How to clean nginx cache

Use the purge directive to delete cached files for a specific URL pattern. Use Lua script to delete cached files based on conditions. Reload the Nginx configuration to clear all cached files. Use the Nginx Nagios plug-in to clear cached files through URL mode. Manually delete cached files in the /var/cache/nginx directory.

How to clean up Nginx cache

Nginx, as a popular web server, has caching capabilities that can improve website response speed and reduce server load. However, as cached data continues to accumulate, it sometimes needs to be cleaned to ensure efficient operation. Here are the ways to help clean up Nginx cache:

1. Use the purge directive

The purge directive can be used to delete cached files that match the specified URL pattern. To use this directive, edit the Nginx configuration file (usually /etc/nginx/nginx.conf) and add the following line in the http {} block:

 <code>location /purge { valid_methods PURGE; purge /file_to_delete$; }</code>

where /file_to_delete$ is the path to the cache file to be deleted.

2. Using Lua scripts

Lua scripts provide more flexible cache cleaning options. You can write scripts to delete cached files based on specific conditions (such as file modification time or request frequency). For more information, see Purge with Lua in the official Nginx documentation.

3. Reload the Nginx configuration

Reloading the Nginx configuration will cause all cache files to be deleted. This is a simple and crude method, but it can effectively clear the cache. To reload the configuration on a Linux system, run the following command:

 <code>sudo systemctl reload nginx</code>

4. Use the Nginx Nagios plugin

The Nginx Nagios plug-in provides a range of useful commands for monitoring and managing Nginx caches. This includes the purge command, which allows you to clear cached files by passing URL patterns. Please refer to the plugin documentation for more information.

5. Manually delete cached files

Nginx cache files are usually stored in the /var/cache/nginx directory. You can manually browse the directory and delete the required files. However, be aware that modifying the server file system can pose risks.

Once the desired method is selected, the Nginx cache can be cleaned as needed. Regularly cleaning caches keeps Nginx running efficiently and ensures that the cache always contains the latest data.

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