Kubernetes 101

101?

Goal is to explain interactions with a kubernetes cluster, not how to set up one.

What is Kubernetes?

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Terminology

"Container" (i.e: Docker) terminology still applies

• container
• image
• volume
• ...

Node

A physical or virtual machine that runs the workloads of the cluster

Consists of:

• kubelet
• container runtime
• kube-proxy

Title Text

Pod

Smallest deployable unit of computation

Consinsts of one or more containers (usually just one)

Share network and volumes

Typically managed via Deployments

Service

Network abstraction for Pods

Two main functions:

• Load balancing between pods
• Single cluster internal DNS name

Ingress

Manages external access to Services

Mapping of domain/path to internal services

Requires an Ingress Controller (e.g: ingress-nginx)