nginx负载均衡

 

     1.轮询

轮询方式是nginx负载均衡的默认策略，根据每个server的权重值来轮流发送请求，例如：

upstream backend {
server zz1.zz.com;
server zz2.zz.com;
}

  2.权重轮询

upstream backend {
server zz1.zz.com weight=2;
server zz2.zz.com;
}

 3. ip hash
根据用户所请求的ip计算出hash值，不同用户发送到各自hash后的服务器上

upstream backend {
ip_hash;

server zz1.zz.com;
server zz2.zz.com;
}