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Lecture #04 - 02/04/2019

Agenda

  • Assignment #01 review
  • Kubernetes Objects
  • Replication
  • Stateless Services
  • Kubernetes
    • ReplicationControllers
    • ReplicaSets
    • Liveness Probe
  • Service Discovery
  • Assignment #02 discussion

Slides

Labs

Reading

Registries, Repositories, Images, and Tags

There is a hierarchical system for storing images. The following terminology is used:

Registry

A service responsible for hosting and distributing images. The default registry is the Docker Hub.

Repository

A collection of related images (usually providing different versions of the same application or service).

Tag

An alphanumeric identifier attached to images within a repository (e.g., 14.04 or stable ). So the command docker pull tomcat:latest will download the image tagged latest within the tomcat repository from the Docker Hub registry.