配置策略

轮询、hash、最小连接数、权重

轮询

分配相同的任务，是NGINX的默认策略

加权

权重越高，任务越高

upstream tomcats { 
    server 192.168.1.173:8080 weight=2;
    server 192.168.1.190:8080 weight=5; 
    server 192.168.1.174:8080 weight=5; 
    server 192.168.1.175:8080 weight=1; 
}

ip_hash

upstream tomcats {
    ip_hash; 
    server 192.168.1.173:8080;
    server 192.168.1.174:8080 down; 
    server 192.168.1.175:8080;
}

一致性HASH

url_hash

upstream tomcats {
    hash $request_uri;
    server 192.168.244.1:8080;
    server 192.168.244.2:8080;
    server 192.168.244.3:8080;
    server 192.168.244.4:8080;
 
}

leash_conn 最少连接数

upstream tomcats{
        leash_conn;
        server localhost:8081;
        server localhost:8082;
        server localhost:8083;
    }