Docker is very popular in IT world, software companies are continuously using Dockers for a production environment,

History before Dockers

Before Dockers, Developers have used virtual machines for running applications, but it has few disadvantages such as Virtual Machines are huge in size, it consume more memory for ram, take a lot of time to boot, and slow performance, to solve this problem, Dockers came into picture.

What is Dockers?

Dockers is a platform which bundle an application and all its dependencies all together and placed in a container.

In the above diagram, each application has separate containers, inside the container has the application files and all its dependencies and libraries, this confirms that each application works without any conflicts,

Using Docker a developer can build multiple containers for multiple applications, and they can place all the application dependencies and libraries inside the container, which will ensure that it will work in the testing and production environment.

What is Docker file, Image and Containers?

Dockerfile, Docker Images & Docker Containers are three important things, we need to learn about this before using Dockers.