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statd - Unix, Linux Command
NAME
rpc.statd - NSM status monitor
SYNOPSIS
/sbin/rpc.statd [-F] [-d] [-?] [-n name ] [-o port ] [-p port ] [-H prog ] [-V] DESCRIPTION
The
rpc.statd server implements the NSM (Network Status Monitor) RPC protocol.
This service is somewhat misnamed, since it doesnt actually provide
active monitoring as one might suspect; instead, NSM implements a
reboot notification service. It is used by the NFS file locking service,
rpc.lockd, to implement lock recovery when the NFS server machine crashes and
reboots.
Operation
For each NFS client or server machine to be monitored,
rpc.statd creates a file in
/var/lib/nfs/statd/sm. When starting, it iterates through these files and notifies the
peer
rpc.statd on those machines.
OPTIONS
Tag | Description |
-F |
By default,
rpc.statd forks and puts itself in the background when started. The
-F argument tells it to remain in the foreground. This option is
mainly for debugging purposes.
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-d |
By default,
rpc.statd sends logging messages via
syslog(3)
to system log. The
-d argument forces it to log verbose output to
stderr instead. This option is mainly for debugging purposes, and may only
be used in conjunction with the
-F parameter.
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-n, --name name | |
specify a name for
rpc.statd to use as the local hostname. By default,
rpc.statd will call
gethostname(2)
to get the local hostname. Specifying
a local hostname may be useful for machines with more than one
interfaces.
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-o, --outgoing-port port | |
specify a port for
rpc.statd to send outgoing status requests from. By default,
rpc.statd will ask
portmap(8)
to assign it a port number. As of this writing, there is not
a standard port number that
portmap always or usually assigns. Specifying
a port may be useful when implementing a firewall.
|
-p, --port port | |
specify a port for
rpc.statd to listen on. By default,
rpc.statd will ask
portmap(8)
to assign it a port number. As of this writing, there is not
a standard port number that
portmap always or usually assigns. Specifying
a port may be useful when implementing a firewall.
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-P, --state-directory-path directory | |
specify a directory in which to place statd state information.
If this option is not specified the default of
/var/lib/nfs is used.
|
-N |
Causes statd to run in the notify-only mode. When started in this mode, the
statd program will check its state directory, send notifications to any
monitored nodes, and exit once the notifications have been sent. This mode is
used to enable Highly Available NFS implementations (i.e. HA-NFS).
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-H, --ha-callout prog | |
Specify a high availability callout program, which will receive callouts
for all client monitor and unmonitor requests. This allows
rpc.statd to be used in a High Availability NFS (HA-NFS) environment. The
program will be run with 3 arguments: The first is either
add-client or
del-client depending on the reason for the callout.
The second will be the name of the client.
The third will be the name of the server as known to the client.
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-? |
Causes
rpc.statd to print out command-line help and exit.
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-V |
Causes
rpc.statd to print out version information and exit.
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TCP_WRAPPERS SUPPORT
This
rpc.statd version is protected by the
tcp_wrapper library. You have to give the clients access to
rpc.statd if they should be allowed to use it. To allow connects from clients of
the .bar.com domain you could use the following line in /etc/hosts.allow:
statd: .bar.com
You have to use the daemon name
statd for the daemon name (even if the binary has a different name).
For further information please have a look at the
tcpd(8)
and
hosts_access(5)
manual pages.
SIGNALS
SIGUSR1 causes
rpc.statd to re-read the notify list from disk
and send notifications to clients. This can be used in High Availability NFS
(HA-NFS) environments to notify clients to reacquire file locks upon takeover
of an NFS export from another server.
FILES
/var/lib/nfs/statd/sm/state
/var/lib/nfs/statd/sm/*
/var/lib/nfs/statd/sm.bak/* SEE ALSO
Jeff Uphoff <juphoff@users.sourceforge.net>
Olaf Kirch <okir@monad.swb.de>
H.J. Lu <hjl@gnu.org>
Lon Hohberger <hohberger@missioncriticallinux.com>
Paul Clements <paul.clements@steeleye.com>
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