nixCraft

Hi.

I need a script which could start squid automatically if it stops.
I've added squid into rc.local but sometimes when i start my machine it does not start automatically, can anyone help to write a script which could check if squid has started then it would not start again and if squid has not been started then it would start automatically..

Regards
Asim

If you want to script this yourself you could check the PID file Squid uses when it runs, check if it exists and if it does cat it and save the PID to a variable. Then notice the full commandline Squid runs as, use that in pgrep -f 'commandline' and save the PID( to an array. Check if the array is empty ("${#array[@]}"), else compare PIDs. If empty or PIDs not matching up, stop Squid gracefully, remove the PID file then start Squid.
OTOH running a dedicated process watcher like Monit is easy to configure and expand, faster in checking and more versatile as it can start, restart about any service and alert you all in one go and all of the time.

Dear Thanks for your reply.
I'm not expert in shell scripting, can you please guide me how can i define all this in a script?

Regards
ASim

Sure. Just make a start, post it here and I'll try and correct it.

Dear would you please write a simple script in the form of that you've above described so that it would be easy for me to proceed next and then i could be able to provide all the things those are required to make this script. Kindly help me.

Regards
Asim

echo '*/1 * * * * /somePath/pgrep -f '/somePath/squid' >/dev/null 2>&1 || /somePath/squid' >> /etc/crontab

Just my suggestion, I think you dont need a script to run the service on startup.you can use this instead "chkconfig --level 35 squid on"

It depends on your runlevel you used.