nginx 负载均衡 ngx_http_upstream

例子1：－－－－－－－－－－－－－－－－－－－－－－－－－
upstream  backend  {
    server   backend1.example.com       weight=5;
    server   backend2.example.com:8080;
    server   unix:/tmp/backend3;
}

server {
    location / {
        proxy_pass  http://backend;
    }
}


例子2：－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
http {
    upstream myproject {
        server 127.0.0.1:8000 weight=3;
        server 127.0.0.1:8001;
        server 127.0.0.1:8002;   
        server 127.0.0.1:8003;
    }

    server {
        listen 80;
        server_name www.domain.com;
        location / {
            proxy_pass http://myproject;
        }
    }
}



例子3：－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
upstream sitename {
server 127.0.0.1:4000;
server 127.0.0.1:4001;
}

server {
listen 80;
server_name www.sitename.com;
rewrite ^(/.*) http://sitename.com$1 permanent;
}

server {
listen 80;
server_name sitename.com;
location / {
proxy_pass http://sitename;
}
}