The Ultimate Docker Cheat Sheet

docker_cheatsheet

A cheatsheet is a concise summary of important information that is meant to be used as a quick reference. Cheatsheets are often used in the form of a list or a table, and they typically cover a specific topic or subject area. In the context of Docker, a Docker cheatsheet is a summary of commonly used Docker commands and their options, as well as other useful information related to Docker.

Cheatsheets can be particularly helpful when learning a new tool or technology, as they provide a convenient way to quickly look up and remind oneself of key concepts and commands. They can also be useful for experienced users who need to recall a specific command or option but may not remember all the details.

Table of Contents

Basic Docker CLIs

Here’s the list of the basic Docker commands that works on both Docker Desktop as well as Docker Engine:

full



Container Management CLIs

Here’s the list of the Docker commands that manages Docker images and containers flawlessly:


container_management

Inspecting The Container

Here’s the list of the basic Docker commands that helps you inspect the containers seamlessly:


Inspecting The Container

Interacting with Container

Do you want to know how to access the containers? Check out these fundamental commands:

Interacting with Container1

Image Management Commands

Here’s the list of Docker commands that helps you manage the Docker Images:


image management commands

Image Transfer Commands

Here’s the list of Docker image transfer commands:


Image Transfer Comnands

Builder Main Commands

Want to know how to build Docker Image? Do check out the list of Image Build Commands:


Builder Main Commands

The Docker CLI

Manage images


docker build


docker build [options] .
  -t "app/container_name"    # name

Create an image from a Dockerfile.

docker run


docker run [options] IMAGE
  # see `docker create` for options

Run a command in an image.

Manage containers


docker create


docker create [options] IMAGE
  -a, --attach               # attach stdout/err
  -i, --interactive          # attach stdin (interactive)
  -t, --tty                  # pseudo-tty
      --name NAME            # name your image
  -p, --publish 5000:5000    # port map
      --expose 5432          # expose a port to linked containers
  -P, --publish-all          # publish all ports
      --link container:alias # linking
  -v, --volume `pwd`:/app    # mount (absolute paths needed)
  -e, --env NAME=hello       # env vars

Example


$ docker create --name app_redis_1 \
  --expose 6379 \
  redis:3.0.2

Create a container from an image.

docker exec


docker exec [options] CONTAINER COMMAND
  -d, --detach        # run in background
  -i, --interactive   # stdin
  -t, --tty           # interactive

Example

$ docker exec app_web_1 tail logs/development.log
$ docker exec -t -i app_web_1 rails c

Run commands in a container.

docker start

docker start [options] CONTAINER
  -a, --attach        # attach stdout/err
  -i, --interactive   # attach stdin

docker stop [options] CONTAINER

Start/stop a container.

docker ps

$ docker ps
$ docker ps -a
$ docker kill $ID

Manage containers using ps/kill.

Images

docker images

$ docker images
  REPOSITORY   TAG        ID
  ubuntu       12.10      b750fe78269d
  me/myapp     latest     7b2431a8d968
$ docker images -a   # also show intermediate

Manages images.

docker rmi

docker rmi b750fe78269d

Deletes images.

Also see

Dockerfile

Inheritance

FROM ruby:2.2.2

Variables

ENV APP_HOME /myapp
RUN mkdir $APP_HOME

Initialization

RUN bundle install
WORKDIR /myapp
VOLUME ["/data"]
# Specification for mount point
ADD file.xyz /file.xyz
COPY --chown=user:group host_file.xyz /path/container_file.xyz

Onbuild

ONBUILD RUN bundle install
# when used with another file

Commands

EXPOSE 5900
CMD    ["bundle", "exec", "rails", "server"]

Entrypoint

ENTRYPOINT ["executable", "param1", "param2"]
ENTRYPOINT command param1 param2

Configures a container that will run as an executable.

ENTRYPOINT exec top -b

This will use shell processing to substitute shell variables, and will ignore any CMD or docker run command line arguments.

Metadata

LABEL version="1.0"
LABEL "com.example.vendor"="ACME Incorporated"
LABEL com.example.label-with-value="foo"
LABEL description="This text illustrates \
that label-values can span multiple lines."

See also

docker-compose

Basic example

# docker-compose.yml
version: '2'

services:
  web:
    build: .
    # build from Dockerfile
    context: ./Path
    dockerfile: Dockerfile
    ports:
     - "5000:5000"
    volumes:
     - .:/code
  redis:
    image: redis

Commands

docker-compose start
docker-compose stop
docker-compose pause
docker-compose unpause
docker-compose ps
docker-compose up
docker-compose down

Reference

Building

web:
  # build from Dockerfile
  build: .
  # build from custom Dockerfile
  build:
    context: ./dir
    dockerfile: Dockerfile.dev
  # build from image
  image: ubuntu
  image: ubuntu:14.04
  image: tutum/influxdb
  image: example-registry:4000/postgresql
  image: a4bc65fd

Ports

  ports:
    - "3000"
    - "8000:80"  # guest:host
  # expose ports to linked services (not to host)
  expose: ["3000"]

Commands

  # command to execute
  command: bundle exec thin -p 3000
  command: [bundle, exec, thin, -p, 3000]
  # override the entrypoint
  entrypoint: /app/start.sh
  entrypoint: [php, -d, vendor/bin/phpunit]

Environment variables

  # environment vars
  environment:
    RACK_ENV: development
  environment:
    - RACK_ENV=development
  # environment vars from file
  env_file: .env
  env_file: [.env, .development.env]

Dependencies

  # makes the `db` service available as the hostname `database`
  # (implies depends_on)
  links:
    - db:database
    - redis
  # make sure `db` is alive before starting
  depends_on:
    - db

Other options

  # make this service extend another
  extends:
    file: common.yml  # optional
    service: webapp
  volumes:
    - /var/lib/mysql
    - ./_data:/var/lib/mysql

Advanced features

Labels

services:
  web:
    labels:
      com.example.description: "Accounting web app"

DNS servers

services:
  web:
    dns: 8.8.8.8
    dns:
      - 8.8.8.8
      - 8.8.4.4

Devices

services:
  web:
    devices:
    - "/dev/ttyUSB0:/dev/ttyUSB0"
services:
  web:
    external_links:
      - redis_1
      - project_db_1:mysql

Hosts

services:
  web:
    extra_hosts:
      - "somehost:192.168.1.100"

sevices

To view list of all the services runnning in swarm

docker service ls 

To see all running services

docker stack services stack_name

to see all services logs

docker service logs stack_name service_name 

To scale services quickly across qualified node

docker service scale stack_name_service_name=replicas

clean up

To clean or prune unused (dangling) images

docker image prune 

To remove all images which are not in use containers , add - a

docker image prune -a 

To prune your entire system

docker system prune 

To leave swarm

docker swarm leave  

To remove swarm ( deletes all volume data and database info)

docker stack rm stack_name  

To kill all running containers

docker kill $(docekr ps -q ) 

Contributors

Sangam biradar - Docker Community Leader
Ajeet Singh Raina - Docker Captain, Collabnix

Support and Community

If you do get enough interest to contributer to this Cheat Sheet, the community at Collabnix is available to support you. Feel free to raise PR and get your favorite Cheat Sheet added to the list via PR, or you can connect to us either on Slack or Discord server.

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