nginx:loadBalance

nginx负载均衡
http
{
      #include       conf/mime.types;
      include       mime.types;
      default_type  application/octet-stream;
      include       vhost/*.conf;

      keepalive_timeout 120;

      tcp_nodelay on;

      upstream  www.samson.com  {
              server   127.0.0.1:8080;
              # server   192.168.1.3:80;
              # server   192.168.1.4:80;
              # server   192.168.1.5:80;
      }

      server
      {
              listen  80;
              server_name  www.samson.com;

              location / {
                       proxy_pass        http://www.samson.com;
                       proxy_set_header   Host             $host;
                       proxy_set_header   X-Real-IP        $remote_addr;
                       proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
              }

              log_format  www_samson_com  '$remote_addr - $remote_user [$time_local] $request '
                                '"$status" $body_bytes_sent "$http_referer" '
                                '"$http_user_agent" "$http_x_forwarded_for"';
              access_log  logs/www.log  www_samson_com;
      }

}

在http节点里添加:
#定义负载均衡设备的 Ip及设备状态
upstream myServer {  
    server 127.0.0.1:9090 down;
    server 127.0.0.1:8080 weight=2;
    server 127.0.0.1:6060;
    server 127.0.0.1:7070 backup;
}
在需要使用负载的Server节点下添加
proxy_pass http://myServer;
upstream 每个设备的状态:
down 表示单前的server暂时不参与负载
weight  默认为1.weight越大,负载的权重就越大。
max_fails :允许请求失败的次数默认为1.当超过最大次数时,返回proxy_next_upstream 模块定义的错误
fail_timeout:max_fails 次失败后,暂停的时间。
backup: 其它所有的非backup机器down或者忙的时候,请求backup机器。所以这台机器压力会最轻。

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转载自samson870830.iteye.com/blog/2384802
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