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Core Concepts

1. Docker Hub

Docker Hub is a cloud-based registry where you can store and share container images. It allows you to distribute your applications and collaborate with others. Docker Hub provides both public and private repositories for your images.

2. Container Images

A container image is a lightweight, standalone, and executable package that includes everything needed to run a piece of software. This includes the code, runtime, libraries, and dependencies.

Now that we have our application up and running, next we need to containerise our application as this will be essential for them to communicate with other services that we shall be creating later on iin the course.

Prerequisites

Before proceeding, ensure you have: - Administrative privileges on your machine. - A stable internet connection.

Installing Docker

macOS

  1. Install Docker:
    • Download Docker Desktop for Mac from Docker's official website.
    • Run the installer and follow the on-screen instructions.
    • Verify installation:
      docker --version
  2. Install Kubernetes:
    • Kubernetes is included with Docker Desktop. Enable Kubernetes in Docker Desktop settings.
    • Verify installation:
      kubectl version --client

Windows

  1. Install Docker:
    • Download Docker Desktop for Windows from Docker's official website.
    • Ensure WSL 2 is enabled (required for Docker Desktop).
    • Run the installer and follow the on-screen instructions.
    • Verify installation:
      docker --version
  2. Install Kubernetes:
    • Kubernetes is included with Docker Desktop. Enable Kubernetes in Docker Desktop settings.
    • Verify installation:
      kubectl version --client

Linux

  1. Install Docker:
    • Follow the official Docker Engine installation guide for your Linux distribution: Docker Linux Install.
    • Start and enable the Docker service: 
      sudo systemctl start docker
sudo systemctl enable docker
    • Verify installation:
      docker --version
  2. Install Kubernetes:
    • Install kubectl using the official guide: Install kubectl.
    • Optionally, install Minikube for a local Kubernetes cluster: Install Minikube.
    • Verify installation:
      kubectl version --client

Testing docker installation

We can test to see if docker has been installed using the commanf bellow

docker run hello-world
To also test Kubernetes, which we shall alter use in the course, we can do this by deploying a sample application:

kubectl create deployment hello-node --image=k8s.gcr.io/echoserver:1.4
kubectl expose deployment hello-node --type=LoadBalancer --port=8080

Later on in the course we shall learn and apply more about kubernettes. for now lets focus on docker.

Since we have our app up and running, we should be thingking of deploying this application. We shall use docker to make this happen.

Now that you’ve built your Docker image, you’re ready to publish it to Docker Hub. This guide will walk you through the steps required to share your image with others.

Dockerising auth service

Dockerise here