Docker Cookbook

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• List all images ?

docker images

• List all containers ?

docker container ls -a / docker ps -a

• List all containers belong to a particular image ?

docker ps --all --filter ancestor=<image_name_or_id>

• See all the envs passed to a container used during creating it. ?

docker container inspect <container id>

• Run the docker in detached mode

docker run -d

• Docker: publish port 5004 of container to 8000 of host

docker run -p 8000:5004 <image>

• See the logs of the docker when the docker runs in a detached mode ?

docker logs -f <container-id>

• Close the container by giving time to close all the operations inside it ?

docker stop <container-id>

• Kill all the container and all the operations inside the container ?

docker container kill <container-id>

• How do you see all the docker events happening in a system ?

docker system events

• See the statistics of a container

docker stats <container-id>

• How do you transmit stdin, stdout of the container to the terminal ?

docker attach <container-id>

• What to give as a additional parameter such that the previous step container is not stopped ?

If the container started with -d or -i then Ctrl C

Dockerfile for a simple flask/python application ?

FROM python:3.8-slim-buster WORKDIR /backend ARG URL ENV ENVIRONMENT=""COPY ./service/requirements.txt /backend/service/requirements.txt RUN pip install --no-cache-dir --upgrade -r /backend/service/requirements.txt COPY ./service /backend/serviceEXPOSE 8080CMD ["uvicorn", "service.app:app", "--host", "0.0.0.0", "--port", "8080"]

• Clean up

docker kill $(docker ps -q)docker rm $(docker ps -a -q)docker rmi $(docker images -q)

• Conditional Logic in Docker Build

FROM node:alpineRUN mkdir -p /usr/src/appWORKDIR /usr/src/appCOPY package.json /usr/src/app/RUN npm installCOPY . /usr/src/appENV PORT 3000ARG DOCKER_ENVENV NODE_ENV=${DOCKER_ENV}RUN if [ "$DOCKER_ENV" = "stag" ] ; then  echo   your NODE_ENV for stage is $NODE_ENV;  \else  echo your NODE_ENV for dev is $NODE_ENV; \fi

• when you build this Dockerfile with this command

docker build –build-arg DOCKER_ENV=stag -t test-node . You will see at layer

—> Running in a6231eca4d0b your NODE_ENV for stage is stag When you run this docker container and run this command your output will be

/usr/src/app # echo $NODE_ENVstag

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