一、安装jvm_route

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http ://nginx-upstream-jvm-route.googlecode.com/svn/trunk/nginx-upstream-jvm-route-read-only
 cd /usr/src/nginx-1.2.1
 patch - p0  < /usr/local/nginx/nginx_upstream-jvm-route-read-only/jvm_route.patch
 ./configure --add-module=/usr/local/nginx/nginx-upstream-jvm-route-read-only
 make & make install

二、nginx 设置

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upstream www.linuxidc.com {
  server 192.168.1.116:8080 srun_id=a;
    这里 srun_id=a  对应的是 server1  resin 配置里的 server id="a"
  server 192.168.1.117:8081 srun_id=b;
    这里 srun_id=b  对应的是 server2 resin 配置里的 server id="b"
  jvm_route $cookie_JSESSIONID|sessionid;
 }

三、tomcat 设置

192.168.0.116设置：
修改tomcat/conf/server.xml

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<Engine name="Catalina" defaultHost="localhost" jvmRoute="a">

192.168.0.117设置：
修改tomcat/conf/server.xml

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<Engine name="Catalina" defaultHost="localhost" jvmRoute="b">

四、配置完成

重启nginx和tomcat