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By default, a set of alternate sizes are generated for images that are uploaded to a site’s WordPress media library. These alternate sizes are referred to as “intermediate images”. WordPress Core defines a default array of intermediate image sizes: thumbnail, medium, medium_large, and large. The pixel dimensions for each of these default sizes can be defined in the Settings –> Media screen of the WordPress Admin dashboard.
Default behavior of image files (e.g., jpg, png, gif) that are located in a site’s /uploads/ directory, served by the VIP File System:
The system temp directory (/tmp) is a local, writeable path on an application’s web servers on the VIP Platform. The /tmp directory is most commonly used to perform local manipulations to temporary files. For example, transferring a ZIP archive to /tmp, extracting its contents, then uploading the contents to the WordPress site’s wp-content/uploads/ directory on the VIP File System.
On most platforms, media files uploaded to a WordPress site are stored in a filesystem local to the site’s web server. On the VIP Platform, media files uploaded or imported to a WordPress environment are stored on the VIP File System, which is an external object store. A WordPress site’s /wp-content/uploads/ directory is mapped to this external object store. This design provides better security and allows VIP’s CDN to more easily scale access to a site’s media.
VIP’s cron infrastructure leverages WP-Cron provided by WordPress Core, and cron jobs are initiated and regulated by Automattic’s Cron Control plugin. VIP’s Cron Control provides an optimized SQL table for WordPress Cron events. This approach satisfies the highly concurrent querying commonly seen on VIP sites. Each named event in the queue is handled in parallel with other events, allowing for a large event handling capacity. The VIP cron system orchestrates the activity of the event workers in the different containers, to avoid conflicts with two workers processing the same event.
New Relic is an application performance monitoring (APM) tool used to monitor the code and browser performance for WordPress environments or for Node.js environments. On WordPress VIP, New Relic an Integration that can be added to an organization then activated on any application environment.
The VIP Dashboard is a portal for application management, and for users to interact with the WordPress and Node.js VIP Platform environments that belong to those applications.
The behavior of the page cache does not vary for most cookies. For sites that personalize content based on a cookie that is not listed below, the response will be cached and served to the next user regardless of whether they have that cookie with the same value or not.
Custom configurations can be added to vip-config.php to handle redirects for secondary domains to the domain currently assigned to a WordPress site.
VIP helper functions for broader redirects: