Docker installation in linux

Install Docker Engine on Debian

To get started with Docker Engine on Debian, make sure you meet the prerequisites, and then follow the installation steps.

Prerequisites

Note

If you use ufw or firewalld to manage firewall settings, be aware that when you expose container ports using Docker, these ports bypass your firewall rules. For more information, refer to Docker and ufw.

OS requirements

To install Docker Engine, you need the 64-bit version of one of these Debian versions:

Docker Engine for Debian is compatible with x86_64 (or amd64), armhf, and arm64 architectures.

Uninstall old versions

Before you can install Docker Engine, you must first make sure that any conflicting packages are uninstalled.

Distro maintainers provide an unofficial distribution of Docker packages in their repositories. You must uninstall these packages before you can install the official version of Docker Engine.

The unofficial packages to uninstall are:

Moreover, Docker Engine depends on containerd and runc . Docker Engine bundles these dependencies as one bundle: containerd.io . If you have installed the containerd or runc previously, uninstall them to avoid conflicts with the versions bundled with Docker Engine.

Run the following command to uninstall all conflicting packages:

$ for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done 

apt-get might report that you have none of these packages installed.

Images, containers, volumes, and networks stored in /var/lib/docker/ aren’t automatically removed when you uninstall Docker. If you want to start with a clean installation, and prefer to clean up any existing data, read the uninstall Docker Engine section.

Installation methods

You can install Docker Engine in different ways, depending on your needs:

• Docker Engine comes bundled with Docker Desktop for Linux. This is the easiest and quickest way to get started.
• Set up and install Docker Engine from Docker’s apt repository.
• Install it manually and manage upgrades manually.
• Use a convenience scripts. Only recommended for testing and development environments.

Install using the apt repository

Before you install Docker Engine for the first time on a new host machine, you need to set up the Docker repository. Afterward, you can install and update Docker from the repository.

Set up the repository

$ sudo apt-get update $ sudo apt-get install ca-certificates curl gnupg 

$ sudo install -m 0755 -d /etc/apt/keyrings $ curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg $ sudo chmod a+r /etc/apt/keyrings/docker.gpg 

$ echo \ "deb [arch si">$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \ "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \ sudo tee /etc/apt/sources.list.d/docker.list > /dev/null 

Note If you use a derivative distro, such as Kali Linux, you may need to substitute the part of this command that’s expected to print the version codename:

$(. /etc/os-release && echo "$VERSION_CODENAME") 

Install Docker Engine

To install the latest version, run:

 $ sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin 

To install a specific version of Docker Engine, start by listing the available versions in the repository:

# List the available versions: $ apt-cache madison docker-ce | awk '< print $3 >' 5:24.0.0-1~debian.11~bullseye 5:23.0.6-1~debian.11~bullseye 

Select the desired version and install:

$ VERSION_STRING=5:24.0.0-1~debian.11~bullseye $ sudo apt-get install docker-ce=$VERSION_STRING docker-ce-cli=$VERSION_STRING containerd.io docker-buildx-plugin docker-compose-plugin 

$ sudo docker run hello-world 

You have now successfully installed and started Docker Engine.

Tip

Receiving errors when trying to run without root?

The docker user group exists but contains no users, which is why you’re required to use sudo to run Docker commands. Continue to Linux postinstall to allow non-privileged users to run Docker commands and for other optional configuration steps.

Upgrade Docker Engine

To upgrade Docker Engine, follow the installation instructions, choosing the new version you want to install.

Install from a package

If you can’t use Docker’s apt repository to install Docker Engine, you can download the deb file for your release and install it manually. You need to download a new file each time you want to upgrade Docker Engine.

1. Go to https://download.docker.com/linux/debian/dists/ .
2. Select your Debian version in the list.
3. Go to pool/stable/ and select the applicable architecture ( amd64 , armhf , arm64 , or s390x ).
4. Download the following deb files for the Docker Engine, CLI, containerd, and Docker Compose packages:
   • containerd.io__.deb
   • docker-ce__.deb
   • docker-ce-cli__.deb
   • docker-buildx-plugin__.deb
   • docker-compose-plugin__.deb
5. Install the .deb packages. Update the paths in the following example to where you downloaded the Docker packages.

