Target Reader
This article is written for backend engineers and DevOps engineers who build, deploy, and maintain services, whether for personal projects, startups, or production systems.
Goal / Takeaway
By the end of this article, you should clearly understand what Docker is, why it exists, what images and containers are, how they differ from virtual machines, the Docker commands you will actually use, when Docker Compose becomes necessary, and how Docker fits into real day to day engineering work.
Before we begin, I just want you to know that, this article is open to everyone, even if you are not a member, you can actually read it for free! Yep i said free! click this link. Don't let the paywall stop your learning :)
Why Docker Exists
Let’s be honest. Before Docker, shipping software was pain. Real pain like bro real pain o, I'm telling you fact’s :(
Your app works fine on your laptop. You push it to another machine and suddenly nothing works. Wrong Node version. Missing system libraries. Environment variables not set. Someone says it works on their system and you are left wondering what kind of system that even is. Besides this, imagine you have like 3 microservices, bro, deployment can be time consuming man :(
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