有两台服务器，xx.xx.xx.01 和 xx.xx.xx.02，01 作为主服务器，在 01 上做负载均衡，配置如下 但是每次请求都会被转发到 02 这台服务器，即使

upstream balance {
    server  xx.xx.xx.01:80;
    server  xx.xx.xx.02:80;
}

xx.xx.xx.01 的配置

http {
  passenger_root /usr/local/rvm/gems/ruby-2.2.1/gems/passenger-5.0.11;
  passenger_ruby /usr/local/rvm/gems/ruby-2.2.1/wrappers/ruby;
  include       mime.types;
  default_type  application/octet-stream;
  sendfile      on;
  keepalive_timeout  65;
  upstream balance {
      server  xx.xx.xx.02:80;
  }
  server {
    listen 80;
    server_name www.xx.com;
    location / {
        proxy_pass         http://balance;
        proxy_set_header   Host             $host;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
    }
    root /home/my_project/public;
    passenger_enabled on;
  }
}

xx.xx.xx.02 的配置

http {
  passenger_root /usr/local/rvm/gems/ruby-2.2.1/gems/passenger-5.0.11;
  passenger_ruby /usr/local/rvm/gems/ruby-2.2.1/wrappers/ruby;
  include       mime.types;
  default_type  application/octet-stream;
  sendfile      on;
  keepalive_timeout  65;
  server {
    listen 80;
    server_name www.xx.com;
    root /home/my_project/public;
    passenger_enabled on;
  }
}