+【原创】+nginx负载均衡

概念：
      负载均衡建立在现有网络结构之上，它提供了一种廉价有效透明的方法扩展网络设备和服务器的带宽、增加吞吐量、加强网络数据处理能力、提高网络的灵活性和可用性nginx：配置
      

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upstream tomcatserver1 {         server 192.168.3.43:8080;         server 192.168.3.43:8082; #多加了此台服务器 }     upstream tomcatserver2 {         server 192.168.3.43:8082;     }    server {         listen       80;         server_name  8080.zcinfo.com;           #charset koi8-r;           #access_log  logs/host.access.log  main;           location / {             proxy_pass   http://tomcatserver1;             index  index.html index.htm;         }      }     server {         listen       80;         server_name  8082.zcinfo.com;           #charset koi8-r;           #access_log  logs/host.access.log  main;           location / {             proxy_pass   http://tomcatserver2;             index  index.html index.htm;         }     } 如果两台服务器性能差不多这样设置重启nginx就行了，但是现在假如两台服务器性能不一样，还需要设置性能权重，让性能高服务器做更多事情。只需要加入weight=?就行了，如下：   upstream tomcatserver1 {         server 192.168.3.43:8080 weight=2;         server 192.168.3.43:8082 weight=1; }     upstream tomcatserver2 {         server 192.168.3.43:8082;     }    server {         listen       80;         server_name  8080.zcinfo.com;           #charset koi8-r;           #access_log  logs/host.access.log  main;           location / {             proxy_pass   http://tomcatserver1;             index  index.html index.htm;         }      }     server {         listen       80;         server_name  8082.zcinfo.com;           #charset koi8-r;           #access_log  logs/host.access.log  main;           location / {             proxy_pass   http://tomcatserver2;             index  index.html index.htm;         }     }