Introduction of Containers

Vitualisation Problems

• guest OS comsume all the resource, where they are pretty much the same

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Containerization

• each container contains less memory
• container only runs the application & environment it needs
• no full OS needed, and able to run much more application in isolation
• portable and lightweight - filesystem layer are shared

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Docker image = container copy

• dockerfiles are used to build images
• images are create from a base image or scatch (barely minimal for a OS)
• layers on the base to generate a differential architecture

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• docker image create docker container, which has additional read-write file system layer
  • different read-write file system layer → made different containers
  • Container Registry (public = docker hub)