Purging cached content in Nginx - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does purging cached content in nginx mean?

Purging cached content means removing stored copies of web pages or files from nginx's cache so that fresh content is fetched from the original source.

intermediate

Which nginx module is commonly used to enable cache purging?

The ngx_cache_purge module allows selective removal of cached content in nginx.

beginner

What is a simple method to purge all cached content in nginx?

You can delete the cache directory files manually and then reload nginx to clear all cached content.

intermediate

How can you configure nginx to allow HTTP requests to purge cache?

By adding a location block with the 'proxy_cache_purge' directive and securing it with access controls, nginx can accept purge requests via HTTP methods like PURGE or DELETE.

beginner

Why is it important to secure cache purge requests in nginx?

Because allowing anyone to purge cache can cause performance issues and unwanted content refreshes, so access should be restricted to trusted users or IPs.

What happens when you purge cached content in nginx?

A nginx stops serving any content

B nginx restarts automatically

C nginx cache size increases

D Cached files are deleted so fresh content is fetched

Purging removes cached files so nginx fetches fresh content from the origin.

Which HTTP method is commonly used to send a cache purge request in nginx?

A GET

B POST

C PURGE

D PUT

The PURGE method is often used to request cache removal in nginx.

What is a safe practice when enabling cache purging in nginx?

A Restrict purge requests to trusted IPs

B Disable cache completely

C Allow purge requests from all IPs

D Use GET requests for purging

Restricting purge requests prevents unauthorized cache clearing.

Which nginx directive helps configure cache purging?

A proxy_cache_purge

B proxy_cache_path

C proxy_pass

D proxy_cache_valid

proxy_cache_purge enables purging cached content via HTTP requests.

How can you clear all cached content manually in nginx?

A Restart nginx service

B Delete cache files and reload nginx

C Run 'nginx -s purge'

D Change nginx configuration

Deleting cache files and reloading nginx clears all cached content.

Explain how to configure nginx to allow purging cached content via HTTP requests.

Think about nginx configuration and security.

Describe why and when you would purge cached content in nginx.

Consider cache freshness and content updates.