What is Docker?
Docker is a tool designed to make it easier to create,
deploy, and run applications by using containers. Containers allow a developer
to package up an application with all of the parts it needs, such as libraries
and other dependencies, and ship it all out as one package. By doing so, thanks
to the container, the developer can rest assured that the application will run
on any other Linux machine regardless of any customized settings that machine
might have that could differ from the machine used for writing and testing the
code.
In a way, Docker is a bit like a virtual machine. But unlike
a virtual machine, rather than creating a whole virtual operating system,
Docker allows applications to use the same Linux kernel as the system that
they're running on and only requires applications be shipped with things not
already running on the host computer. This gives a significant performance
boost and reduces the size of the application.
And importantly, Docker is open source. This means that
anyone can contribute to Docker and extend it to meet their own needs if they
need additional features that aren't available out of the box.
Who is Docker for?
Docker is a tool that is designed to benefit both developers
and system administrators, making it a part of many DevOps (developers +
operations) toolchains. For developers, it means that they can focus on writing
code without worrying about the system that it will ultimately be running on.
It also allows them to get a head start by using one of thousands of programs
already designed to run in a Docker container as a part of their application.
For operations staff, Docker gives flexibility and potentially reduces the
number of systems needed because of its small footprint and lower overhead.
Getting started
Here are some resources that will help you get started using
Docker in your workflow. Docker provides a web-based tutorial with a
command-line simulator that you can try out basic Docker commands with and
begin to understand how it works. There is also a beginners guide to Docker
that introduces you to some basic commands and container terminology. Or watch
the video below for a more in-depth look:
Docker and security
Docker brings security to applications running in a shared
environment, but containers by themselves are not an alternative to taking
proper security measures.
Dan Walsh, a computer security leader best known for his
work on SELinux, gives his perspective on the importance of making sure Docker
containers are secure. He also provides a detailed breakdown of security
features currently within Docker, and how they
function[Source]-https://opensource.com/resources/what-docker
Beginners & Advanced level Docker Container Training in Mumbai. Asterix
Solution's 25 Hour Docker Training gives broad hands-on practicals.
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