Docker – From Zero to Prod

Containers share the host kernel and are lightweight compared to VMs.

docker build -t myapp:1 .
docker pull node:20-alpine
docker push user/myapp:1

build creates an image from a Dockerfile. pull/push download/upload images to a registry.

docker run -d --name web -p 8080:80 nginx:alpine
docker ps -a
docker exec -it web sh

run starts a container; -p publishes ports; ps lists containers; exec opens an interactive shell.

docker volume create data
docker network create app-net
docker run -d --name db --network app-net -v data:/var/lib/mysql mysql:8

volume persists data; network isolates communication; mounting a volume keeps DB state across restarts.

FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["node", "server.js"]

services:
  web:
    build: .
    ports: ["3000:3000"]
    depends_on: [db]
  db:
    image: mongo:6
    volumes: ["dbdata:/data/db"]
volumes:
  dbdata: {}

Build a Node.js API coupled with MongoDB using the provided Compose file. Implement CRUD endpoints and persist data via the volume.