Docker & AKS workshop

Module 1: Set up your Docker environment

Concepts

Docker is a platform for deveopers and sysadmins to develop, deploy and run applications with containers.

Images and containers

A container is lauched by running an image. An image is an executable package that includes everything needed to run an application--the code, a runtime, libraries, environment variables, and configuration files.

A container is a runtime instance of an image

Containers and virtual machines

A container runs natively on Linux and shares the kernel of the host machine with other containers

A virtual machine runs an OS with virtual access to host resources through a hypervisor.

Prepare environment

Connect to Ubuntu VM

$ ssh workshop@workshop-vm-[x].eastasia.cloudapp.azure.com -i ./ssh-key/id_rsa

Get Docker engine - Ubuntu

  1. Update the apt package index
$ sudo apt-get update
  1. Install packages to allow apt to use a repository over HTTPS
$ sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common
  1. Add Docker’s official GPG key
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
  1. Setup the stable repository
$ sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
  1. Install the latest version of Docker Engine
$ sudo apt-get update

$ sudo apt-get install docker-ce docker-ce-cli containerd.io

Test Docker

  1. Run docker --version
$ docker --version

Docker version 19.03.1, build 74b1e89
  1. Run docker info
$ sudo docker info

Client:
 Debug Mode: false

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 19.03.1
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 ...

Notes: If you don't want to type sudo before each command, type sudo bash or sudo su.

Test Docker installation

  1. Test installation works by running the following
$ sudo docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:451ce787d12369c5df2a32c85e5a03d52cbcef6eb3586dd03075f3034f10adcd
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.
...
  1. List docker image that was downloaded
$ sudo docker image ls

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              fce289e99eb9        8 months ago        1.84kB
  1. List all containers
$ sudo docker ps -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
8ee2c33c10ab        hello-world         "/hello"            2 minutes ago       Exited (0) 2 minutes ago                       keen_wilson

← Play with Ubuntu image →