Magento – How are dynamic cronjobs inserted into cron_schedule

cronschedule

The timing for a number of Magento's core cron tasks such as sitemap, stock alert notifications and log cleaning can be adjusted via the admin's System Config. This means they are not defined inside the cronjob node of a module's config.xml however they do get written into the cron_schedule table like other jobs.

How does the cron scheduler find those jobs? My guess is that there is an event thrown during the schedule generation, but I can't see any instances of dispatchEvent within Mage_Cron.

Best Answer

These kind of cronjobs have a backend model that is called when the cron settings are called. This model inserts the cron job run time in core_config_data and the cron schedule reads it from there.
Let's take as example the sitemap cron. The field 'frequency' has this backend model (see app/code/code/Mage/Sitemap/etc/system.xml):

<backend_model>adminhtml/system_config_backend_sitemap_cron</backend_model>

When the frequency is saved (and the rest of the fields with it) this method is called: Mage_Adminhtml_Model_System_Config_Backend_Sitemap_Cron::_afterSave().
This inserts in the table core_config_data the cron expression with this path crontab/jobs/sitemap_generate/schedule/cron_expr.
This value is read in Mage_Cron_Model_Observer::_generateJobs and added to the cron_schedule

Related Solutions

Magento – Cronjobs Magento 1.9.2.2 – Is it possible to have Cron.sh call Cron.php by /usr/php/54/usr/bin/php

Just edit your cron.sh file

Find:

PHP_BIN=`which php`

And replace with:

PHP_BIN='/usr/php/56/bin/php'

(I'm using php 5.6)

I have tested and it worked for me. I'm using hostmonster.com service, default is PHP 5.2 and I have switched to PHP 5.6 in CPANEL.

The path to your PHP 5.6 executable might be different on another hoster, ask their support if you don't find it.

Magento – Magento cron jobs are not scheduling in the cron_schedule table

First of all, make sure the cron is set on your server. Try the following command using SSH

#crontab -l

There should be your magento_root/cron.php file.

If not, then you need to edit the crontab. Use the following commands

#crontab -e       
(this will open crontab in your default editor)

*/5 * * * * wget -O  /dev/null -q path_to_magento_root/cron.php > /dev/null
(add this statement and save and close the file. 
This will check your magento cron.php after every five minutes)

Now, magento cron is set on your server.

I'd also recommend you this extension AOE_SCHEDULLER. This will help you monitoring all magento crons.

Best Answer

Related Solutions

Magento – Cronjobs Magento 1.9.2.2 – Is it possible to have Cron.sh call Cron.php by /usr/php/54/usr/bin/php

Magento – Magento cron jobs are not scheduling in the cron_schedule table

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