What is a Docker?

Docker is a platform for developers and sysadmins to develop, deploy, and run applications with containers. The use of Linux containers to deploy applications is called containerization. Containers are not new, but their use for easily deploying applications is.

Containerization is increasingly popular because containers are:

• Flexible: Even the most complex applications can be containerized.

• Lightweight: Containers leverage and share the host kernel.

• Interchangeable: You can deploy updates and upgrades on-the-fly.

• Portable: You can build locally, deploy to the cloud, and run anywhere.

• Scalable: You can increase and automatically distribute container replicas.

• Stackable: You can stack services vertically and on-the-fly.

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