Nginx Selective Cache Purge Module

A module to purge cache by GLOB patterns. The supported patterns are the same as supported by Redis.

This module is not distributed with the Nginx source. See the installation instructions.

Configuration

An example:

pid         logs/nginx.pid;
error_log   logs/nginx-main_error.log debug;

# Development Mode
# master_process      off;
# daemon              off;
worker_processes    1;
worker_rlimit_core  500M;
working_directory /tmp;
debug_points abort;

events {
    worker_connections  1024;
    #use                 kqueue; # MacOS
    use                 epoll; # Linux
}

http {
    default_type    application/octet-stream;

    access_log      logs/nginx-http_access.log;
    error_log       logs/nginx-http_error.log;

    proxy_cache_path /tmp/cache_zone levels=1:2 keys_zone=zone:10m inactive=10d max_size=100m;
    proxy_cache_path /tmp/cache_other_zone levels=1:2 keys_zone=other_zone:1m inactive=1d max_size=10m;

    #selective_cache_purge_redis_unix_socket "/tmp/redis.sock";
    #
    # or
    #
    #selective_cache_purge_redis_host "localhost";
    #selective_cache_purge_redis_port 6379;

    selective_cache_purge_redis_database 1;

    server {
        listen          8080;
        server_name     localhost;

        # purging by prefix
        location ~ /purge(.*) {
            selective_cache_purge_query "$1*";
        }

        location / {
            proxy_pass http://localhost:8081;

            proxy_cache zone;
            proxy_cache_key "$uri";
            proxy_cache_valid 200 1m;
        }
    }

    server {
        listen          8090;
        server_name     localhost;

        # purging by extension
        location ~ /purge/.*(\..*)$ {
            #purge by extension
            selective_cache_purge_query "*$1";
        }

        location / {
            proxy_pass http://localhost:8081;

            proxy_cache other_zone;
            proxy_cache_key "$uri";
            proxy_cache_valid 200 1m;
        }
    }

    server {
        listen          8081;
        server_name     localhost;

        location / {
            return 200 "requested url: $uri\n";
        }
    }
}

Installation instructions

This module requires:

• Redis 2.8 or newer. Install it with your favourite package manager - apt-get, yum, brew - or download Redis and compile it.
• hiredis 0.11.0. Install it with your favourite package manager - apt-get, yum, brew - or download hiredis and compile it.
• redis_nginx_adapter library

Download Nginx Stable source and uncompress it. You must then run ./configure with --add-module pointing to this project as usual, referencing the up-to-date hiredis/redis_nginx_adapter lib and include if they are not on your default lib and include folders. Something in the lines of:

$ ./configure \
    --with-ld-opt='-L/usr/lib/ ' \
    --with-cc-opt='-I/usr/include/hiredis/ ' \
    --add-module=/path/to/nginx-selective-cache-purge-module
$ make
$ make install

Running tests

This project uses nginx_test_helper on the test suite. So, after you've installed the module, you can just install the necessary gems:

$ bundle install --gemfile=test/Gemfile

And run rspec pointing to where your Nginx binary is (default: /usr/local/nginx/sbin/nginx):

$ NGINX_EXEC=/path/to/nginx rspec test/

Changelog

This is still a work in progress. Be the change. And take a look on the Changelog.