Devops Workshop-2 Docker

One Day workshop on understanding Docker and Containers. Learn to run a container, inspect a container and understand the isolation of processes. Create a Dockerfile, and build an image from a Dockerfile. Learn how to mount application code using volume mount. Learn how to make your app data persistent across multiple containers. Learn how to create multiple containers from a single image, run multiple containers using docker-compose, and more.

Prerequisites

• Machine/VM with ubuntu 22.04
• Docker
• DockerHub Account
• Git
  • Create github account
  • Setting up SSH key with GitHub for Ubuntu
• VS code IDE
• Stable Internet Connection and any browser.

Workshop environment setup

• Check if Git, Docker, and Docker Compose are installed in on the system. Open the terminal and run the following command

  $ git --version
  git version 2.25.1
  
  $ docker --version
  Docker version 20.10.17, build 100c701
  
  $ docker compose version
  Docker Compose version v2.6.0
  

• Open terminal and run following command to create a folder called workshop

  $ mkdir workshop

• Navigate to the folder workshop and clone the from your personal repo using git

  $ cd workshop

• Clone DevOps-Workshop2 repo && go inside DevOps-Workshop2 folder

  $ git clone [email protected]:UniCourt/DevOps-Workshop2.git
  $ cd DevOps-Workshop2

• To open folder in VS code editor

  $ cd ~/workshop/DevOps-Workshop2
  $ code .

Install Docker

• If docker is not installed in your Linux run the following command

  $ sudo apt-get update
  $ sudo apt-get install -y curl 
  $ curl -fsSL https://get.docker.com -o get-docker.sh
  $ sudo sh get-docker.sh

• Do docker login

  $ sudo docker login -u username --password-stdin
  or
  $ sudo docker login -u username

Docker without sudo

• To run docker commands as normal user without sudo, we need to create a group for docker and add the user to it.

1. Create the docker group

   $ sudo groupadd docker

2. Add your user to docker group

   $ sudo usermod -aG docker $USER

3. Activate the changes to groups:

   $ newgrp docker

4. Verify that you can run docker commands without sudo.

   $ docker images
   or
   $ docker image ls

What will you learn by the end of this workshop?

• By the end of this workshop, you will learn what docker is and understand how to set up containers.
• You will be introduced to containerization concepts and why it is required.
• You will learn how to build and run your own Containers.
• You will learn how to run Multiple Services with Docker Compose.

Schedule

Time	Topics
09:00 - 09:30	What is Docker? Why Docker?
09:45 - 10:00	Simple Docker Commands
10:00 - 10:45	Writing a Dockerfile
10:45 - 11:30	Creating Our application
11:30 - 12:00	Updating and sharing the App
12:00 - 01:00	Persisting our DB and Bind Mounts
01:00 - 02:00	[Break]
02:00 - 03:30	Multi-Container Apps
03:00 - 04:00	Using Docker Compose
04:00 - 05:00	Image Building Best Practices
05:00 - 05:15	[Q & A]
05:15 - 05:30	[Wrapping Up]