3 .\" Copyright (c) 1995 A.R.Gordon, andrew.gordon@net-tel.co.uk
4 .\" All rights reserved.
6 .\" Redistribution and use in source and binary forms, with or without
7 .\" modification, are permitted provided that the following conditions
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13 .\" documentation and/or other materials provided with the distribution.
14 .\" 3. All advertising materials mentioning features or use of this software
15 .\" must display the following acknowledgement:
16 .\" This product includes software developed by the University of
17 .\" California, Berkeley and its contributors.
18 .\" 4. Neither the name of the University nor the names of its contributors
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22 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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34 .\" $FreeBSD: src/usr.sbin/rpc.statd/rpc.statd.8,v 1.7.2.4 2003/03/11 22:31:32 trhodes Exp $
35 .\" $DragonFly: src/usr.sbin/rpc.statd/rpc.statd.8,v 1.3 2006/02/17 19:40:24 swildner Exp $
37 .Dd September 19, 1995
42 .Nd host status monitoring daemon
50 is a daemon which co-operates with
52 daemons on other hosts to provide
53 a status monitoring service. The daemon accepts requests from
54 programs running on the local host (typically,
56 the NFS file locking daemon) to monitor the status of specified
57 hosts. If a monitored host crashes and restarts, the remote daemon will
58 notify the local daemon, which in turn will notify the local program(s)
59 which requested the monitoring service. Conversely, if this host crashes
60 and re-starts, when the
62 re-starts, it will notify all of the hosts which were being monitored
63 at the time of the crash.
65 The following option is available:
66 .Bl -tag -width indent
68 Cause debugging information to be written to syslog, recording
69 all RPC transactions to the daemon. These messages are logged with level
70 LOG_DEBUG and facility LOG_DAEMON. Error conditions are logged irrespective
71 of this option, using level LOG_ERR.
76 utility must NOT be invoked by
78 because the protocol assumes that the daemon will run from system start time.
79 Instead, it should be run from
81 after the network has been started.
83 .Bl -tag -width /usr/include/rpcsvc/sm_inter.x -compact
84 .It Pa /var/db/statd.status
85 non-volatile record of currently monitored hosts.
86 .It Pa /usr/include/rpcsvc/sm_inter.x
87 RPC protocol specification used by local applications to register monitoring requests.
94 The implementation is based on the specification in X/Open CAE Specification
95 C218, "Protocols for X/Open PC Interworking: XNFS, Issue 4", ISBN 1 872630 66 9
97 There is no means for the daemon to tell when a monitored host has
98 disappeared permanently (eg. catastrophic hardware failure), as opposed
99 to transient failure of the host or an intermediate router. At present,
100 it will re-try notification attempts at frequent intervals for 10 minutes,
101 then hourly, and finally gives up after 24 hours.
103 The protocol requires that symmetric monitor requests are made to both
104 the local and remote daemon in order to establish a monitored relationship.
105 This is convenient for the NFS locking protocol, but probably reduces the
106 usefulness of the monitoring system for other applications.
108 The current implementation uses more than 1Kbyte per monitored host in
109 the status file (and also in VM). This may be inefficient for NFS servers
110 with large numbers of clients.