses to bind to. This option may be specified multiple times. If no -h option is specified, rpc.statd will bind to INADDR_ANY. Note that when specifying IP addresses with -h, rpc.statd 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. The rpc.statd 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 run from rc(8) after the network has been started. 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(8), 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 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 re-try 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
November 1, 2007 BSD
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RPC.STATD(8) BSD System Manager's Manual RPC.STATD(8) NAME
rpc.statd -- host status monitoring daemon SYNOPSIS
rpc.statd [-d] rpc.statd [-d] -n rpc.statd [-d] [-l | -L | -N hostname] DESCRIPTION
The rpc.statd utility is a daemon which cooperates 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 program(s) which requested the monitoring service. Conversely, if this host crashes and restarts, the statd.notify service will be started to notify all of the hosts which were being monitored at the time of the crash. The rpc.statd utility consists of two launchd(8)-controlled services. The statd.notify service is run whenever the system needs to notify remote hosts of a restart. The statd service is controlled by rpc.lockd(8) so that the rpc.statd daemon is running whenever rpc.lockd(8) is running. The following is a list of command line options that are available. Note that since rpc.statd is normally started by launchd(8), configura- tion of these options should be controlled using the equivalent settings in the NFS configuration file. See nfs.conf(5) for a list of tun- able parameters. -d Sets the logging level to the maximum. Note that finer grain control is available via the nfs.statd.verbose option in nfs.conf(5). Logging is performed via syslog(3) using the LOG_DAEMON facility. By default, only messages up to priority LOG_WARNING are logged. Setting the verbose level to one will add LOG_NOTICE messages which includes logging failed mount attempts. A verbose level of two will increase the log level to LOG_INFO which includes logging successful mount attempts. A log level of three or more will add LOG_DEBUG messages and cause increasing amounts of debug information to be logged. The debug information exposes lots of information about rpc.statd's inner workings which is typically only useful to developers. Note: the syslog(8) configuration may need to be adjusted in order to see the increased verbosity. The following command line option causes the daemon to run in the statd.notify notification service mode: -n Send SM_NOTIFY messages to notify any hosts of a restart. The remaining command line options may be useful for viewing or modifying the contents of the status file. They do not start up any daemon or service. -l List each host (and its status) in the status file. -L List each host (and its status) in the status file and then continue to watch the file and report changes. -N Clear the "needs notification" status for hostname so the statd.notify service will no longer try to notify it. FILES
/var/db/statd.status non-volatile record of monitored hosts. /var/run/statd.pid The pid of the current statd daemon. /var/run/statd.notify.pid The pid of the current statd.notify daemon. /System/Library/LaunchDaemons/com.apple.statd.notify.plist The statd.notify service's property list file for launchd(8). /usr/include/rpcsvc/sm_inter.x RPC protocol specification used by local applications to register monitoring requests. SEE ALSO
nfs.conf(5), rpc.lockd(8), syslog(3), launchd(8) BUGS
There is no means for the daemon to tell when a monitored host has disappeared permanently (eg. catastrophic hardware failure), as opposed to transient failure of the host or an intermediate router. At present, it will pause and re-try notification at frequent intervals for 10 min- utes, then hourly, and finally gives up after 24 hours. The -N option may be used to remove the "needs notification" status from such hosts. 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. 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 BSD
July 5, 2008 BSD