👨🏽‍💻Docker Cheat Sheet🐬

As this is a cheat sheet I already assume you understand the basics of Docker and what it does.

Index

• Docker CLI Commands
• Docker Compose CLI Commands
• Docker CLI Flags

docker image by SurajSarkar

Docker CLI Commands

Docker Images

• docker images - List all images
• docker pull <image_name> - Pull an image from a registry
• docker build -t <image_name> . - Build an image from a Dockerfile in the current directory
• docker push <image_name> - Push an image to a registry

Docker Containers

• docker ps - List all running containers
• docker run <image_name> - Start a new container from an image
• docker run -it <image_name> bash - Start a new container in interactive mode and open a bash shell
• docker stop <container_id> - Stop a running container
• docker rm <container_id> - Remove a container

Dockerfile

A Dockerfile is a script that contains instructions for building an image.

FROM <base_image>

WORKDIR /app

COPY . .

RUN <command>

EXPOSE <port>

CMD ["<command>", "<arg1>", "<arg2>", ...]

• FROM - Specifies the base image to use
• WORKDIR - Sets the working directory for commands that follow
• COPY - Copies files from the host to the image
• RUN - Runs a command in the image
• EXPOSE - Exposes a port for the container to listen on
• CMD - Specifies the command to run when the container starts

Docker Compose CLI Commands

Docker Compose CLI Commands

• docker-compose up - Start the services defined in the docker-compose.yml file
• docker-compose down - Stop and remove all containers, networks, and volumes defined in the docker-compose.yml file
• docker-compose ps - List the containers created by docker-compose
• docker-compose logs - Show the logs of the containers defined in the docker-compose.yml file
• docker-compose exec <service_name> <command> - Run a command in a running service container

Docker Compose File

Docker Compose CLI Commands

• docker-compose up - Start the services defined in the docker-compose.yml file
• docker-compose down - Stop and remove all containers, networks, and volumes defined in the docker-compose.yml file
• docker-compose ps - List the containers created by docker-compose
• docker-compose logs - Show the logs of the containers defined in the docker-compose.yml file
• docker-compose exec <service_name> <command> - Run a command in a running service container

Docker Compose File

The docker-compose.yml file defines the services, networks, and volumes for your application.

version: '3'

services:
  <service_name>:
    build: .
    ports:
      - "<host_port>:<container_port>"
    volumes:
      - "<host_path>:<container_path>"

networks:
  <network_name>:
    driver: bridge

volumes:
  <volume_name>:
    driver: local

• version - Specifies the version of the Compose file format
• services - Defines the services for your application
• build - Specifies the directory containing the Dockerfile for the service
• ports - Maps a port on the host to a port in the container
• volumes - Mounts a host path to a path in the container
• networks - Defines the networks for your application
• driver - Specifies the driver to use for the network or volume

Docker CLI Flags

docker run Flags

• -d - Run the container in the background
• -p <host_port>:<container_port> - Map a port on the host to a port in the container
• -v <host_path>:<container_path> - Mount a host path to a path in the container
• -e <variable_name>=<value> - Set an environment variable for the container
• -it - Start the container in interactive mode and open a shell
• --name <container_name> - Assign a name to the container
• --rm - Automatically remove the container when it stops

docker build Flags

• -t <image_name> - Assign a name and a tag to the image being built
• --no-cache - Build the image without using the cache
• --pull - Always force Docker to pull the latest version of the base image

docker images Flags

• -a - List all images, including intermediate images
• --filter <filter_expression> - Filter the list of images based on a condition
• --format <output_format> - Specify the format of the output

docker ps Flags

• -a - List all containers, including stopped containers
• -q - Only display the container IDs
• --filter <filter_expression> - Filter the list of containers based on a condition
• --format <output_format> - Specify the format of the output