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#90DaysOfDevOps - What is Docker & Getting installed - Day 43
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90DaysOfDevOps - What is Docker & Getting installed
devops, 90daysofdevops, learning
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What is Docker & Getting installed

In the previous post, I mentioned Docker at least once and that is because Docker is innovative in making containers popular even though they have been around for such a long time.

We are going to be using and explaining docker here but we should also mention the Open Container Initiative (OCI) which is an industry standards organization that encourages innovation while avoiding the danger of vendor lock-in. Thanks to the OCI, we have a choice when choosing a container toolchain, including Docker, CRI-O, Podman, LXC, and others.

Docker is a software framework for building, running, and managing containers. The term "docker" may refer to either the tools (the commands and a daemon) or the Dockerfile file format.

We are going to be using Docker Personal here which is free (for education and learning). This includes all the essentials that we need to cover to get a good foundation of knowledge of containers and tooling.

It is probably worth breaking down some of the "docker" tools that we will be using and what they are used for. The term docker can be referring to the docker project overall, which is a platform for devs and admins to develop, ship and run applications. It might also be a reference to the docker daemon process running on the host which manages images and containers also called Docker Engine.

Docker Engine

Docker Engine is an open-source containerization technology for building and containerizing your applications. Docker Engine acts as a client-server application with:

  • A server with a long-running daemon process dockerd.
  • APIs specify interfaces that programs can use to talk to and instruct the Docker daemon.
  • A command line interface (CLI) client docker.

The above was taken from the official Docker documentation and the specific Docker Engine Overview

Docker Desktop

We have a docker desktop for both Windows and macOS systems. An easy-to-install, lightweight docker development environment. A native OS application that leverages virtualisation capabilities on the host operating system.

It’s the best solution if you want to build, debug, test, package, and ship Dockerized applications on Windows or macOS.

On Windows, we can also take advantage of WSL2 and Microsoft Hyper-V. We will cover some of the WSL2 benefits as we go through.

Because of the integration with hypervisor capabilities on the host operating system docker provides the ability to run your containers with Linux Operating systems.

Docker Compose

Docker compose is a tool that allows you to run more complex apps over multiple containers. With the benefit of being able to use a single file and command to spin up your application.

Docker Hub

A centralised resource for working with Docker and its components. Most commonly known as a registry to host docker images. But there are a lot of additional services here which can be used in part with automation or integrated into GitHub as well as security scanning.

Dockerfile

A dockerfile is a text file that contains commands you would normally execute manually to build a docker image. Docker can build images automatically by reading the instructions we have in our dockerfile.

Installing Docker Desktop

The docker documenation is amazing and if you are only just diving in then you should take a look and have a read-through. We will be using Docker Desktop on Windows with WSL2. I had already run through the installation on the machine we are using here.

Take note before you go ahead and install at the system requirements, Install Docker Desktop on Windows if you are using macOS including the M1-based CPU architecture you can also take a look at Install Docker Desktop on macOS

I will run through the Docker Desktop installation for Windows on another Windows Machine and log the process down below.

Windows

  • Select windows as the operating system of your device.

  • Navigate to the folder where you want to save the installer and save.

  • Run the installer and wait for a few seconds and grant access for WSL.

  • Click ok and the installation will begin.

  • Docker Desktop has been successfully installed on your device. You can now run the command "docker" on the terminal to check if the installation was successfull.

Resources

See you on Day 44