A crash course on Docker

The quick start guide you are looking for. You can take a look at the full article here (issue #1, add article title once published).

TL;DR

• "Why I need this?"
• Quick Start
• Real-life scenario

"Why I need this?"

• What is Docker?
• What is a VM?
• What is CaaS?
• Using automation

Quick Start

• Installation

Ubuntu

$ sudo apt-get update
$ sudo apt-get install -y docker-ce
$ sudo systemctl status docker


// output //

● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2018-01-14 12:42:17 CET; 4h 46min ago
     Docs: https://docs.docker.com
 Main PID: 2156 (dockerd)
    Tasks: 26
   Memory: 63.0M
      CPU: 1min 57.541s
   CGroup: /system.slice/docker.service
           ├─2156 /usr/bin/dockerd -H fd://
           └─2204 docker-containerd --config /var/run/docker/containerd/containerd.toml

If the system service is stopped.

$ sudo systemctl start docker && sudo systemctl enable docker

Run Docker without sudo

$ sudo usermod -aG docker ${USER}
$ su - ${USER}
$ id -nG

If you see your username is the list of usernames, you're set.

Mac Download and install.

• https://docs.docker.com/docker-for-mac/install/

Windows Download and install.

• https://docs.docker.com/docker-for-windows/install/

• Create a container

$ docker create -it ubuntu:16.04 bash

• List all containers

$ docker ps -a

// output //
CONTAINER ID  IMAGE        COMMAND  CREATED    STATUS   PORTS  NAMES
7643dba89904  ubuntu:16.04 "bash"   X min ago  Created         name

• Start a container where in this case 7643dba89904 is the <container_id>

$ docker start 7643dba89904

• List only running containers

$ docker ps

• Connect to a container

$ docker attach 7643dba89904

• Delete a container

$ docker rm 7643dba89904

Real-life scenario

• Create a container and bind a volume to the host machine
• In this case it will bind the current working directory from the host machine where you run the command in the terminal

$ docker create -it -v $(pwd):/var/www ubuntu:latest bash

• Create and start a container with a single command
• -d flag tells the container to run detached, in the background, meaning you can go ahead and attach to it right away.

$ docker run -it -d ubuntu:16.04 bash

• Stop a running container

$ docker stop <container_id>

Using the config files

• Check out the Dockerfile, docker-compose.yml, and the index.html.

Build an image from a Dockerfile

$ docker build . -t webserver:v1

• List created Docker images

$ docker images

Run the created image

$ docker run -v $(pwd):/usr/share/nginx/html -d -p 8080:80 webserver:v1

Run with docker-compose

• 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.

$ docker-compose up (-d)

Deleting images and containers

$ docker rmi <image_id>
$ docker rm <container_id>

Happy Dockering! :D