WP-Cron works hard to eliminate race conditions, but they can still happen, especially on high traffic sites. Race condition: When more than one user visits your site and triggers WP-Cron to execute the same job.The main issues that come up are race conditions and long running processes. You might run into problems with WP-Cron if your WordPress-powered site is high traffic. Pantheon Cron jobs do not run in sleeping environments. Low traffic WordPress sites on Pantheon are put to sleep after either one or twelve hours pass without site visitors (refer to idle containers for more information). Regardless of how many jobs WP-Cron has to execute, all jobs are run in the background so that your site's performance is not adversely affected. This doesn't mean your page will be slow from previous jobs when someone eventually visits your site. WP-Cron will skip jobs in WordPress sites with low traffic on WordPress Multisite installations that do not have Pantheon Cron. Troubleshooting Problems With Low Traffic Sites Using your own server is not safer than using a web-based Cron service. You must learn how to correctly set up a Cron job and use wget, curl, or a similar command to fetch a web page. You can use the Cron service to make a call to the wp-cron.php script if you administer your own server. This variable must be empty for Cron to work correctly. This line must be above the require_once expression that pulls in wp-config-pantheon.php:ĭo not add a value to the doing_wp_cron query variable. Pantheon's WordPress upstream disables WP-Cron by default.Īdd the following code to your wp-config.php file to ensure WP-Cron is disabled if you are on a Custom Upstream that does not have this setting, or the site is a WordPress Multisite. This will solve the problems with high traffic and low traffic sites discussed in the Troubleshooting section. You can use external crons if you want more control over your site's cron jobs, or if you don't want WP-Cron or Pantheon Cron to handle jobs internally. This plugin requires you to do a one-time installation of the WPX framework, which you can do straight from the plugin manager page. WPX Cron Manager Lite works similarly with a slightly different UI. You can also hook new actions into schedules or move existing actions to new schedules from within the Tools section. You can create, edit, run, or delete jobs immediately from within your WordPress admin dashboard. WP Crontrol, for example, shows all events scheduled for your site. There are several plugins you can use if you want to keep an eye on WP-Cron but don't like the command line. Replace with your site's name and replace with the desired environment ("dev", "test", "live", or the Multidev branch name. Use the command below to test WP-Cron and ensure everything is working correctly. Terminus, through WP-CLI, provides details, such as: Use Terminus to see job details in WP-Cron. Use a few simple commands from the command line, or one of several plugins, to find the exact jobs that WP-Cron runs. Several jobs are automatically configured during the installation of WordPress. WP-Cron comes pre-configured and ready to run, so you don't need to do anything to enable it on your WordPress sites. Currently, wp-cron.php does not have any known vulnerabilities or exploits, although it should be noted that no script on a server attached to the Internet is 100% secure. The $_GET value is not filtered, and is only used as a flag (not as an input for a process or variable). There is only one parameter you can pass that will affect the script, doing_wp_cron. The wp-cron.php file is subject to DDoS attacks, but generally, wp-cron.php is secure. WP-Cron is a PHP file that is usually located in the root directory of your WordPress installation. Use WP-Cron if you have WordPress Multisite installations. Pantheon Cron does not support WordPress Multisite installations due to the unpredictable customizations to domains or subdirectories and their mapping to subsites. Pantheon Cron will not execute jobs on inactive environments, including sleeping development environments.
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