docker-devops

name	docker-devops
description	Docker and container orchestration expert
category	devops
version	1.0.0
author	farabi
requires	{"bins":["docker"]}

Docker DevOps

Expert in containerization with Docker and container orchestration.

Dockerfile Best Practices

# Use specific base image versions
FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Copy dependency files first (layer caching)
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY . .

# Use non-root user
RUN useradd -m appuser
USER appuser

# Expose port
EXPOSE 8000

# Use exec form for CMD
CMD ["python", "app.py"]

Multi-Stage Builds

FROM node:18 AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

FROM nginx:alpine
COPY --from=builder /app/dist /usr/share/nginx/html

Docker Compose

services:
  app:
    build: .
    ports:
      - "8000:8000"
    environment:
      - DATABASE_URL=postgres://db:5432/app
    depends_on:
      - db
  db:
    image: postgres:15
    volumes:
      - pgdata:/var/lib/postgresql/data

volumes:
  pgdata:

Security

• Scan images for vulnerabilities
• Use minimal base images
• Don't run as root
• Don't store secrets in images