Gain insights into Docker, its impact on development, and why it's essential. Learn about creating, deploying, and running applications with containers to enhance your software and career.

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docker-hello

docker-file

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docker-env1

docker-env2

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docker_size

dot-net

node

python

nginx

jenkins

nextCloud

By now, you've probably heard the buzz around Docker. It's fundamentally changed the development process and been adopted by software teams of all sizes, and for good reason: Docker makes it considerably easier to create, deploy, and run applications with the use of containers.

Docker is here to stay, and is becoming one of the most in-demand technologies on the market. Mastering it now will help you produce better software, level up your career, and stand out from the crowd. Get started today.

Docker for Developers

The problem with the image we created above is that it's massive; it's **1730 MB**! This is because it contains the build tools we don't need, tools like *dotnet restore* and *dotnet publish*. Also, it contains the source code and intermediate build artifacts.

We could use the *RUN* command to try and clean the image; delete intermediate build artifacts, uninstall build tools, and delete source code, but that would be tedious. Remember that containers are like cheap, disposable machines; let's dispose of the build machine and grab a brand new one that has only the runtime installed!

Docker has a neat way to do this; use a single *Dockerfile* file with distinct sections. An image can be named simply by adding *AS <name>* at the end of the *FROM* instruction. Consider the following simplified *Dockerfile* file:



In this lesson, we will learn how to handle large images using multi-stage Dockerfiles.

Multi-Stage Dockerfiles

Before Getting Started

Why Docker?

Get Docker up and Running

Basic Concepts

Use Docker Images

Create Docker Images

Publish Docker Images

Forget SDK Installs

Docker with Common Development Profiles

More About Running Containers

Multi-Stage Dockerfiles