Docker is possibly the most popular solution to have all your services run in a container. Containers allow us to run and develop an application in the same environment, regardless of what machine you’re on.
Containers are a standardized unit of software that allows developers to isolate their app from its environment, solving the “it works on my machine” headache.
What is a Docker Container?
Containers are an abstraction at the app layer that packages code and dependencies together. Multiple containers can run on the same machine and share the OS kernel with other containers.
When you deploy an application you have to install all the dependencies (MySQL, Node, Redis) on the host system. With Docker, instead of managing host systems, you just specify a Docker file that lists all the dependencies for the project.
Docker builds an image out of all of those dependencies which we can re-use over multiple computers. Docker users can store images in private or public repositories, and from there can then deploy containers, test images, and share them.
Think of Docker applications as tiny containers, which have their own filesystem and dedicated RAM, but a shared kernel with the host operating system.
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