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Client ──HTTP/80──? 192.168.65.135 (Nginx)

                    ├─? 192.168.65.131:80 (Web-1)

                    └─? 192.168.65.132:80 (Web-2)

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# Web-1

$ curl 192.168.65.131

13111

# Web-2

$ curl 192.168.65.132

132222

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upstream webserver {

    server 192.168.65.131:80 weight=1 max_fails=3 fail_timeout=15s;

    server 192.168.65.132:80 weight=1 max_fails=3 fail_timeout=15s;

}

server {

    listen       80;

    server_name  www.xiaotiantian.org;

    location / {

        proxy_pass         http://webserver;

        proxy_set_header   Host $host;

        proxy_set_header   X-Real-IP $remote_addr;

        proxy_connect_timeout 3s;

    }

}

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nginx -t

systemctl reload nginx

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for i in {1..6}; do curl www.xiaotiantian.org; done