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DOCKER - Coggle Diagram

- - - - Like a .jar or .zip file
      - Compiled code + environment config
      - Includes app, services (node/npm), OS layer (Linux)
      - Immutable artifact
    - - Running instance of an image
      - Multiple containers can run from one image
      - Has its own virtual file system
      - Has its own network port
    - - docker images - list local images
      - docker ps - list running containers
      - docker ps -a - list all containers
  - - - Dev writes Dockerfile
      - CI server builds image and pushes to registry
      - Ops pulls and runs container
- - - - FROM - base image (e.g. FROM node:19-alpine)
      - COPY - copy files from host to container
      - WORKDIR - set working directory inside container
      - RUN - execute Linux commands during build
      - CMD - default command when container starts
      - ENV - set environment variables
      - EXPOSE - document which port app listens on
    - - FROM node:19-alpine
      - COPY package.json /app/
      - COPY src /app/
      - WORKDIR /app
      - RUN npm install
      - CMD [node server.js]
- - - - Uses docker-compose.yaml (YAML format)
      - Replaces multiple docker run commands with one file
      - Tool for defining and running multi-container apps
    - - version - compose file version
      - services - list of containers to run
      - image - image to use for each service
      - ports - port mappings HOST:CONTAINER
      - environment - env variables
      - depends_on - startup order dependency
      - networks - auto-created by default
    - - docker-compose -f file.yaml up - start all services
      - docker-compose -f file.yaml up -d - detached mode
      - docker-compose -f file.yaml down - stop and remove all
      - docker-compose -f file.yaml start/stop - no remove
    - - Two services: mongodb and mongo-express
      - mongo-express depends_on mongodb
      - Network auto-created by Docker Compose
      - Access UI at localhost:8081
    - - No auto-scaling
      - Single host only
      - No self-healing
      - Use Kubernetes for production orchestration
  - - - Named volumes - managed by Docker
      - Bind mounts - map host directory to container
      - Anonymous volumes - temporary