117 lines
4.4 KiB
Groff
117 lines
4.4 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1995 A.R.Gordon, andrew.gordon@net-tel.co.uk
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 19, 1995
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.Dt RPC.STATD 8
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.Os
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.Sh NAME
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.Nm rpc.statd
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.Nd host status monitoring daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl d
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.Sh DESCRIPTION
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The
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.Nm
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utility
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is a daemon which co-operates with
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.Nm
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daemons on other hosts to provide
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a status monitoring service.
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The daemon accepts requests from
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programs running on the local host (typically,
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.Xr rpc.lockd 8 ,
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the NFS file locking daemon) to monitor the status of specified
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hosts.
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If a monitored host crashes and restarts, the remote daemon will
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notify the local daemon, which in turn will notify the local program(s)
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which requested the monitoring service.
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Conversely, if this host crashes
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and re-starts, when the
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.Nm
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re-starts, it will notify all of the hosts which were being monitored
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at the time of the crash.
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.Pp
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The following option is available:
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.Bl -tag -width indent
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.It Fl d
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Cause debugging information to be written to syslog, recording
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all RPC transactions to the daemon.
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These messages are logged with level
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LOG_DEBUG and facility LOG_DAEMON.
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Error conditions are logged irrespective
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of this option, using level LOG_ERR.
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.El
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.Pp
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The
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.Nm
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utility must NOT be invoked by
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.Xr inetd 8
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because the protocol assumes that the daemon will run from system start time.
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Instead, it should be run from
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.Xr rc 8
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after the network has been started.
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.Sh FILES
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.Bl -tag -width /usr/include/rpcsvc/sm_inter.x -compact
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.It Pa /var/db/statd.status
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non-volatile record of currently monitored hosts.
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.It Pa /usr/include/rpcsvc/sm_inter.x
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RPC protocol specification used by local applications to register monitoring requests.
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.El
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.Sh SEE ALSO
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.Xr syslog 3 ,
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.Xr rc 8 ,
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.Xr rpc.lockd 8
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.Sh STANDARDS
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The implementation is based on the specification in X/Open CAE Specification
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C218, "Protocols for X/Open PC Interworking: XNFS, Issue 4", ISBN 1 872630 66 9
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.Sh BUGS
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There is no means for the daemon to tell when a monitored host has
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disappeared permanently (e.g.\& catastrophic hardware failure), as opposed
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to transient failure of the host or an intermediate router.
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At present,
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it will re-try notification attempts at frequent intervals for 10 minutes,
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then hourly, and finally gives up after 24 hours.
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.Pp
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The protocol requires that symmetric monitor requests are made to both
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the local and remote daemon in order to establish a monitored relationship.
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This is convenient for the NFS locking protocol, but probably reduces the
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usefulness of the monitoring system for other applications.
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.Pp
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The current implementation uses more than 1Kbyte per monitored host in
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the status file (and also in VM).
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This may be inefficient for NFS servers
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with large numbers of clients.
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