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Docker Cheat Sheet

  • include docker and docker compose quick reference
  • cover most useful commands

Docker​

Test image busybox​

Famous busybox image that provide many common UNIX utilities for testing.

docker run -it --rm --privileged busybox sh

Find the IP address of Docker container​

docker inspect \
    -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' \
    nfs

Delete all containers(include all status of running, stopped, created)​

docker rm -f $(docker ps -a -q)

Delete the container by image name​

docker rm -f $(docker ps -a -q  --filter ancestor=<image name here!>)
drmi() { docker rm -f $(docker ps -a | awk -v i="^$1.*" '{if($2~i){print$1}}'); }

Delete all volumes​

docker volume rm $(docker volume ls -q)

Keep container running for for testing and debugging​

# Use -t(-tty)
docker run --rm -d -t busybox
docker run --rm -d busybox tail -f /dev/null
docker run --rm -d busybox sleep infinity

Docker Compose​

Check docker-compose.yml rendering​

docker compose --env-file .env --env-file .prod.env config

Rebuild image and restart a service which you specified​

docker-compose up --no-deps web-app -d

Remove a service​

docker-compose rm -s -v web-auth

env_file in docker-compose.yml​

  • env_file equals environment functions.
  • If you use both the env_file and environment attribute, environment variables set by environment take precedence.
  • env_file not used for variables substitution in docker-compose.yml file
  • env_file is not the same as --env-file used in docker-compose --env-file cli.
    • --env-file .env.prod will be used for interpolation for docker-compose.yml file.

Variables resolved from env_file but not taking effect in docker-compose.yaml

docker compose --env-file .env --env-file .prod.env up -d

Exclude sub folders when mounting a local folder​

It's very useful when developing a node project. That will help only mount the local source codes while excluding the local node_modules folder only in the container.

version: "3"
services:
  node:
    image: "node:16"
    working_dir: /home/node/app
    volumes:
      - ./:/home/node/app
      - /home/node/app/node_modules
    expose:
      - "8081"
    command: "npm start"

Dockerfile​

Download from GitHub release using wget​

tgz

RUN GH_USER=REPLACE_WITH_USER \
    GH_REPO=REPLACE_WITH_REPO \
    GH_BRANCH=REPLACE_WITH_BRANCH \
    wget https://github.com/${GH_USER}/${GH_REPO}/archive/refs/tags/${GH_BRANCH}.tar.gz -O "${GH_REPO}-${GH_BRANCH}.tar.gz" \
    && tar -xzvf ./"${GH_REPO}-${GH_BRANCH}.tar.gz" \
    && rm ./"${GH_REPO}-${GH_BRANCH}.tar.gz"

zip

RUN GH_USER=REPLACE_WITH_USER \
    GH_REPO=REPLACE_WITH_REPO \
    GH_BRANCH=REPLACE_WITH_BRANCH \
    wget https://github.com/${GH_USER}/${GH_REPO}/archive/refs/tags/${GH_BRANCH}.zip \
    -O "${GH_REPO}-${GH_BRANCH}.zip" && \ 
    unzip ./"${GH_REPO}-${GH_BRANCH}.zip" && \
    rm ./"${GH_REPO}-${GH_BRANCH}.zip"

Download from GitHub release using curl​

curl -L https://github.com/yarnpkg/yarn/releases/download/v0.23.4/ya‌​rn-v0.23.4.tar.gz > yarn.tar.gz