EMC Legato NetWorker Commands Reference

nsrexecd

SYNOPSIS

       nsrexecd  [  -s  server  [  -s  server  ...   ]] [ -f serverfile ] [ -p
       savepath ] [ -i ]

DESCRIPTION

       nsrexecd is used by NetWorker servers to perform  automatic  operations
       on  NetWorker  clients.   It  is  currently used by savegrp(1) to start
       saves, pre-migrations and storage node functions  on  NetWorker  client
       machines.   When  migration  is enabled on a NetWorker client, nsrexecd
       monitors disk usage, starts migration runs using  nsrmig(1),  and  also
       manages file recall using nsrib(1).  When storage node functions are in
       use, nsrexecd starts nsrmmd(1) daemons and  nsrjb(1)  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  them-
       selves, 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(1) or savefs(1)), migration  requests  (for
       example,  nsrpmig(1)  or  nsrmig(1)),  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(1)  or nsrpmig(1)).  It then executes the specified com-
       mand from the NetWorker binary directory.  This directory  is  normally
       determined by the location of the nsrexecd executable, but can be spec-
       ified 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

       -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.

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

       nsr_la(5), nsr_storage_node(5), nsrib(1), nsrmig(1), nsrpmig(1), 
       nsrports(1), save(1), save(1), savefs(1), savegrp(1)

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