Complete Guide to Magento Caching

Cache Layers in Magento

Magento uses multiple cache layers: application cache (config, layout, block HTML), full page cache (Varnish or built-in), and browser cache. Understanding each layer is crucial for performance.

Varnish Configuration

Varnish is the recommended FPC for production. Configure VCL to handle cache invalidation, edge-side includes, and health checks.

Redis Backend

Use Redis for both default and page cache backends. Configure separate Redis databases for cache and sessions.

Cache Tags

Magento uses cache tags for targeted invalidation. When a product updates, only pages containing that product are purged. Understanding cache tags is essential for custom module development.