Boom at 22:53, 16 November 2016

2016-11-16T22:53:55Z

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Boom at 22:19, 16 November 2016

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	[[Category:Getting Started]]		[[Category:Getting Started]]
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Boom at 22:16, 16 November 2016

2016-11-16T22:16:47Z

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			{{:Cloud Hosting}}

Boom: Created page with "Cron enables users to schedule jobs (commands or shell scripts) to run automatically at a certain time or date. It is commonly used to automate system maintenance or administr..."

2016-11-11T00:19:21Z

Created page with "Cron enables users to schedule jobs (commands or shell scripts) to run automatically at a certain time or date. It is commonly used to automate system maintenance or administr..."

New page

Cron enables users to schedule jobs (commands or shell scripts) to run automatically at a certain time or date. It is commonly used to automate system maintenance or administration. Some CMS like Drupal use cron to automate some tasks.

To edit what jobs are scheduled, first SSH to your container, then run:
<pre>
crontab -e
</pre>

This should open up an empty crontab if this is your first time using Cron.

Cron uses the following syntax to schedule jobs.
<pre>
5 * * * * /user/bin/php5 /path/to/script >/dev/null 2>&1

minute hour day month day-of-week command-line-to-execute
</pre>

Some examples of proper scheduling syntax:
<pre>
*/5 * * * * : Run cron every 5 minutes
* */1 * * * : Run cron every hour
* * */3 * * : Run cron every 3 days
* * * */1 * : Run cron once every month
*/5 * */3 * * : Run cron every 5 minutes, all day, every 3rd day.
30 0 * * * : Run cron at 12:30 every day
</pre>

An example of a cron job which will remove all the contents of a cache directory every 3 days:
<pre>
* * */3 * * rm -rf /var/www/vhosts/domain.com/http_docs/cache/*
</pre>

If you want to see the output, you can have it email to you:
<pre>
*/5 * * * * /usr/bin/php5 /path/to/script 2>&1 | Mail -E -s "Email Subject here" address@domain.com
</pre>

You can also redirect the output to a log file:
<pre>
*/5 * * * * /usr/bin/php5 /path/to/script >> /home/users/u/username/cronlog.log 2>&1
</pre>
* Adding '''>>''' will continue to append the log. If you just want to see the output once just add '''>''' instead of '''>>'''

To list all cronjobs in your crontab:
<pre>
crontab -l
</pre>

<br><br>

Cloud Hosting/Cron - Revision history

Boom at 22:53, 16 November 2016

Boom at 22:19, 16 November 2016

Boom at 22:16, 16 November 2016

Boom: Created page with "Cron enables users to schedule jobs (commands or shell scripts) to run automatically at a certain time or date. It is commonly used to automate system maintenance or administr..."