How to setup external monitor with extended ping?

Hi Shirley,

 

 

Here's an example which work for me. You can save the code below as /usr/bin/monitors/custom_ping.bash, make it executable (chmod 744 /usr/bin/monitors/custom_ping.bash) and then define an external monitor like this:

 

 

If you add a DEBUG variable in the monitor definition and set it to 1, the script will write out debug to /var/log/ltm.

 

 

Aaron

 

 

Monitor definition

 

 

 b monitor custom_ping_monitor list
monitor custom_ping_monitor {
   defaults from external
   DEBUG "0"
   run "custom_ping.bash"
}

 

 

Monitor script

 

 

!/bin/bash
 Save as /usr/bin/monitors/custom_ping.bash
 Make executable using chmod 744 custom_ping.bash
 Use a custom IP address to source a ping to the pool member IP address
 Get the self IP address starting with 10.41.1. from the bigip_base.conf
 Log debug to local0.debug (/var/log/ltm)?
 Check if a variable named DEBUG exists from the monitor definition
 This can be set using a monitor variable DEBUG=0 or 1
if [ -n "$DEBUG" ]
then
   if [ $DEBUG -eq 1 ]; then echo "EAV `basename $0`: true: \$DEBUG: $DEBUG" | logger -p local0.debug; fi
else
    If the monitor config didn't specify debug, enable/disable it here
   DEBUG=0
   echo "EAV `basename $0`: false: \$DEBUG: $DEBUG" | logger -p local0.debug
fi
 Remove IPv6/IPv4 compatibility prefix (LTM passes addresses in IPv6 format)
IP=`echo $1 | sed 's/::ffff://'`
 We don't use the port except for logging
PORT=$2
 Check if there is a prior instance of the monitor running
pidfile="/var/run/`basename $0`.$IP.$PORT.pid"
if [ -f $pidfile ]
then
   kill -9 `cat $pidfile` > /dev/null 2>&1
   echo "EAV `basename $0`: exceeded monitor interval, needed to kill ${IP}:${PORT} with PID `cat $pidfile`" | logger -p local0.error
fi
 Add the current PID to the pidfile
echo "$$" > $pidfile
 Send the ping request and look for rtt in response
 Redirect stderr and stdout to nothing to ensure we don't errantly mark the pool member up
ping -I `awk 'BEGIN {RS="}\n";FS=RS} /^self 10\.41\.1\./ {print $1;}' /config/bigip_base.conf |head -1|awk '{print $2}'` -c 1 -W 1 $IP | grep rtt 2>&1 > /dev/null
 Debug
if [ $DEBUG -eq 1 ]
then
   echo "EAV `basename $0`: Running for ${IP}:${PORT} using source IP `awk 'BEGIN {RS="}\n";FS=RS} /^self 10\.41\.1\./ {print $1;} ' /config/bigip_base.conf |head -1|awk '{print $2}'`" | logger -p local0.debug
fi
 Check if the command ran successfully
 Note that any standard output will result in the script execution being stopped
 So do any cleanup before echoing to STDOUT
if [ $? -eq 0 ]
then
   rm -f $pidfile
   if [ $DEBUG -eq 1 ]; then echo "EAV `basename $0`: Succeeded for ${IP}:${PORT}" | logger -p local0.debug; fi
   echo "UP"
else
   rm -f $pidfile
   if [ $DEBUG -eq 1 ]; then echo "EAV `basename $0`: failed for ${IP}:${PORT}" | logger -p local0.debug; fi
fi