apache反向代理到jetty

apache和jetty组合使用有三种方式

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• There are three main ways to connect Apache to Jetty:  
•    1. Using Apache mod_proxy and a normal Jetty HTTP connector.  
•    2. Using Apache mod_proxy_ajp and the Jetty AJP connector.  
•    3. Using Apache mod_jk and the Jetty AJP connector.   
  

jetty推荐的是第一种

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• We recommend using the HTTP connectors for the following reasons:  
•     * Jetty performs significantly better with HTTP.  
•     * The AJP protocol is poorly documented and has many version irregularities.  
• If you must use AJP, the mod_proxy_ajp module is better than mod_jk. Previously, the load balancing capabilities of mod_jk meant that you had to use (tolerate) it, but with Apache 2.2, mod_proxy_balancer is available and works over HTTP and AJP connectors.   
  

第一种用mod_proxy，实际上是配置反向代理，只是简单的将url转发到jetty，如果要实现负载均衡，apache还需要加载mod_blancer。具体配置比较简单，首先在httpd.conf添加module

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• LoadModule proxy_module /usr/ali/apache2/modules/mod_proxy.so  
• LoadModule proxy_balancer_module /usr/ali/apache2/modules/mod_proxy_balancer.so  
• LoadModule proxy_http_module /usr/ali/apache2/modules/mod_proxy_http.so  
• LoadModule proxy_ajp_module /usr/ali/apache2/modules/mod_proxy_ajp.so  
• LoadModule jk_module /usr/ali/apache2/modules/mod_jk.so  
  

然后在httpd.conf末尾加上反向代理配置

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• ProxyRequests Off  
•   
• <Proxy *>  
• Order deny,allow  
• Allow from all  
• </Proxy>  
•   
• ProxyPass /test http://localhost:8080/  
• ProxyPass / http://localhost:8080/  
  

apache配置的是80端口，当访问http://localhost或者http://localhost/test时，请求应该转发到jetty,就是http://localhost:8080，配置完成后，启动apache，然后访问http://localhost，访问的是jetty页面。


如果要配置负载均衡，假设本机有两个jetty实例，监听端口分别是8080,8090。则简单的负载均衡配置部分如下

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• ProxyRequests Off  
•   
• <Proxy *>  
• Order deny,allow  
• Allow from all  
• </Proxy>  
•   
• ProxyPass /test balancer://mycluster  
• ProxyPass / balancer://mycluster  
•   
• <Proxy balancer://mycluster>  
• BalancerMember http://localhost:8080  
• BalancerMember http://localhost:8090  
• </Proxy>