Introduction

What is Docker?

• is lightweight wrapper around single Unit process

• is managed through console or API

• is cheap to start and stop, unlike virtual machines

• containers are made of stacked filesystem layers, each layer is place on top of previous changes

• is build layer by layer, if layer is not changed the rebuild operation is thus fasterlp

• takes very little disk space, because it is just reference to layered filesystem image and configurations

• each container has ists own IP address and talk to each other, thanks to Docker server network settings

• is by design for stateless application, where state is externalized to database or external storage

• immutable containers

• small container because it is just reference to layered file system image and some configuration data

• containers run in limited isolation, they can share resources

References to used materials:

• Docker documentation

• Docker for DevOps: From Development to Production by Stone River eLearning