apache反向代理到jetty
apache和jetty组合使用有三种方式
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.
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jetty推荐的是第一种
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.
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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
LoadModule proxy_module /usr/ali/apache2/modules/mod_proxy.soLoadModule proxy_balancer_module /usr/ali/apache2/modules/mod_proxy_balancer.soLoadModule proxy_http_module /usr/ali/apache2/modules/mod_proxy_http.soLoadModule proxy_ajp_module /usr/ali/apache2/modules/mod_proxy_ajp.soLoadModule jk_module /usr/ali/apache2/modules/mod_jk.so
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然后在httpd.conf末尾加上反向代理配置
ProxyRequests Off<Proxy *>Order deny,allowAllow from all</Proxy>ProxyPass /test http://localhost:8080/ProxyPass / http://localhost:8080/
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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
ProxyRequests Off<Proxy *>Order deny,allowAllow from all</Proxy>ProxyPass /test balancer://myclusterProxyPass / balancer://mycluster<Proxy balancer://mycluster>BalancerMember http://localhost:8080BalancerMember http://localhost:8090</Proxy>?
