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rpc.statd (8)
rpc.statd (8) ( FreeBSD man: Команды системного администрирования )
>> rpc.statd (8) ( Linux man: Команды системного администрирования )
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 doesn't 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
-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.
-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.
-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.
-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.
-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).
-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.
-?
Causes
rpc.statd
to print out command-line help and exit.
-V
Causes
rpc.statd
to print out version information and exit.
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.
