We consider that this message sometimes given by scripts and applications for the implementation of cron tasks: 'contact your server administrator' is worthy of the 80s :). In fact, whether it's the cPanel administration panel or another, this kind of elementary function has been made accessible to the end users, this is now a 'just do it' task, just read the basic cPanel instructions and this article if necessary...
From your cPanel, section Advanced / Cron jobs :
Cron executing at too close intervals without need/justification leads to bugs, and overflow of resources leading to the malfunction of your website
According to your needs and recommendations of the editor, here are the 2 formats A and B in examples :
A. PHP scripts running in internal php :
/usr/bin/php -f /home/yourcpaneluser/public_html/yourfolder/your-sub-folder/yourfile.php >/dev/null 2>&1or
php -f /home/your_user/public_html/yourfolder/your-sub-folder/yourfile.php >/dev/null 2>&1
(The '-f' flag tells php to parse/execute the following file)
(Check : http://php.net/manual/en/features.commandline.options.php)
For cPanel servers :
/usr/local/bin/php -f /home/votreusercpanel/public_html/votredossier/votre-sous-dossier/votrefichier.php >/dev/null 2>&1
B. PHP scripts running externally :
wget -q -O /dev/null "http://www.yourdomain.com/yourfolder/your-sub-folder/yourfile.php" >/dev/null 2>&1
/usr/bin/wget -q -O /dev/null "http://www.yourdomain.com/yourfolder/your-sub-folder/yourfile.php" >/dev/null 2>&1
curl -s "http://www.yourdomain.com/yourfolder/your-sub-folder/yourfile.php" >/dev/null 2>&1
1. Adding this in cronjob is a good thing :
sleep $(expr $RANDOM \% 35);
It helps server to not struggle with executing all cronjobs of servers at same second (ssh must be activated)... Integration example, it must be put at begin of cron like this :
sleep $(expr $RANDOM \% 35); /usr/bin/wget -q -O /dev/null "http://www.yourdomain.com/yourfolder/your-sub-folder/yourfile.php" >/dev/null 2>&1
2. Avoid putting all your cron with minute value all same at 0, also space the minutes value of your cron to avoid a local conflict of your application.
3. Adding >/dev/null 2>&1 permit to stop sending emails at each cron execution
4. For wget cron, adding -q -O /dev/null permit to avoid wirting a file in your account at each cron execution
Specific scripts, and SHELL Scripts if ordinary cron don't work
A. cron with script sh
B. Specificity of certain php script involving shell commands and/or shell_exec, in our virtualized environment using CageFs from Cloudlinux, it is necessary that you add this in your crontab though shell :
And simply add cron in your cPanel :
* * * * * php -f /home/yourcpaneluser/yoordomain.com/cron.php >/dev/null 2>&1NB : if needed, check well and adapt your php.ini settings in your cpanel, about the default disable_functions, read doc of CMS/module and/or ask editor.
the -f option may not be appropriate for some scripts, such as when optimizing wordpress by disabling wp-cron.php in wordpress...
Disable wp-cron in wordpress by adding this in wp-config.php:
define ('DISABLE_WP_CRON', true);
and then adding the cron in cpanel (5 minutes schedule is recommended minimum, and a*update with your domain name):
/usr/bin/wget -q -O /dev/null "https://www.yourwebsite.com/wp-cron.php?doing_wp_cron"