ubuntu.md

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Instructions for installing Docker Engine on Ubuntu	requirements, apt, installation, ubuntu, install, uninstall, upgrade, update	/ee/docker-ee/ubuntu/ /engine/installation/linux/docker-ce/ubuntu/ /engine/installation/linux/docker-ee/ubuntu/ /engine/installation/linux/ubuntu/ /engine/installation/linux/ubuntulinux/ /engine/installation/ubuntulinux/ /install/linux/docker-ce/ubuntu/ /install/linux/docker-ee/ubuntu/ /install/linux/ubuntu/ /installation/ubuntulinux/	Install Docker Engine on Ubuntu	4

To get started with Docker Engine on Ubuntu, make sure you meet the prerequisites, then install Docker.

Prerequisites

OS requirements

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

• Ubuntu Hirsute 21.04
• Ubuntu Focal 20.04 (LTS)
• Ubuntu Bionic 18.04 (LTS)

Docker Engine is supported on x86_64 (or amd64), armhf, arm64, and s390x architectures.

Ubuntu 16.04 LTS "Xenial Xerus" end-of-life

Ubuntu Linux 16.04 LTS reached the end of its five-year LTS window on April 30th 2021 and is no longer supported. Docker no longer releases packages for this distribution (including patch- and security releases). Users running Docker on Ubuntu 16.04 are recommended to update their system to a currently supported LTS version of Ubuntu. {: .important }

Uninstall old versions

Older versions of Docker were called docker, docker.io, or docker-engine. If these are installed, uninstall them:

$ sudo apt-get remove docker docker-engine docker.io containerd runc

It's OK if apt-get reports that none of these packages are installed.

The contents of /var/lib/docker/, including images, containers, volumes, and networks, are preserved. If you do not need to save your existing data, and want to start with a clean installation, refer to the uninstall Docker Engine section at the bottom of this page.

Supported storage drivers

Docker Engine on Ubuntu supports overlay2, aufs and btrfs storage drivers.

Docker Engine uses the overlay2 storage driver by default. If you need to use aufs instead, you need to configure it manually. See use the AUFS storage driver

Installation methods

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

• Most users set up Docker's repositories and install from them, for ease of installation and upgrade tasks. This is the recommended approach.

• Some users download the DEB package and install it manually and manage upgrades completely manually. This is useful in situations such as installing Docker on air-gapped systems with no access to the internet.

• In testing and development environments, some users choose to use automated convenience scripts to install Docker.

Install using the 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

{% assign download-url-base = "https://download.docker.com/linux/ubuntu" %}

1. 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 \
       apt-transport-https \
       ca-certificates \
       curl \
       gnupg \
       lsb-release

2. Add Docker's official GPG key:

   $ curl -fsSL {{ download-url-base }}/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

3. Use the following command to set up the stable repository. To add the nightly or test repository, add the word nightly or test (or both) after the word stable in the commands below. Learn about nightly and test channels.

   Note: The lsb_release -cs sub-command below returns the name of your Ubuntu distribution, such as xenial. Sometimes, in a distribution like Linux Mint, you might need to change $(lsb_release -cs) to your parent Ubuntu distribution. For example, if you are using Linux Mint Tessa, you could use bionic. Docker does not offer any guarantees on untested and unsupported Ubuntu distributions.

   • x86_64 / amd64
   • armhf
   • arm64
   • s390x

   $ echo \
     "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] {{ download-url-base }} \
     $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

   $ echo \
     "deb [arch=armhf signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] {{ download-url-base }} \
     $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

   $ echo \
     "deb [arch=arm64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] {{ download-url-base }} \
     $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

   $ echo \
     "deb [arch=s390x signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] {{ download-url-base }} \
     $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Install Docker Engine

1. Update the apt package index, and install the latest version of Docker Engine and containerd, or go to the next step to install a specific version:

   $ sudo apt-get update
   $ sudo apt-get install docker-ce docker-ce-cli containerd.io

   Got multiple Docker repositories?

   If you have multiple Docker repositories enabled, installing or updating without specifying a version in the apt-get install or apt-get update command always installs the highest possible version, which may not be appropriate for your stability needs.

2. To install a specific version of Docker Engine, list the available versions in the repo, then select and install:

   a. List the versions available in your repo:

   $ apt-cache madison docker-ce
   
     docker-ce | 5:18.09.1~3-0~ubuntu-xenial | {{ download-url-base }}  xenial/stable amd64 Packages
     docker-ce | 5:18.09.0~3-0~ubuntu-xenial | {{ download-url-base }}  xenial/stable amd64 Packages
     docker-ce | 18.06.1~ce~3-0~ubuntu       | {{ download-url-base }}  xenial/stable amd64 Packages
     docker-ce | 18.06.0~ce~3-0~ubuntu       | {{ download-url-base }}  xenial/stable amd64 Packages

   b. Install a specific version using the version string from the second column, for example, 5:18.09.1~3-0~ubuntu-xenial.

   $ sudo apt-get install docker-ce=<VERSION_STRING> docker-ce-cli=<VERSION_STRING> containerd.io

3. Verify that Docker Engine is installed correctly by running the hello-world image.

   $ sudo docker run hello-world

   This command downloads a test image and runs it in a container. When the container runs, it prints a message and exits.

Docker Engine is installed and running. The docker group is created but no users are added to it. You need 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, first run sudo apt-get update, then follow the installation instructions, choosing the new version you want to install.

Install from a package

If you cannot use Docker's 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.

1. Go to [{{ download-url-base }}/dists/]({{ download-url-base }}/dists/){: target="blank" rel="noopener" class="" }, choose your Ubuntu version, then browse to pool/stable/, choose amd64, armhf, arm64, or s390x, and download the .deb file for the Docker Engine version you want to install.

   Note

   To install a nightly or test (pre-release) package, change the word stable in the above URL to nightly or test. Learn about nightly and test channels.

2. Install Docker Engine, changing the path below to the path where you downloaded the Docker package.

   $ sudo dpkg -i /path/to/package.deb

   The Docker daemon starts automatically.

3. Verify that Docker Engine is installed correctly by running the hello-world image.

   $ sudo docker run hello-world

   This command downloads a test image and runs it in a container. When the container runs, it prints a message and exits.

Docker Engine is installed and running. The docker group is created but no users are added to it. You need to use sudo to run Docker commands. Continue to Post-installation steps for Linux 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 file and repeat the installation procedure, pointing to the new file.

{% include install-script.md %}

Uninstall Docker Engine

1. Uninstall the Docker Engine, CLI, and Containerd packages:

   $ sudo apt-get purge docker-ce docker-ce-cli containerd.io

2. Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes:

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

You must 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.