Create a script to monitor host interface up down Post: 302543094

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Top Forums Shell Programming and Scripting Create a script to monitor host interface up down Post 302543094 by DGPickett on Friday 29th of July 2011 12:28:04 PM

07-29-2011

Registered User

The best proof is to keep a connection up and send data round trip, intermittently. For instance, you can ssh and sed timestamps once a minute, ensuring they are returned in 1 second. If they block or you cannot connect, it emails and exits:

Code:

#!/usr/bin/ksh
 
export LOG=/tmp/ssh.other_host.$$ FAIL_CT=/tmp/ssh.other_host.$$.ct
 
echo 0 >$FAIL_CT
 
while [ $(<$FAIL_CT) != 4 ]
do
 while [ $(<$FAIL_CT) != 4 ]
 do
  last=$( date )
  echo "
$last
" &                   # background in case pipe blocks
  sleep 1
  if ( fgrep -q "$last" $LOG )
  then
   echo 0 >$FAIL_CT
   sleep 60
   continue
  fi
  echo $(( $(<$FAIL_CT) + 1 ))>$FAIL_CT
 done | ssh other_host "cat -u"
done >$LOG 2>&1
 
(
 date "+%Y-%m-%d_%H:%M:%S ${0##*/} ($$) Unreachable: other_host
============================================"
 tail -25 $LOG
 ) | mailx -s "${0##*/} Unreachable: other_host" support_id@your_email_host

ssh sessions sometimes are timed out, so this reports if a session cannot be established or if the data flow gets blocked.

DGPickett

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LEARN ABOUT DEBIAN

torrus_monitor

TORRUS_MONITOR(8)						      torrus							 TORRUS_MONITOR(8)

NAME

       monitor - Torrus Monitor.

SYNOPSIS

       torrus monitor --tree=TREENAME [options...]

DESCRIPTION

       This command starts the Monitor process for the tree TREENAME. By default it forks into a daemon, sets the log output file to
       /var/log/torrus/monitor.TREENAME.log, performs one monitoring cycle, and sleeps until the next cycle is scheduled. In daemon mode the log
       file can be reopened by sending it a SIGHUP signal.

OPTIONS

       --nodaemon
	   Prevents the process from becoming a daemon and sets the log to STDERR.

       --runonce
	   Instructs the script to run once and exit. Implies --nodaemon.

       --delay=N
	   Makes the daemon sleep for N minutes before starting the first cycle.  This would happen on the daemon startup and also after each
	   configuration recompilation.  For example, when monitor and collector start simultaneously, the collector needs some time to retrieve
	   the data being monitored.

       --debug
	   Sets the log level to debug.

       --verbose
	   Sets the debug level to info.

       --help
	   Displays a help message.

FILES

       /etc/torrus/conf/torrus-siteconfig.pl
	   Torrus site configuration script.

       /var/log/torrus/monitor.TREENAME.log
	   Monitor's log for the tree TREENAME.

SEE ALSO

       torrus(8)

NOTES

       See more documentation at Torrus home page: http://torrus.org

AUTHOR

       Stanislav Sinyagin <ssinyagin@yahoo.com>

torrus 2.03							    2013-07-26							 TORRUS_MONITOR(8)