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Docker Best Practices for Production Applications

Docker Best Practices for Production Applications

Containerization has revolutionized how we deploy applications. Here are the key practices I’ve learned for running Docker in production.

Multi-Stage Builds

Reduce your image size significantly:

# Build stage
FROM golang:1.21 AS builder
WORKDIR /app
COPY . .
RUN CGO_ENABLED=0 go build -o main

# Production stage
FROM alpine:latest
COPY --from=builder /app/main /main
CMD ["/main"]

Security First

  1. Don’t run as root: Use a specific user
  2. Scan images: Regular vulnerability scanning
  3. Minimal base images: Alpine or distroless

Resource Limits

Always define resource constraints:

resources:
  limits:
    memory: 256M
    cpus: "0.5"

Health Checks

Add proper health checks:

HEALTHCHECK --interval=30s --timeout=3s \
  CMD curl -f http://localhost:8080/health || exit 1

Logging Strategy

Centralize your logs with:

  • ELK Stack
  • Loki
  • CloudWatch

Docker Compose for local development, Kubernetes for production—that’s the practical approach for most teams.

Remember: Containers should be ephemeral. Design your application to handle restarts gracefully.