Docker and Kubernetes
Introduction
Containers
This all started with VMWare where the total resource could be divided up to run more than one application on difference virtual machines. But VMWare required an OS on every machine and licenses in the case of Windows. They also needed managing, e.g. patching, Anti-virus and patching. Along came containers which shared the OS.
Docker
Docker Inc. Docker is a company which gave the word technology for containers. They are now a company which provides services around the company.
Docker is Open source and known as Community Edition (CE). The company Docker releases an Enterprise Edition (EE).
The general approach is to
- Create an image (docker build)
- Store it in a registry (docker image push)
- Start a container from it (docker container run)
The differences between EE and CE are shown below
Kubernetes
Kubernetes came out of Google and Open Source. Greek for helmsman or k8s (Kates). Kubernetes is an orchestrator and can schedule, scale and update containers.
