Basic Idea about Docker

Basic Idea:

What is host machine?

A hypervisor or virtual machine monitor (VMM) is a piece of computer software, firmware or hardware that creates and runs virtual machines. A computer on which a hypervisor is running one or more virtualmachines is defined as a host machine. Each virtual machine is called a guest machine.

What is the need for creating registry?

Port configurations.

Docker is a tool:

solve problems  like:

installing ,removing,upgrading,distribuing,trusting,managingsoftware

Docker is a command line program,a background Daemon and a set of remote services that take a lot of logistical approach to solving common software problems and simplifying your experience.

It accomplishes this using a UNIX technology called containers.

Any software run with  docker is run inside the container,with  Docker,users get containers at a much lower cost .

Programs running inside Docker containers interface directly with  the hosts linux kernel.

Docker uses linux namespaces and groups,which have been part of linux since 2007.Docker doesn’t provide container technology,but it is specifically  makes it simpler to use.

Docker means running two programs in user space :

First is the Docker daemon

second is Docker CLI.

This is the  Docker program that users interact with.If you want to start,stop or install software,you will issue a command using the Docker program.