Kubernetes Platform - kimschles/schlesinger-knowledge GitHub Wiki

Kubernetes is a Platform Platform

_ Joe Beda, CTO Heptio_

Gluecon: May 16, 2018

What is Kubernetes?

• A container orchestrator

  • Putting containers on machines and getting them to talk to each other

• Benefits

  • an improved workflow (easier!)
  • increased utilization

• A DB with a policy-layer in front of it.

• A distributed db platform

Controllers

• Declarative configuration. 2 parts:
  • Spec (the user intent)
  • Status (how are we doing with the rules in the spec?)

Watch

• The process of using Kubernetes is less like an orchestra and more like jazz improv

Layering

• The most primitive thing is a pod
• ReplicaSet
  • Creates several pods that are a clone of the original so that there is a replacement when something fails
• Deployment
  • Manages a set of replica sets
• Job
• CronJob
• Custom Resource Definitions
  • Extend schema and create new objects
  • Compliments the replicaset
• Operators
  • A domain specific controller
  • For example: run mySQL on top of a pod
• Metacontroller

Concepts to Research:

• etcd
• cronjob
• failover
• blue/green deployment
  • running 2 production enviornments. Only one is used at a time