nginx主备域名绑定

http {
    upstream backend {
        server 192.168.1.1:80;
        server 192.168.1.2:80 backup;
        check interval=3000 rise=2 fall=5 timeout=1000 type=http;
        check_http_send "HEAD /health_check HTTP/1.0\r\n\r\n";
        check_http_expect_alive http_2xx http_3xx;
    }

    server {
        listen 80;
        server_name example.com;

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

http {
    upstream backend {
        server 192.168.1.1:80;
        server 192.168.1.2:80;
    }

    server {
        listen 80;
        server_name example.com;

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

http {
    upstream backend {
        server 192.168.1.1:80;
        server 192.168.1.2:80 down;  # 模拟备节点故障
    }

    server {
        listen 80;
        server_name example.com;

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