Docker for Microservices
Docker, EK, microservice, ko, USKI, SAARI, dependencies, ke, saath, EK, CONTAINER, mein, PACKAGE, karta hai — "it, works, on, my, machine" problem, SOLVE, karta hai, kyunki, CONTAINER, HAR, ENVIRONMENT, mein, SAME, tareeke, se, RUN, hota hai.
HAR, MICROSERVICE, apni, ALAG, Docker, IMAGE, RAKHТА, hai — INDEPENDENTLY, BUILD, DEPLOY, aur, SCALE, ki, ja, sakti hai, JO, microservices, ke, "independent, deployability" principle, ko, PERFECTLY, MATCH, karta hai.
# order-service/Dockerfile:
FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --production
COPY . .
CMD ["node", "server.js"]
# Build aur run:
# docker build -t order-service .
# docker run -p 3000:3000 order-service- Docker = har, service, apni, dependencies, ke, saath, ek, container, mein
- "It works on my machine" problem, solve, karta, hai
- Har microservice, apni, ALAG, image — independently, deployable/scalable
Multi-stage, builds, se, EK, SMALLER, PRODUCTION, image, banaya, ja, sakta hai — BUILD, TOOLS, (jaise, compilers) EK, "BUILD, STAGE" mein, USE, hote, HAIN, LEKIN, FINAL, image, mein, SIRF, COMPILED, output, hi, INCLUDE, hota hai.
# Stage 1: build
FROM node:20 AS builder
RUN npm run build
# Stage 2: production (SMALLER, image)
FROM node:20-alpine
COPY --from=builder /app/dist ./distDocker, images, EK, "REGISTRY" (jaise, Docker, Hub, AWS, ECR, Google, Container, Registry) mein, PUSH, ki, jaati, HAIN — orchestrators, (jaise, Kubernetes) YAHA, se, images, PULL, karke, CONTAINERS, RUN, karte, hain.