"b" command in a crontab

Hi Mic,

 

 

Can you try the following:

 

 

Create a script file. Edit the actual command you want to run inside the double quotes

 

echo "b profile command here" > /root/ramcache.clear.sh

 

 

Make the script executable by root

 

chmod 744 /root/ramcache.clear.sh

 

 

Edit root's crontab

 

crontab -e

 

 

Add the following two lines (from: http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/)

 

 

At 9:10 and 11:10, run the ramcache clear script on the active unit

 

10 9,11 * * * if [ `/bin/ps1` == "Active" ]; then /root/ramcache.clear.sh > /dev/null 2>&1; fi

 

 

Aaron

Thank you Aaron for your quick answer.

 

I set it up.

 

How can i check the .sh is running correctly? do we have logs ?

 

 

Mic

 

You could add logging to the script to see what it's doing. Replace the existing script with this named /root/ramcache.clear.bash

 Save the output file name as the script name 
OUT=/var/log/`basename $0`.out

 Print the date and script name
echo "`date +%Y%m%d_%H%M%S`: `basename $0`: starting" >> $OUT

 List the current RAM cache entries for one HTTP profile
echo "Entries before delete:" >> $OUT
b profile http MY_HTTP_PROFILE ramcache entry show >> $OUT

 Delete current RAM cache entries for one HTTP profile
b profile http MY_HTTP_PROFILE ramcache entry all delete

 List the current RAM cache entries for one HTTP profile
echo "Entries after delete:" >> $OUT
b profile http MY_HTTP_PROFILE ramcache entry show >> $OUT

And then remove the existing crontab entry and add this:

At 9:10 and 11:10, run the ramcache clear script on the active unit

10 9,11 * * * if [ `/bin/ps1` == "Active" ]; then /root/ramcache.clear.bash > /var/log/ramcache.clear.bash.out 2>&1; fi

The output will be logged to /var/log/ramcache.clear.bash.

Aaron

Hi Mic,

 

 

Which version of LTM are you running? What bigpipe command are you running to list/clear the cache? If you run them from the command line without the script or cronjob involved do they work? If so, what happens if you run the script directly (/root/ramcache.clear.bash)? Do you see /var/log/ramcache.clear.bash.out being created?

 

 

Thanks, Aaron

when i run the script directly i have:

 

~ /root/ramcache.clear.bash

 

-bash: /root/ramcache.clear.bash: Permission denied

 

 

It' LTM V10.1

 

i type this command to list the cache:

 

b profile http TEST ramcache entry all

 

 

no ramcache.clear.bash.out created

 

 

Mic

Can you make the script executable by root:

 

 

chmod 744 /root/ramcache.clear.bash

 

 

And then rerun it?

 

 

Aaron

ok the script runs correctly when i start it manually

 

 

but witt seems not working with crontab (this is what i have in my crontab):

 

 

cron tab for root

 

1-59/30 * * * * /usr/bin/diskmonitor

 

05 9,11,13,14,15,17,19,00,01 * * * if [ `/bin/ps1` == "Active" ]; then /root/ramcache.clear.bash > /var/log/ramcache.clear.out 2>&1; fi

 

 

 

Is this correct?

 

 

Mic

 

for information i don't see a /bin/ps1 in my big-ip but only a /bin/ps

 

 

Mic

Great it works with crontab

 

 

Can i leave it this way ?

 

 

Mic

Good to hear. Yeah, that should be a safe way to check for the failover status in any LTM version.

 

 

You could comment out the debug logging in the bash script once you're done testing.

 

 

Aaron