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Docker Commands

  • docker build -t repoName/image-1:version . or -f Dockefile-1
  • docker pull | push | login

image

  • docker images
  • docker rmi image-1
  • docker tag image-id-1 name:version/latest

Container

common

  • docker run
  • your-command (optional, eg sleep 5000)
  • --name = container-name - c1
  • -it
  • -d
  • -v
  • --mount type=volume, source=vol-1, target=location-on-container
  • -e k=v -e k=v ...
  • -p host:container
  • --network = n1
  • --user 100
  • --cap-add/drop CAPABILITY-1 --cap-add/drop CAPABILITY-2 ...
  • --entrypoint python app-1.py --> override ENTRYPOINT ["python", "app-1.py"]

  • registry-1/repoName-1/image-1:latest 👈 image at last

  • docker ps -a

  • docker start | stop | restart c1
  • docker rm c1
  • docker exec c1
  • docker logs -f c1 : live log trail
  • docker inspect nspect a container's network configuration

volume and network

  • docker volume create vol-name-1:location-on-host
  • docker network create --driver=bridge --subnet ... n1

dockerfile (text file)

  • FROM : Specifies the base image
  • ENDPOINT :
  • Specifies the primary command to run inside the container
  • always executed when the container starts
  • any arguments provided to docker run will be appended to the command defined in ENTRYPOINT
  • ENTRYPOINT ["python", "app-1.py"] : no argument
  • CMD
  • Purpose: Provides default arguments for the command specified in ENTRYPOINT
  • ENTRYPOINT ["python"] + CMD ["app-2.py"]
  • CMD ["python", "app-1.py"] --> will also work
  • RUN
  • RUN apt-get update && apt-get install -y curl
  • RUN pip install
  • ADD
  • WORKDIR
  • EXPOSE 8080
  • COPY
  • ENV NODE_ENV=production
  • ARG APP_VERSION=1.0 , Defines build-time variables
  • VOLUME /data
  • USER userId
  • by default all process run the root user (with limited set of capability)

### apk ###

apk update
apk add --no-cache package-name (eg: curl)
apk del package-name
apk search package-name
apk info

# Combine apk commands into one block to reduce image layers and improve build performance.
# Use --no-cache to avoid storing index files and temporary data in the final image
# rm -rf /var/cache/apk
- Reduce size of image: - Multi-stage builds - Alpine-based images - remove unnecessary dependencies. - docker scan