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upstream backend {
 least_conn;   #ʹÓÃ×îÉÙÅþÁ¬Ëã·¨
 server backend1.example.com;
 server backend2.example.com;
}

server {
 listen 80;
 location / {
     proxy_pass http://backend;  #ת·¢µ½backendºó¶ËЧÀÍÆ÷×é
 }
}

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server {
 listen 80;
 server_name backend1.example.com;
 ...
}

server {
 listen 80;
 server_name backend2.example.com;
 ...
}

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from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello():
 return "Hello, World!"

if __name__ == '__main__':
 app.run(host='0.0.0.0', port=5000)

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http {
 upstream backend {
     least_conn;
     server 192.168.0.1:5000;
     server 192.168.0.2:5000;
 }

 server {
     listen 80;
     location / {
         proxy_pass http://backend;
     }
 }
}

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