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Setup LSWS as cache reverse proxy

Summary

LSWS can be setup as reverse proxy since earlier version (2.0). It can integrate with built-in cache to provide cache reverse proxy. This setup extends the benefit of LSWS cache for backends that not necessarily using LSWS web server. It also provides the benefit of LSWS anti-ddos as well.

Steps

1. Create Web Server External App

      Admin CP => Configuration => Server => External App        
         Type: Web Server
         Name: test-proxy
         Address: 10.1.2.3:80
         Max Connections: 150
         Initial Request Timeout (secs): 60
         Retry Timeout (secs): 0

Web Server type external app

Note:

  • Max Connections is for 1 CPU core. IOW, for 2 CPU license (minimum requirement for Cache), the total Max Conn is 300 (150×2).

2. Create vhost for the proxy service

      Admin CP => Configuration => Virtual Hosts
         Basic
         =====
           Base
             Virtual Host Name: proxy-vhost
             Virtual Host Root: $SERVER_ROOT/proxy/
             Config File: $VH_ROOT/conf/vhconf.xml
           Connection
             Max Keep-Alive Requests: 1000
           Security
             Follow Symbolic Link: No
             Enable Scripts/ExtApps: No
             Restrained: Yes
           Leave default for the rest.

vhost basic section

         General
         =======
           General
             Document Root: $VH_ROOT/html/

vhost general section

3. Create vhost level context

       Admin CP => Configuration => Virtual Hosts => Context
          Type: proxy
          URI: exp: /*
          Web Server: [Server Level]: test-proxy
          Leave default for the rest.

vhost level context

4. Map vhost to listener

5. Enable cache for the vhost (proxy)

5a. Enable cache at Server Level enable cache at server

5b. Set up cache policy at vhost Level vhost cache policy

6. Enable Per Client throttling for vhost (for http level anti-ddos)

vhost per client throttling

Note:

  1. Some configuration settings (vhost name, IP addresses, etc) shown in screenshot are for illustration purpose.
  2. The set up has been tested and worked on a production server running varnish+nginx+tomcat+postgresql, being able to defend 20000 requests/sec HTTP ddos attacks (with LiteSpeed Advance Anti-DDoS setup).
  3. Above setup can be easily extended to support proxy'ing multiple backends with each vhost (with its own web server type context) per each backend.
  4. Above setup also can be easily extended to support load balancing multiple backends by creating a loadbalancer context at vhost level based on a loadbalancer external app (server or vhost level) with proxy::backend* being its worker.
 
litespeed_wiki/reverse_proxy_cache.txt · Last modified: 2012/11/26 04:15 (external edit)