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 events {
     worker_connections  1024;
 }
 
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     keepalive_timeout   65;
     ...
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     name: 'app',
     script: 'app.js',
     instances: 'max',
     exec_mode: 'cluster',
     autorestart: true,
     watch: false,
     max_memory_restart: '1G',
     env: {
       NODE_ENV: 'production'
     }
   }]
 };

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     listen   80;
     server_name  example.com;
 
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         proxy_pass http://localhost:3000;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';
         proxy_set_header Host $host;
         proxy_cache_bypass $http_upgrade;
     }
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