1            What is Docker?

an open-source project that automates the deployment of software applications inside containersby providing an additional layer of abstraction and automation of OSlevel virtualization on Linux.

Wow! That's a mouthful. In simpler words, Docker is a tool that allows developers, sys-admins etc. to easily deploy their applications in a sandbox (called containers) to run on the host operating system i.e. Linux. The key benefit of Docker is that it allows users to package an application with all of its dependencies into a standardized unit for software development. Unlike virtual machines, containers do not have the high overhead and hence enable more efficient usage of the underlying system and resources.

2            What are containers?

The industry standard today is to use Virtual Machines (VMs) to run software applications. VMs run applications inside a guest Operating System, which runs on virtual hardware powered by the server’s host OS.

VMs are great at providing full process isolation for applications: there are very few ways a problem in the host operating system can affect the software running in the guest operating system, and vice-versa. But this isolation comes at great cost — the computational overhead spent virtualizing hardware for a guest OS to use is substantial.

Containers take a different approach: by leveraging the low-level mechanics of the host operating system, containers provide most of the isolation of virtual machines at a fraction of the computing power.

Install the docker in Linux

 




Note:

If you are unable to install the Docker in EC2 server please follow the below steps

Step: 1 sudo yum install yum-utils
Step: 2 sudo yum-config-manager --enable rhui-REGION-rhel-server-extras
Step: 3: sudo yum install docker

Check the version of Docker installed on the Linux:

CMD: docker –version

Check the Docker commands by using help:

CMD: docker –help