Deploying Go Services to Docker & Kubernetes

Dockerfile (multi‑stage)

This lesson explains the main concept clearly with beginner-friendly examples and background so you can learn why the code works.

# Build stage
FROM golang:1.22-alpine AS builder
WORKDIR /src
COPY . .
RUN CGO_ENABLED=0 go build -o /app ./cmd/app

# Runtime stage
FROM alpine:latest
RUN addgroup -S app && adduser -S -G app app
USER app
COPY --from=builder /app /app
ENTRYPOINT ["/app"]

Kubernetes Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: go-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: go-app
  template:
    metadata:
      labels:
        app: go-app
    spec:
      containers:
      - name: go-app
        image: ghcr.io/yourname/go-app:latest
        ports:
        - containerPort: 8080

Create a Service (NodePort or LoadBalancer) to expose the app.