nsrexecd(8)
nsrexecd(8)
NAME
nsrexecd - NetWorker client execution service
SYNOPSIS
nsrexecd [ -s server [ -s server ... ]] [ -f serverfile ] [ -p
savepath ] [ -i ] [ -r ]
DESCRIPTION
nsrexecd is used by NetWorker servers to perform automatic operations
on NetWorker clients. It is currently used by savegrp(8) to start
saves and storage node functions on NetWorker client machines. When
storage node functions are in use, nsrexecd starts nsrmmd(8) daemons
and nsrjb(8) commands on the host, and responds to polling requests
from the server. See nsr_storage_node(5) for additional detail on
storage nodes. The nsrexecd service is normally started at boot time
on each NetWorker client machine. Since NetWorker servers are usually
expected to be clients of themselves, nsrexecd runs on all NetWorker
servers as well.
The nsrexecd service exports an RPC-based service to remotely execute
NetWorker operations. All requests must be authenticated, and can
optionally be restricted to specific NetWorker servers. Only save
requests (for example, save(8) or savefs(8)) and storage node requests
are allowed.
When command execution is requested, nsrexecd first verifies that the
request is authenticated, and that it comes from a valid NetWorker
server; the NetWorker server running on the localhost is always consid-
ered valid, independent from the options supplied to nsrexecd. Next,
nsrexecd verifies that the command is a save or migration command (for
example, save(8)). It then executes the specified command from the
NetWorker binary directory. This directory is normally determined by
the location of the nsrexecd executable, but can be specified on the
command line.
OPTIONS
-i As part of the NetWorker server authentication, the server's
network address is mapped to a name. The name is then reverse-
mapped to a network address. The server is authenticated if and
only if the original network address matches the reverse-mapped
address. The -i flag skips the address comparison thereby
allowing workarounds to misconfigured or misfeatured naming sys-
tems. This option should be used with care since it may allow
the NetWorker client to send its data to an unauthorized
machine.
-f serverfile
Specifies a file containing a list of NetWorker servers which
can initiate saves. This file should list one server name per
line. If no -f or -s options are specified, nsrexecd looks for
a default file in this same format (or Mac preferences on the
Mac client). The location of this default file is listed in the
FILES section of this man page.
-p savepath
Tells nsrexecd to look for save commands in the savepath direc-
tory, rather than the default (the directory in which nsrexecd
exists).
-s server
Allows save requests to be initiated only by the given NetWorker
server. Multiple -s options may be given to allow access by
several NetWorker servers. If a NetWorker server has multiple
network interfaces, it is often best to list the hostname corre-
sponding to each network interface, to avoid failed saves.
-r This option should be used with EMC PowerSnap module only. This
option, would start another instance of nsrexecd for PowerSnap
administration Purposes.
FILES
/nsr/res/nsrla.res The file with attributes describing the
NetWorker nsrexecd service and its
resources (see nsr_la(5)).
/nsr/res/servers The file containing the default list of
servers that can back up or migrate the
NetWorker client.
SEE ALSO
nsrla(5), nsr_storage_node(5), nsrports(8), save(8), savefs(8), savegrp(8)
NetWorker 7.6.2 Jul 14, 11 nsrexecd(8)