$ sudo dpkg -i ./containerd.io__arch>.deb \ ./docker-ce__arch>.deb \ ./docker-ce-cli__arch>.deb \ ./docker-buildx-plugin__arch>.deb \ ./docker-compose-plugin__arch>.deb 

$ sudo service docker start $ sudo docker run hello-world 

You have now successfully installed and started Docker Engine.

Tip

Receiving errors when trying to run without root?

The docker user group exists but contains no users, which is why you’re required to use sudo to run Docker commands. Continue to Linux postinstall to allow non-privileged users to run Docker commands and for other optional configuration steps.

Upgrade Docker Engine

To upgrade Docker Engine, download the newer package files and repeat the installation procedure, pointing to the new files.

Install using the convenience script

Docker provides a convenience script at https://get.docker.com/ to install Docker into development environments non-interactively. The convenience script isn’t recommended for production environments, but it’s useful for creating a provisioning script tailored to your needs. Also refer to the install using the repository steps to learn about installation steps to install using the package repository. The source code for the script is open source, and you can find it in the docker-install repository on GitHub.

Always examine scripts downloaded from the internet before running them locally. Before installing, make yourself familiar with potential risks and limitations of the convenience script:

• The script requires root or sudo privileges to run.
• The script attempts to detect your Linux distribution and version and configure your package management system for you.
• The script doesn’t allow you to customize most installation parameters.
• The script installs dependencies and recommendations without asking for confirmation. This may install a large number of packages, depending on the current configuration of your host machine.
• By default, the script installs the latest stable release of Docker, containerd, and runc. When using this script to provision a machine, this may result in unexpected major version upgrades of Docker. Always test upgrades in a test environment before deploying to your production systems.
• The script isn’t designed to upgrade an existing Docker installation. When using the script to update an existing installation, dependencies may not be updated to the expected version, resulting in outdated versions.

Tip: preview script steps before running

You can run the script with the —dry-run option to learn what steps the script will run when invoked:

$ curl -fsSL https://get.docker.com -o get-docker.sh $ sudo sh ./get-docker.sh --dry-run 

This example downloads the script from https://get.docker.com/ and runs it to install the latest stable release of Docker on Linux:

$ curl -fsSL https://get.docker.com -o get-docker.sh $ sudo sh get-docker.sh Executing docker install script, commit: 7cae5f8b0decc17d6571f9f52eb840fbc13b2737 

You have now successfully installed and started Docker Engine. The docker service starts automatically on Debian based distributions. On RPM based distributions, such as CentOS, Fedora, RHEL or SLES, you need to start it manually using the appropriate systemctl or service command. As the message indicates, non-root users can’t run Docker commands by default.

Use Docker as a non-privileged user, or install in rootless mode?

The installation script requires root or sudo privileges to install and use Docker. If you want to grant non-root users access to Docker, refer to the post-installation steps for Linux. You can also install Docker without root privileges, or configured to run in rootless mode. For instructions on running Docker in rootless mode, refer to run the Docker daemon as a non-root user (rootless mode).

Install pre-releases

Docker also provides a convenience script at https://test.docker.com/ to install pre-releases of Docker on Linux. This script is equal to the script at get.docker.com , but configures your package manager to use the test channel of the Docker package repository. The test channel includes both stable and pre-releases (beta versions, release-candidates) of Docker. Use this script to get early access to new releases, and to evaluate them in a testing environment before they’re released as stable.

To install the latest version of Docker on Linux from the test channel, run:

$ curl -fsSL https://test.docker.com -o test-docker.sh $ sudo sh test-docker.sh 

Upgrade Docker after using the convenience script

If you installed Docker using the convenience script, you should upgrade Docker using your package manager directly. There’s no advantage to re-running the convenience script. Re-running it can cause issues if it attempts to re-install repositories which already exist on the host machine.

Uninstall Docker Engine

$ sudo apt-get purge docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras 

$ sudo rm -rf /var/lib/docker $ sudo rm -rf /var/lib/containerd 

You have to delete any edited configuration files manually.

Next steps

• Continue to Post-installation steps for Linux.
• Review the topics in Develop with Docker to learn how to build new applications using Docker.

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