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 deploy it 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) tool-chains. 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.
Competitors in Container Management & Container Orchestration
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