DockerCheatsheet

Docker Cheatsheet

This page presents a list of commonly used commands in docker.

Installation

Install Docker On Ubuntu

# Update the apt package index and install packages to allow apt to use a repository over HTTPS.
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg lsb-release

# Add Docker’s official GPG key.
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

# set up the repository.
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install docker.
sudo apt update
sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin

# Verify if docker is successfully installed.
sudo docker run hello-world

Install Docker On Debian

# Update the apt package index and install packages to allow apt to use a repository over HTTPS.
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg lsb-release

# Add Docker’s official GPG key.
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

# Set up the repository.
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install docker.
sudo apt update && sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin

# Verify if docker is successfully installed.
sudo docker run hello-world

Run Docker Commands Without Sudo

# Create a docker group and add yourself to it,
# so that you don't need sudo before your docker command.
# Note that you'll need to log out and log in for the changes to take effect.
sudo groupadd docker
sudo usermod -aG docker $USER

Commands

Image Management

# Build an image.
docker build -t <image-name>

# Build an Image without using cache.
docker build -t <image-name> . –no-cache

# List local images.
docker images

# Create a docker image from a running container.
docker commit <container-name-or-id> <image-name>

# Delete a local image.
docker rmi <image-name>

# Remove all unused images.
docker image prune

# Push docker image to docker registry.
# Image name has to be in the form of <docker-registry-address>/<docker-repo>[:<docker-tag>].
# Examples are:
# * docker-repo.local/my-image
# * docker-repo.local/my-image:debug
docker push <image-name>

# Remove dangling images.
docker images -qf dangling=true | xargs docker rmi

Container Management

Create a docker container.

docker create <image-name>

# Run a container from an image.
docker run <image-name>

# Run a container in interactive mode.
docker run -it <image-name>

# Run a container in the background.
docker run -d <image-name>

# Run a container with a port mapping.
docker run -p <host-port>:<container-port> <image-name>

# Start an existing container.
docker start <container-id-or-name>

# Restart a container.
docker restart <container-id-or-name>

# Pause a container.
docker pause <container-id-or-name>

# Unpause a container.
docker unpause <container-id-or-name>

# Wait until running container stops.
docker wait <container-id-or-name>

# Stop a container.
docker stop <container-id-or-name>

# Kill a container.
docker kill <container-id-or-name>

# Attach a container. (C-p C-q to detach)
docker attach <container-id-or-name>

# Rename a container.
docker rename <container-id-or-name> <new-name>

# Update a container.
docker update [OPTIONS] <container-id-or-name>

# Remove a stopped container.
docker rm <container-id-or-name>

# Follow the logs of a container.
docker logs -f <container-id-or-name>

# Inspect a running container.
docker inspect <container-id-or-name>

# List running containers.
docker ps

# List all containers.
docker ps -a

File Copy

# Copy files from host to container.
docker cp <host-filepath> <container-id-or-name>:<container-filepath>

# Copy files from container to host.
docker cp <container-id-or-name>:<container-filepath> <host-filepath>

# Export all files in container to host.
docker export <container-id-or-name> -o <filename>

Network Management

# Create a docker network.
docker network create --subnet <subnet> --gateway <gateway> <docker-network-name>

# Remove a docker network.
docker network rm <docker-network-name>

# List all docker networks.
docker network ls

# Inspect a docker network.
docker network inspect <docker-network-name>

# Connect a container with a docker network.
docker network connect <docker-network-name> <container-id-or-name>

# Disconnect a container with a docker network.
docker network disconnect <docker-network-name> <container-id-or-name>

Docker In Docker

# Run a docker container which maps the /var/run/docker.sock file,
# so that you can run another docker container within this one.
docker run -v /var/run/docker.sock:/var/run/docker.sock -it <image-name>

Dockerfile Builder Commands

Command	Description
FROM IMAGE_NAME	Docker base image name.
MAINTAINER EMAIL	Maintainer’s email address.
COPY SRC-FILE-ON-HOST DST-FILE-ON-DOCKER	Copy files from host to docker image.
RUN COMMAND	Run a command when building the image.
USER USERNAME	Set the default user name.
WORKDIR DIR	Set the default working directory.
CMD COMMAND	Start up default command which can be overridden by docker cli.
ENTRYPOINT COMMAND	Start up default command which cannot be overridden by docker cli.
ENV ENV-NAME ENV-VALUE	Environment variables.

Docker Config

Insecure Docker Registry

# Add the following content to /etc/docker/daemon.json if you using an insecure docker registry.
{
	"insecure-registries" : ["<your-docker-register-server-ip-or-hostname>"]
}

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