Thanks Cameron
I ended up just adding a random sleep to the crons
<?php
sleep(rand(0,600));
?>
But I do like that idea of a wrapper script or a lock script.
=================================================
Steven Barre
steven@xxxxxxxxxxxxxxxxxxxxxxxx
Systems and Support Manager
Real Estate Webmasters
www.realestatewebmasters.com
==================================================
On 4/20/2010 18:34, Cameron Simpson wrote:
On 20Apr2010 09:34, Steven Barre<steven@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
| I know that you can get cron to do something "every x". For example
| to have something run every 15 min you would do
|
| */15 * * * * php /path/to/script.php
|
| But now I have a whole bunch of these set up and having them all run
| at exactly the same time is causing issues.
|
| Is there any way to stagger these? Like tell it to run every 15 min
| + 2 min so it runs at 02, 17, 32, and 47 minutes past the hour?
|
| Or is my best bet to simply put a sleep at the start of the script
| with a random time?
Leaving aside the other suggestions to simply write staggered times,
some other "automatic" approaches are available.
1: Put all the jobs in one shell script:
#!/bin/sh
php /path/to/script1.php
php /path/to/script2.php
... etc ...
and have in cron:
*/15 * * * * /path/to/the-above-wrapper-script
which will run them in sequence.
Of course that relies on the all having exactly the same timing.
2: Use a locking system:
*/15 * * * * with_lock "lock_name" php /path/to/script1.php
*/15 * * * * with_lock "lock_name" php /path/to/script2.php
which prevents any of them running at the same time. with_lock is a
script you must write, to obtain a lock of some kind, run the command, and
release the lock. That way when two jobs coincide, one will wait for the
other to complete before proceeding.
I use this script:
http://www.cskk.ezoshosting.com/cs//css/bin/lock
for this purpose.
--
redhat-list mailing list
unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/redhat-list
