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sudo apt-get update
sudo apt-get install nginx

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http {
 server {
     listen 80;
     server_name yourdomain.com;

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

 upstream backend-server {
     server backend1 ip:port;
     server backend2 ip:port;
     server backend3 ip:port;
     # ¿ÉÒÔƾ֤ÐèÇóÉèÖøü¶àµÄºó¶ËЧÀÍÆ÷
 }
}

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sudo systemctl restart nginx

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http {
 upstream backend-server {
     server backend1 ip:port;
     server backend2 ip:port;
     server backend3 ip:port;
     # ¿ÉÒÔƾ֤ÐèÇóÉèÖøü¶àµÄºó¶ËЧÀÍÆ÷
     # ĬÈϽÓÄÉÂÖѯսÂÔ
 }
}

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for i in {1..10}; do curl yourdomain.com; done

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