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Docker Bird Eye View - Coggle Diagram

- - - - 1 for serving frontend
      - 1 for taking care of backend
      - 1 for database
      - etc
    - - if you do "docker run ubuntu", it will stop
        because no process / os being processed
        ubuntu is just an image of OS, used as BASE image for OTHER apps
- - - - BUILT upon EXISTING image (extends)
      - example
        
        node.js image
        
        sql image
    - - ENV
      - EXPOSE
    - - FROM
        
        says that "this is an image!"
        
        "every instructions that follows, will use this image"
        
        e.g
        FROM <image>:tag
        FROM node:20
        
        format:
        FROM <image>[:tag]
        
        just CTRL CLICK the image you added, you can find the tags in their website
      - WORKDIR
        
        similar to cd in command line
        
        all code that follows, will be executed at that working directory
        
        ADD
        
        CMD
        
        RUN
        
        COPY
        
        ENTRY POINT
      - RUN
        
        execute files here
        
        executed at build time
        
        usually anything to PREPARE the image
        
        e.g
        npm install
        
        executed on local machine
      - CMD
        
        executed everytime a container STARTS
        
        e.g
        npm run start
        
        executed on container
      - COPY
        
        copies from local machine, to docker image
        
        COPY <local_machine> <docker_image>
        
        used mainly for webapps
        
        in docker, dependency comes first rather than the app
        
        COPY . . in the working directory, with .dockerignore of node_modules
- - - - OS
      - app software
      - applicaiton code
    - - a snapshot, of system, at a particular time