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Section 11 : Docker - Coggle Diagram

- - - - Monolithic Vs Microservices
        
        You can think of them as pure function - we try to make everything small so that we have a predictable function that takes an input and returns an output with hopefully no side effects
        
        We will learn how to do these.
        
        They idea of breaking down apps into small pieces was popularised by container services like Docker - Which we are going to talk about.
- - - - You see with docker container they wrap the software in a complete file system that contains everything it needs to run. Just like we had in virtual machines, you had code, runtime, system tools, system libraries. Anything that you could install on a server you can use with docker. And again this garuntees that it will always run the same regardless of the environment it is running.
      - Now Containers are lightweight - alternative to the full machine/virtualization or virtual machines, therefore they're designed, unlike VM for running just single application on each container because they are so small and thin.
        
        And this is a popular concept of micro services that we talked about. Containers use the hosts OS - they don't have their own OS like we have with VM, They use the host OS and because that they need just a few seconds and your container application is up and running a lot faster that we had with VM.
        
        So with Docker container we're able to have fast and easy access to run there small single application and just have multiple of these things - just create as many container as you want.
        
        They are easy to just grow and grow as you scale, as you have more users.
        
        And that's when you start getting into things like containers Orchestration - where you now have to just manage all these containers, which by the way - if you ever heard Kubernetes that is what it does.