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Shell Programming and Scripting

Monitor some of network services

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# 1  
Old 11-08-2016
Monitor some of network services
Hi

I want to write a script for netflow service
because my service doesnt send any packet to netflow walker (server).
Although the service is started but it does not send any packet to server until i restart the service
I want to write a script in order to restart the service when no packets have been sent to the server.
# 2  
Old 11-08-2016
What operating system are you using?

What shell are you using?

Can you manually restart the service? If so, what command(s) do you use to restart the service? What do you want the script to do that can't be done by putting the command(s) you use to restart the service in a file and executing that file?
# 3  
Old 11-09-2016
my operating system is Fedora linux and interpreter is bash
yes of course i manually restart the service when it does not send packet.
i want to write a script that detect this service does not send packet and then restart automatically.
# 4  
Old 11-09-2016
I repeat:
Quote:
...what command(s) do you use to restart the service? What do you want the script to do that can't be done by putting the command(s) you use to restart the service in a file and executing that file?
And, how do you determine that "the service" does not send a packet?
# 5  
Old 11-09-2016
by tcpdump ,
tcpdump is a tool for capture network traffic packet . i run this command on my system
for example :
tcpdump -i eth0 -p udp and port 9996 -nn

and then i see no any packet send to the server on this port and so restart the service and then every thing is going to OK Smilie Smilie
# 6  
Old 11-15-2016
it Solved
I write this script and it does work

Code:
#!/bin/bash
while  true
do

tcpdump -i ETH1  port 9996  >  /home/log_netflow &
pid=$!
sleep 5
kill $pid
count=`cat /home/log_netflow | wc -l `
echo $count

if  [ $count  -gt 2 ] ;  then

echo " system is working "   >>  /home/service_status

else

echo "system is down "   >>  /home/service_status
/etc/init.d/netflowd  restart
fi

done



Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!
Last edited by RudiC; 11-15-2016 at 07:33 AM.. Reason: Changed [B] to CODE tags.
# 7  
Old 11-15-2016
Looks good!
Only one little efficiency tip
Code:
count=`wc -l < /home/log_netflow`
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