Kubernetes Fundamentals for Developers

Sun, 18 Apr 2021 00:00:00 +0000

Kubernetes orchestrates containers at scale. Full stack developers do not need to be cluster admins, but understanding Pods, Deployments, and Services helps you debug production issues.

Core Objects

Pod: One or more containers that share networking and storage.
Deployment: Declarative updates for Pods (replicas, rolling updates).
Service: Stable network endpoint to reach Pods (ClusterIP, LoadBalancer).

A Minimal Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: api
spec:
  replicas: 3
  selector:
    matchLabels:
      app: api
  template:
    metadata:
      labels:
        app: api
    spec:
      containers:
        - name: api
          image: myregistry/api:1.2.0
          ports:
            - containerPort: 3000

Local Development

Use minikube or kind to run clusters locally. Skaffold and Tilt sync code into running Pods for faster iteration.

Kubernetes on David Lang

Kubernetes Fundamentals for Developers

Core Objects

A Minimal Deployment

Local Development