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added code and command samples for docker
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Diff for: ‎a-crash-course-on-docker/Dockerfile

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FROM nginx:alpine
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VOLUME /usr/share/nginx/html
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EXPOSE 80

Diff for: ‎a-crash-course-on-docker/README.md

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![a rather large whale](https://cdn-images-1.medium.com/max/2000/1*GQ6CAclmEnGe7PX4pg6sSA.jpeg)
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# A crash course on Docker
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The quick start guide you are looking for.
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You can take a look at the full article [here]() (issue #1, add article title once published).
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## TL;DR
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- "Why I need this?"
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- Quick Start
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- Real-life scenario
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## "Why I need this?"
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- What is Docker?
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- What is a VM?
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- What is CaaS?
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- Using automation
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## Quick Start
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- Installation
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**Ubuntu**
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```bash
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$ sudo apt-get update
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$ sudo apt-get install -y docker-ce
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$ sudo systemctl status docker
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// output //
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● docker.service - Docker Application Container Engine
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Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
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Active: active (running) since Sun 2018-01-14 12:42:17 CET; 4h 46min ago
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Docs: https://docs.docker.com
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Main PID: 2156 (dockerd)
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Tasks: 26
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Memory: 63.0M
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CPU: 1min 57.541s
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CGroup: /system.slice/docker.service
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├─2156 /usr/bin/dockerd -H fd://
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└─2204 docker-containerd --config /var/run/docker/containerd/containerd.toml
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```
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If the system service is stopped.
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```bash
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$ sudo systemctl start docker && sudo systemctl enable docker
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```
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Run Docker without **sudo**
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```bash
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$ sudo usermod -aG docker ${USER}
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$ su - ${USER}
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$ id -nG
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```
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If you see your username is the list of usernames, you're set.
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**Mac**
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Download and install.
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- https://docs.docker.com/docker-for-mac/install/
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**Windows**
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Download and install.
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- https://docs.docker.com/docker-for-windows/install/
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- Create a container
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```bash
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$ docker create -it ubuntu:16.04 bash
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```
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- List all containers
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```bash
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$ docker ps -a
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// output //
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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7643dba89904 ubuntu:16.04 "bash" X min ago Created name
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```
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- Start a container where in this case `7643dba89904` is the `<container_id>`
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```bash
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$ docker start 7643dba89904
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```
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- List only running containers
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```bash
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$ docker ps
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```
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- Connect to a container
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```bash
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$ docker attach 7643dba89904
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```
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- Delete a container
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```bash
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$ docker rm 7643dba89904
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```
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## Real-life scenario
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- Create a container and bind a volume to the host machine
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- In this case it will bind the current working directory from the host machine where you run the command in the terminal
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```bash
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$ docker create -it -v $(pwd):/var/www ubuntu:latest bash
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```
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- Create and start a container with a single command
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- `-d` flag tells the container to run detached, in the background, meaning you can go ahead and attach to it right away.
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```bash
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$ docker run -it -d ubuntu:16.04 bash
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```
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- Stop a running container
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```bash
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$ docker stop <container_id>
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```
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### Using the config files
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- Check out the **Dockerfile**, **docker-compose.yml**, and the **index.html**.
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#### Build an image from a **Dockerfile**
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```bash
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$ docker build . -t webserver:v1
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```
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- List created Docker images
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```bash
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$ docker images
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```
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### Run the created image
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```bash
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$ docker run -v $(pwd):/usr/share/nginx/html -d -p 8080:80 webserver:v1
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```
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#### Run with docker-compose
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- The `-d` signals docker-compose to run detached, then you can use `$ docker-compose ps` to see what’s currently running, or stop docker-compose with `$ docker-compose stop`.
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```bash
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$ docker-compose up (-d)
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```
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### Deleting images and containers
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```bash
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$ docker rmi <image_id>
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$ docker rm <container_id>
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```
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Happy Dockering! :D

Diff for: ‎a-crash-course-on-docker/docker-compose.yml

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version: '2'
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services:
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web:
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build: .
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ports:
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- "8080:80"
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volumes:
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- .:/usr/share/nginx/html

Diff for: ‎a-crash-course-on-docker/index.html

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<html>
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<head>
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<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" integrity="sha256-MfvZlkHCEqatNoGiOXveE8FIwMzZg4W85qfrfIFBfYc= sha512-dTfge/zgoMYpP7QbHy4gWMEGsbsdZeCXz7irItjcC3sPUFtf0kuFbDz/ixG7ArTxmDjLXDmezHubeNikyKGVyQ==" crossorigin="anonymous">
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<title>Docker Quick Start</title>
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</head>
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<body>
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<div class="container">
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<h1>Hello Docker</h1>
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<p>This means the nginx server is working.</p>
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</div>
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</body>
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</html>

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