NGINX Cache Sync Helper

A lightweight Go-based background daemon that syncs NGINX FastCGI/Proxy cache clears across multiple WordPress replicas.
Designed for clustered or containerized environments where each replica maintains its own local NGINX cache, this tool ensures consistent cache invalidation by polling a shared MySQL database for updates.

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Features

• Polls central WordPress wp_options table for nginx_cache_last_cleared
• Compares to local state to determine if cache needs clearing
• Clears local NGINX cache when needed
• Stores last-seen timestamp in a local file

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WordPress Integration

Use this together with the companion plugin:

pds-uk/nginx-cache-helper

This WordPress plugin:

• Automatically clears the local NGINX cache on post, comment, plugin, or WooCommerce events
• Updates the nginx_cache_last_cleared value in the WordPress database
• Supports Composer installation:

composer require pds-uk/nginx-cache-helper