RPC.STATD(8) | System Manager's Manual | RPC.STATD(8) |
rpc.statd
— host
status monitoring daemon
rpc.statd |
[-d ] |
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 program(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
-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.
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
A version of rpc.statd
appeared in SunOS
4.
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 relationship. This is convenient for the NFS locking protocol, but probably reduces the usefulness of the monitoring system for other applications.
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.
September 19, 1995 | NetBSD 10.99 |