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Full Discussion: Command to run across servers
Top Forums UNIX for Advanced & Expert Users Command to run across servers Post 302487502 by DGPickett on Thursday 13th of January 2011 01:55:17 PM
Old 01-13-2011
The ssh compression option is appropriate if the reports get long. It improves the security, too.

---------- Post updated 2011-01-13 at 01:55 PM ---------- Previous update was 2011-01-12 at 04:29 PM ----------

Quote:
Originally Posted by DGPickett
If you do not want nfs or remote scripts, you can ship the scripting from a central script:
Code:
 
while read host
do
 ( echo ". ./.profile
    -- all commands you want to run --
     " | ssh2 $host ksh >>log_dir/$host.$(date '+%Y''%m''%d-%H%M').log 2>&1
    if [ $? != 0 ]
    then
      echo "$host Down!"
    fi )&
done <host_list_file 2>&1 | cat -u

I prefer echo '...'"..."'...' | over <<!, keeping stuff flowing left to right, with switch to "..." where I want local interpretation, like $var, `` or $(), not piles of \escapes. Everything inside '...' is pretty stable and low cost for the shell to produce, so start there, go to "..." as necessary, and your life will have fewer unpleasant surprises.
Modified for parallel operarion. Logs were already separate for child reports. The "| cat" holds on until every subshell exits.
 

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LEARN ABOUT OSF1

bprelay

bprelay(8)						      System Manager's Manual							bprelay(8)

NAME

       bprelay - BOOTP relay agent

SYNOPSIS

       /usr/sbin/bprelay [-f] [-d n] [-h hopcount] [-i interface,interface...] [-t minutes] [-w seconds] server...

OPTIONS

       Foreground  mode.   In  this  mode, bprelay does not run as a daemon.  All messages are written to stdout and stderr, although warnings and
       errors are still sent to syslog(3).  Without this option, bprelay listens on all interfaces  on	which  the  underlying	protocol  supports
       broadcasting.   With  this  option,  bprelay  listens  only  to those interfaces specified.  Any non-existent or invalid interface name are
       ignored.  Sets debug level to the numeric value n.  Larger values of n provides more debugging information.  Instructs bprelay to not  for-
       ward  packets  if  the value of the hops field in the BOOTP packet exceeds hopcount.  Instructs bprelay to terminate if minutes have passed
       without any packets being received.  This option is only honored if bprelay was started from inetd(8).  Instructs bprelay  to  not  forward
       packets until the secs field in the BOOTP packet header exceeds this value.

DESCRIPTION

       The  bprelay daemon forwards DHCP or BOOTP packets to the specified list of servers (server).  Servers may be identified either by their IP
       addresses or by their names.  The bprelay agent normally runs as a daemon process, and may be started either from the  shell  command  line
       interface or by inetd(8).

       The purpose of bprelay is to provide the same service as that found in router hardware, but to run on UNIX workstations.  The bprelay agent
       listens for DHCP/BOOTP packets on each of the interfaces specified in the command line, and relays each packet to  the  servers	specified.
       As  a  rule,  bprelay forwards each and every packet to every server specified, but it omits servers whose IP address is found to be on the
       same IP network as the receiving interface since those servers will presumably hear the original broadcast.

RESTRICTIONS

       Non-standard subnet masks for all networks administered by bprelay, must be available either through /etc/netmasks or NIS.

SEE ALSO

       Commands: inetd(8), joinc(8)

       System calls: syslog(3)

       RFC1497, RFC1542, RFC1534

																	bprelay(8)
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