Introduction to Docker

Docker - What is Docker?

Lets understand docker and why is it so important in today's  world.
Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker, you can manage your infrastructure in the same ways you manage your applications. By taking advantage of Docker’s methodologies for shipping, testing, and deploying code quickly, you can significantly reduce the delay between writing code and running it in production.

The Docker platform

Docker provides the ability to package and run an application in a loosely isolated environment called a container. The isolation and security allow you to run many containers simultaneously on a given host. Containers are lightweight because they don’t need the extra load of a hyper-visor, but run directly within the host machine’s kernel. This means you can run more containers on a given hardware combination than if you were using virtual machines. You can even run Docker containers within host machines that are actually virtual machines!
Basically to run a docker on any given machine it needs a base kernal(Linux).
  1. Docker provides tooling and a platform to manage the lifecycle of your containers:
  2. Develop your application and its supporting components using containers.
  3. The container becomes the unit for distributing and testing your application.
  4. When you’re ready, deploy your application into your production environment, as a container or an orchestrated service. This works the same whether your production environment is a local data center, a cloud provider, or a hybrid of the two.

Docker can be run on any machine be it Windows, Mac and of course Linux. There are types of docker CE and EE.
1. CE (Community Edition)
Docker Community Edition (CE) is ideal for developers and small teams looking to get started with Docker and experimenting with container-based apps. Docker CE has three types of update channels, stable, test, and nightly:
  • Stable gives you latest releases for general availability.
  • Test gives pre-releases that are ready for testing before general availability.
  • Nightly gives you latest builds of work in progress for the next major release.

2. EE (Enterprise Edition)
Docker Enterprise Edition (Docker EE) is designed for enterprise development and IT teams who build, ship, and run business-critical applications in production and at scale. Docker EE is integrated, certified, and supported to provide enterprises with the most secure container platform in the industry.
There are currently two versions of Docker EE Engine available:
  • 18.03 - Use this version if you’re only running Docker EE Engine.
  • 17.06 - Use this version if you’re using Docker Enterprise Edition 2.0 (Docker Engine, UCP, and DTR).



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