NGinx load balancing strategy

upstream backserver {
server 192.168.0.14;
server 192.168.0.15;
}

upstream backserver {
server 192.168.0.14 weight=10;
server 192.168.0.15 weight=10;
}

upstream backserver {
ip_hash;
server 192.168.0.14:88;
server 192.168.0.15:80;
}

upstream backserver {
server server1;
server server2;
fair;
}

upstream backserver {
server squid1:3128;
server squid2:3128;
hash $request_uri;
hash_method crc32;
}

proxy_pass http://backserver/ ;
upstream backserver{
ip_hash;
server 127.0.0.1:9090 down; (down 表示单前的server暂时不参与负载)
server 127.0.0.1:8080 weight=2; (weight 默认为1.weight越大，负载的权重就越大)
server 127.0.0.1:6060;
server 127.0.0.1:7070 backup; (其它所有的非backup机器down或者忙的时候，请求backup机器)
}