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Initial Setup - Cron
Cron is a job scheduler program on Unix, that basically runs a program or script on a routine basis. Some shared hosting vendors do not allow cron access for security reasons (GoDaddy shared hosting). All that occurs is based on the frequency you determine the maintenance script is run on your server. The suggested frequency for Drupal is once a day. However if you are hosting up-to-the-minute news updates from other sites(news aggregation discussed in the next volume) you will want to increase the frequency to hourly or more often in a day.
To set this properly add this command to the cron job scheduler -
fetch -o output -q http://www.yourdomainname.com/cron.php
or
wget -O - -q http://www.yourdomainname.com/cron.php
The frequency of the job is determined by the schedule you set. Most unix cron schedulers accept 5 parameters to determine the schedule
* * * * * command to be executed |
| min | hour | day/month | month | day/week | Execution time |
| 30 | 0 | 1 | 1,6,12 | * | 00:30 Hrs on 1st of Jan, June &Dec. |
: | |||||
| 0 | 20 | * | 10 | 1-5 | 8.00 PM every weekday (Mon-Fri)only in Oct. |
: | |||||
| 0 | 0 | 1,10,15 | * | * | Midnight on 1st ,10th & 15th of month |
: | |||||
| 0 | 30 | * | * | * | Recommended minimum schedule -This job will run at 00:30 Hrs every day of the month |
| : | |||||
You can find the cron job scheduler from with your control panel of your web host. If you shared web host does not provide a cron scheduler you can use a remote cron scheduling service as a work around.
Resources
Video
In this video you will see how to setup cron for your Drupal installation
