Cache Sniper for Nginx

Description

Nginx has a built-in FastCGI cache, which acts as a reverse proxy cache at the webserver layer. The Cache Sniper for Nginx WordPress plugin lets you purge this cache from within WordPress. Here are some key features:

  • Purge the entire cache from the menu bar
  • Manually purge individual pages
  • Configure pages to purge automatically when updated
  • Configure pages to purge automatically when comments are created/updated/deleted.
  • Configure Settings via WP CLI

For more info on using this plugin with a pre-configured Nginx stack running in AWS, follow this link.

Screenshots

  • screenshot-1.png

Installation

  1. Upload the plugin files to the /wp-content/plugins/cache-sniper-nginx directory, or install the plugin through the WordPress plugins screen directly.
  2. Activate the plugin through the Plugins screen in WordPress
  3. Go to Tools -> Nginx Cache Sniper to configure the plugin

Usage

  1. Clear the entire cache by going to the Nginx Cache Sniper drop-down in the top Menu bar, and click Clear entire cache.
  2. To clear the cache for an individual Post (or Page), click on Clear cache for this page, either on the All Posts or Post detail pages.
  3. When configured to do so, you can purge the cache for a Post (or Page) by updating it.
  4. When configured to do so, you can purge the cache for a Post (or Page) where a comment was created/updated/deleted.

Configuration Settings

Cache Sniper for Nginx comes with the following settings:

  1. Cache Path: This is the filesystem path where the FastCGI cache is stored on-disk. Set this to the value you used for fastcgi_cache_path from your Nginx configuration. Note: Nginx needs read/write access to this location.
  2. Automatically clear page cache on content update: Check this box to automatically purge the cache when a page is updated. This only purges the updated page — it does not clear the entire cache.
  3. Automatically clear page cache on comment: Check this box to automatically purge the cache when a comment is created/updated/deleted. This only purges the cache of the page where the comment resides — it does not clear the entire cache.

Configuration via WP CLI

For those scripting out infrastructure, Cache Sniper for Nginx can be configured via WP CLI:

  1. wp plugin activate cache-sniper-nginx
  2. wp option add nginx_cache_sniper_path '/var/lib/nginx/cache'
  3. wp option add nginx_cache_sniper_auto_clear 1
  4. wp option add nginx_cache_sniper_auto_clear_comments 1

For instructions on setting up FastCGI caching with Nginx, refer to this Digital Ocean blog post.

Server-side configuration

There are a few things that need to be configured on the server in order for this plugin to work.

  1. Be sure to set levels=1:2 for fastcgi_cache_path. For example: fastcgi_cache_path /var/lib/nginx/cache levels=1:2 keys_zone=CACHE:100m;
  2. The Linux account running Nginx needs read-write permissions to the cache path on disk.

FAQ

Installation Instructions
  1. Upload the plugin files to the /wp-content/plugins/cache-sniper-nginx directory, or install the plugin through the WordPress plugins screen directly.
  2. Activate the plugin through the Plugins screen in WordPress
  3. Go to Tools -> Nginx Cache Sniper to configure the plugin

Usage

  1. Clear the entire cache by going to the Nginx Cache Sniper drop-down in the top Menu bar, and click Clear entire cache.
  2. To clear the cache for an individual Post (or Page), click on Clear cache for this page, either on the All Posts or Post detail pages.
  3. When configured to do so, you can purge the cache for a Post (or Page) by updating it.
  4. When configured to do so, you can purge the cache for a Post (or Page) where a comment was created/updated/deleted.

Configuration Settings

Cache Sniper for Nginx comes with the following settings:

  1. Cache Path: This is the filesystem path where the FastCGI cache is stored on-disk. Set this to the value you used for fastcgi_cache_path from your Nginx configuration. Note: Nginx needs read/write access to this location.
  2. Automatically clear page cache on content update: Check this box to automatically purge the cache when a page is updated. This only purges the updated page — it does not clear the entire cache.
  3. Automatically clear page cache on comment: Check this box to automatically purge the cache when a comment is created/updated/deleted. This only purges the cache of the page where the comment resides — it does not clear the entire cache.

Configuration via WP CLI

For those scripting out infrastructure, Cache Sniper for Nginx can be configured via WP CLI:

  1. wp plugin activate cache-sniper-nginx
  2. wp option add nginx_cache_sniper_path '/var/lib/nginx/cache'
  3. wp option add nginx_cache_sniper_auto_clear 1
  4. wp option add nginx_cache_sniper_auto_clear_comments 1

For instructions on setting up FastCGI caching with Nginx, refer to this Digital Ocean blog post.

Server-side configuration

There are a few things that need to be configured on the server in order for this plugin to work.

  1. Be sure to set levels=1:2 for fastcgi_cache_path. For example: fastcgi_cache_path /var/lib/nginx/cache levels=1:2 keys_zone=CACHE:100m;
  2. The Linux account running Nginx needs read-write permissions to the cache path on disk.
Do I need to recompile Nginx to purge the cache?

No. Cache Sniper for Nginx works without relying on any custom Nginx modules. This means you can easily keep Nginx updated with your normal package manager.

Reviews

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Contributors & Developers

“Cache Sniper for Nginx” is open source software. The following people have contributed to this plugin.

Contributors

Changelog

1.0.2

  • Fixed a bug that caused cache_actions.js file not to load.

1.0.1

  • Added support for page cache invalidation on comment create/udpate/delete.

1.0.0

  • First version, hope you like it!