Need to monitor pool members to see if they are out of the farm

There's really several ways to do this:

1. user_alert.conf script and/or iCall to capture, in real time, when nodes go up and down. From there you run a script that sends an alert, syslog message, email, SNMP trap, whatever, per event.

2. Run a script that periodically checks all of the pool members for their state (up or down) and session (monitor-enabled or user-disabled). The following is a shell of what that could look like:

   !/bin/bash
   
    define pool name
   pool="local-pool";
   
   arr=($(tmsh list ltm pool local-pool |perl -ne 'if (m/([a-zA-Z0-9\.-]+:[^\s]+)\s{/) { print "$1\n"}'));
   
   for x in "${arr[@]}"
   do
       state=`tmsh list ltm pool $pool members { $x { state } } |grep state |awk -F" " '{ print $2 }'`
       session=`tmsh list ltm pool $pool members { $x { session } } |grep session |awk -F" " '{ print $2 }'`
       echo "$x:"
       echo "   state: $state"
       echo "   session: $session"
   done