Nginx reverse proxy cache Configuration

Here is an example and detailed description.

1. Http {
2. [...]
3. [...]
5. Proxy_cache_path/data/nginx/cache/one levels = keys_zone = one: 10 m max_size = 10g;
6. Proxy_cache_key "$ host $ request_uri ";
8. Server {
9. Server_name www. centos. bz centos. bz;
10. Root/home/www. centos. bz/web;
11. Index. php index.html index.htm;
12. Location /{
13. Proxy_pass http: // 127.0.0.1: 8080;
14. Proxy_set_header Host "www. centos. bz ";
15. Proxy_set_header X-Forwarded-For $ proxy_add_x_forwarded_for;
16. # Enable reverse proxy cache and use the cache with zone name one.
17. Proxy_cache one;
18. # Set the status code to 200 302 expiration time to 10 minutes
19. Proxy_cache_valid 200 302 10 m;
20. # Set the expiration time of Status Code 404 to 1 minute
21. Proxy_cache_valid 404 1 MB;
22. }
23. # Clear Cache
24. Location ~ /Purge (/.*){
25. # Allowed IP addresses
26. Allow 127.0.0.1;
27. Deny all;
28. Proxy_cache_purge one $ host $1 $ is_args $ args;
29. }
30. }
32. }

The cache of reverse proxy mainly involves the following commands:
Proxy_cache_path proxy_cache_key proxy_cache proxy_cache_valid.

Proxy_cache_path
This is the directory for caching. The syntax is as follows:
Proxy_cache_path path [levels = levels] keys_zone = name: size [inactive = time] [max_size = size] [loader_files = number] [loader_sleep = time] [loader_threshold = time]
Extensible context:
Http
Parameter description:
[Levels = levels]:
Set the number of cache directory layers, such as levels =, to create a two-tier directory cache. A maximum of three layers can be created. The first-level directory name is the last character of proxy_cache_key md5, and the second-level directory name is the penultimate 2-3 character, for example:
Proxy_cache_key md5 is b7f54b2df7773722d382f4809d42429c, then:
Levels =/data/nginx/cache/c/29/b7f54b2df7773722d382f4809dda-29c
Levels =/data/nginx/cache/c/29/650/b7f54b2df7773722d382f4809dda-29c

Keys_zone = name: size:
Defines the cache region name and size. The cache name is used for the proxy_cache command to set where the cache is placed, for example, proxy_cache one. The cache is placed in the cache zone named one, that is, the specific location specified by proxy_cache_path.

Proxy_cache_key
This command sets the parameter md5 to get the cached file name. The default value is $ scheme $ proxy_host $ request_uri, which is the protocol, host name, and request uri (including parameters) obtain the cached file name by using md5.
Proxy_cache_key is closely related to the following purge cache function.
Can be placed in the context, http server location

Proxy_cache
The reverse proxy cache setting command. Syntax: proxy_cache zone | off. The default value is off. Context: http server location.
You can put it in the specified location to cache the url that matches the location.

Proxy_cache_valid
Set the cache time of the specified status code. Syntax: proxy_cache_valid [code...] time.

In addition, the ngx_cache_purge plug-in must be installed for cache clearing. The installation method is as follows:

1. Cd/tmp
2. Wget http://labs.frickle.com/files/ngx_cache_purge-2.1.tar.gz
3. Tar xzf ngx_cache_purge-2.1.tar.gz
4. Cd/tmp
5. Wget http://nginx.org/download/nginx-1.4.2.tar.gz
6. Tar xzf nginx-1.4.2.tar.gz
7. Cd nginx-1.4.2
8. ../Configure -- prefix =/usr/local/nginx -- add-module =/tmp/ngx_cache_purge-2.1
9. Make & make install

Refer:
Http://wiki.nginx.org/HttpProxyModule
Http://labs.frickle.com/nginx_ngx_cache_purge/

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For more information, see http://www.centos.bz/2013/08/nginx-proxy-pass-cache-config/.