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Webservers

  • Flask, Django, Express (NodeJS), Spring (Java) are web frameworks.
    • They help us easily develop web applications.
How do we serve our applications so that it runs and listens on a port to respond back to the users?
  • In some frameworks (like Flask) it provides a way to run the application using the internal web server built into it. attachments/Pasted image 20220913232815.jpg
  • But this method is not recommended for hosting the application in a production environment.
  • This is the job of a web server.

  • How to deploy flask to production

    • We can use Gunicorn, uWSGI, etc.
    • These are production grade web servers.

  • A web framework helps us develop application code but a web server hosts this application.

  • A web server can host multiple applications at the same time.
  • NGINX and Apache Web Server servers are good example of servers that serve static content whereas web servers such as gunicorn, apache tomcat are good examples of dynamic web servers.
    • attachments/Pasted image 20220913162905.jpg
Static web servers are usually referred to as web servers and dynamic web servers are referred to as application servers.

  • Using gunicorn for flask

    • gunicorn app:app
    • gunicorn app:app -w 2: getting 2 workers

  • For nodejs (Express) it is advised to use pm2, supervisord, forever instead of just running nodejs application.

    • PM2 is a production process manager for Node.js applications with a built-in load balancer.
    • It allows you to keep applications alive forever, to reload them without downtime and to facilitate common system admin tasks.
    • pm2 start app.js
    • pm2 start app.js -i 4 if you want more instances

Last updated: 2022-09-13