Krishiv Piduri

Docker compose and other IaC (Infrastructure as Code) tools are very important to learn. Today, they are almost essential knowledge to manage any sort of infrastructure, anywhere. Docker Compose is one of the most prominent tools in this space. According to Stackshare, at the time of writing, there are about 2108 companies using docker compose in their tech stack. This includes giant companies like Udemy. The knowledge of this relatively simple tool is very important. That is why I am going to break it down for you here. What is Docker Compose As mentioned before, Docker Compose is an IaC tool for Docker containers. It makes it significantly easier to deploy and manage containers in an environment with several containers. Why Docker Compose Now that you know what docker compose is, let's talk about why somebody would need such a tool. What benefits does it provide? Simplifies Deployment: Docker compose simplifies deployment. Once you have the IaC template in place, you can deploy a

In a world where it is not uncommon for companies to have millions of containers, simply managing them through the docker CLI will not suffice. We need a tool that can help us manage chunks of containers and define them in a human-readable format. That is exactly what docker compose does. Basics At the most basic level, docker compose uses code to manage your infrastructure. This code is written in yaml format. The file that the code is written in is called docker-compose.yaml . Here is a basic docker-compose.yaml file: version : ' 3.8 ' services : service1 : image : nginx:alpine ports : - " 80:80 " service2 : image : alpine networks : mynetwork : As you can see, the structure of the file is quite basic. Let's go through everything 1 by 1. version : This specifies the version of docker compose in use by the file. services : This specifies the services that the file defines. Each service is, essentially, just the definition for a con