Broker monitor script with notification

[sjcrane]

I need some assistance writing a script to monitor a RPC broker and notify if it is down.

I have a broker that runs on port 9250. When it is up it looks like the following:

# netstat -Aan|grep 9250
f1000e00025863b8 tcp4 0 0 172.16.2.1.9250 172.16.80.40.1185 ESTABLISHED
f1000e000ecafbb8 tcp4 0 0 *.9250 *.* LISTEN
f1000e00003a5bb8 tcp4 0 0 172.16.2.1.9250 172.16.81.105.1572 ESTABLISHED
f1000e000027cbb8 tcp4 0 0 172.16.2.1.9250 10.4.62.89.1123 ESTABLISHED
f1000e00021e03b8 tcp4 0 0 172.16.2.1.9250 10.4.68.210.1356 ESTABLISHED
f1000e000224bbb8 tcp4 0 0 172.16.2.1.9250 10.4.65.79.2659 ESTABLISHED
f1000e000047bbb8 tcp4 0 0 172.16.2.1.9250 172.16.2.143.1098 ESTABLISHED
f1000e00022783b8 tcp4 0 0 172.16.2.1.9250 172.16.5.173.1037 ESTABLISHED



When it is down it looks like the following:

# netstat -Aan|grep 9250
#

I would like to run a script from CRON every 2 minutes that looks for the broker to be up but if not, notify me via email...

So:


If broker is up = do nothing
If broker is down = email notification

mail -s "Broker 9250 is down" <email address> < /tmp/restart_broker.txt

So it emails that it is down and provides instructions on how to restart.

Any help would be greatly appreciated...

 

[sjcrane]

FYI

AIX6.1 KSH

 

[blarneyme]

I'm tired and going to bed. But quickly:

if return code is 1 then email
if return code is 0 then do nothing

You will get a 1 if netstat returns nothing
You will get a 0 if netstat returns data

#!/bin/ksh

netstat -Aan|grep 6000 1>/dev/null
RC=$?
echo RCa $RC
if [[ ${RC} -eq 1 ]]
then
        echo "Mailing"
elif [[ ${RC} -eq 0 ]]
then
        echo exiting
fi

netstat -Aan|grep 9250 1>/dev/null
RC=$?
echo RCb $RC
if [[ ${RC} -eq 1 ]]
then
        echo "Mailing"
elif [[ ${RC} -eq 0 ]]
then
        echo exiting
fi

exit 0

which on my server will print:

$ ./x
RCa 0
exiting
RCb 1
Mailing

You will need to change the 'echo Mailing' to mail you, but you can do that. This was very quick and took 2 minutes. It can be fluffed up with more bells and whistles, but as I said, I'm going to bed.