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###### tags: `Week 19` `W19D1`

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# Docker Intro and Week 19 Roadmap

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## Week 19 topics
- Intro and installation (today)
- Docker Containers & Images (Tuesday)
- AWS Lecture (Wednesday)
- Group Project Practice (Thursday)
- Project Starter Released (Friday)

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### Docker Containers & Images (Tuesday)

- A docker container is a lightweight package which contains only the software and dependencies we need to run a single process
- A container is a running image
- We'll explore containers & use the command line interface to work with them
- Images are templates for building docker containers
- Images allow you to make the same container over and over
- We can customize/build our own images using a Dockerfile

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### AWS (Wednesday)
- Learn how to integrate AWS into our project for media storage
- Flask/React refactor practice
- EOD on Scorecard Grading

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### Group Project Practice (Thursday)

- Practice project for your group!

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### Project Begins! (Friday)
- Finishing up all project documentation
- Mark Rodriguez talks to us about ~the future~!
- Walkthrough the project starter

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## What is Docker?

Docker is a platform that allows for development and deployment of software in packages called *containers*.

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### Docker containers

- Containers are:
- **Isolated:** They do not interact with your local filesystem/OS or other containers (unless we configure them to do so)
- **Ephemeral:** They can be deleted (& recreated) easily without worry
- **Lightweight:** They are single-purpose and contain only what they need for that purpose
- **Reproducible:** We can rebuild the same container over & over with a single command

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### How does Docker work?
#### Part 1: Your Computer

- In order to understand Docker, we should first discuss how our computers work to begin with.
- Your computer has physical hardware, an OS, and a kernel that interfaces between the two, which are all tightly coupled.
- When we build & deploy apps with this environment, we are limited to the performance of our machine and the libraries that are compatible with it.

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### How does Docker work?
#### Part 2: Why not use a VM?

- A VM has an OS that is *decoupled* from your computer's hardware. With VMs, can have multiple OSs running on a computer.
- A VM has a kernel & hypervisor. The kernel interfaces between the hardware and the OS. The hypervisor creates & runs a VM.
- A VM is heavy - we often don't need an entirely separate kernel & hypervisor just for the purposes of deploying an application.

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### VM Visualization

<img src="https://k21academy.com/wp-content/uploads/2020/06/Virtual_Machine_Architecture.png" />

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### How does Docker work?
#### Part 3: Docker containers

- A Docker container is like a mini-VM that is hardware agnostic - it doesn't care about the host OS.
- It is lightweight - it consists only of a small Linux distribution and necessary libraries & resources. It does not have its own kernel or hypervisor.
- This makes it much more scalable and allows us to run many more containers on one machine than VMs.

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### Docker Visualization

<img src="https://k21academy.com/wp-content/uploads/2020/06/output-onlinepngtools-16.png" />

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### Virtual Machine vs Docker

<img src="https://k21academy.com/wp-content/uploads/2020/05/2020_05_13_12_19_07_PowerPoint_Slide_Show_Azure_AZ104_M01_Compute_ed1_-1024x467.png" />

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### Cool... but why are we learning about Docker?
- We can easily scale an application using a cluster of containers on one or more machines
- We can easily share our application with others for testing & development
- We can build a template for our application called an *image*
- We can automate the process of building & deploying that image with *docker compose*
- We can run the same application on *any* machine without worrying about performance or incompatibilites

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### Group Project Planning
We will have time allotted each day this week to work on group project planning!

Use schedule from `Section-2-Resources/Module-6-Resources/group_project_resources/Flask-Group-Project.md` to help guide your planning this week.

***You will be required to have 4 features for this project, 2 full CRUD and 2 partial CRUD***

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### Today's itinerary [1/2]
1. Docker introduction
- [Docker video](https://www.youtube.com/watch?v=YFl2mCHdv24&ab_channel=JakeWright)

2. Docker installation (if not already installed):
- [Docker Products](https://www.docker.com/products/docker-desktop/)
- If you want to test your installation:
- `docker container run --rm hello-world`
- NOTE FOR WSL USERS: You must upgrade to WSL2 to use Docker

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### Today's itinerary [2/2]

Start meeting with your groups and project planning!