Installing docker on ubuntu

Posted by The_Walrus on Sun, 20 Feb 2022 01:11:13 +0100


Docker installation

Environmental preparation


2. Use Xshell to connect to the remote server for operation

Environment view

#The system kernel is above 3.10
zzw@zzw-virtual-machine:~$ uname -r

zzw@zzw-virtual-machine:~$ cat /etc/os-release
VERSION="20.04.2 LTS (Focal Fossa)"
PRETTY_NAME="Ubuntu 20.04.2 LTS"

Automatic installation using official installation script

The installation commands are as follows:

curl -fsSL | bash -s docker --mirror Aliyun

You can also use the domestic daocloud one click installation command:

curl -sSL | sh

Manual installation

Uninstall old version

The old version of docker is called docker, docker IO or docker engine. If installed, uninstall them:

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

It is currently called docker engine community software package docker CE.

There are two ways to install docker engine community.

Use Docker warehouse for installation

Before installing Docker engine community on the new host for the first time, you need to set up the Docker warehouse. After that, you can install and update Docker from the warehouse.

Set up warehouse

Update apt package index.

$ sudo apt-get update

Install apt dependency package to obtain the warehouse through HTTPS:

$ sudo apt-get install \
  apt-transport-https \
  ca-certificates \
  curl \
  gnupg-agent \

Add the official GPG key of Docker: (if Alibaba cloud warehouse is used, look down and skip the current step and use Alibaba cloud key)

curl -fsSL | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

$ sudo add-apt-repository \
   "deb [arch=amd64] \
  $(lsb_release -cs) \

Use the following instructions to set up the stable version warehouse (if Alibaba cloud image is recommended, Alibaba cloud key must be used)

#If Alibaba cloud image is recommended, you must use Alibaba cloud key
$ curl -fsSL | sudo apt-key add -
$ sudo add-apt-repository "deb [arch=amd64] $(lsb_release -cs) stable"

Install docker engine community

Update apt package index.

$ sudo apt-get update

Install the latest version of docker engine community and containerd, or go to the next step to install a specific version:

$ sudo apt-get install docker-ce docker-ce-cli

To install a specific version of docker engine community, list the available versions in the warehouse and select an installation. List the versions available in your warehouse:

$ apt-cache madison docker-ce

  docker-ce | 5:18.09.1~3-0~ubuntu-xenial |  xenial/stable amd64 Packages
  docker-ce | 5:18.09.0~3-0~ubuntu-xenial |  xenial/stable amd64 Packages
  docker-ce | 18.06.1~ce~3-0~ubuntu       |  xenial/stable amd64 Packages
  docker-ce | 18.06.0~ce~3-0~ubuntu       |  xenial/stable amd64 Packages

Use the version string in the second column to install a specific version, for example, 5:18.09.13-0ubuntu xenial.

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

Test whether Docker is successfully installed. Enter the following instructions and print out the following information to ensure successful installation:

$ sudo docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete                                                                                                                                  Digest: sha256:c3b4ada4687bbaa170745b3e4dd8ac3f194ca95b2d0518b417fb47e5879d9b5f
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:

For more examples and ideas, visit:


Install using Shell script

Docker is and A convenient script is provided on to quickly install the edge version and test version of docker engine community. The source code of the script is in the docker install repository. It is not recommended to use these scripts in a production environment. Before using them, you should understand the potential risks:

  • The script needs to run root or have sudo privileges. Therefore, you should carefully check and review the script before running it.
  • These scripts try to detect the Linux distribution and version and configure the package management system for you. In addition, the script does not allow you to customize any installation parameters. From the perspective of Docker or your own organization's guidelines and standards, this may lead to unsupported configurations.
  • These scripts will install all dependencies and recommendations of the package manager without confirmation. Depending on the current configuration of the host, a large number of software packages may be installed.
  • The script does not provide an option to specify which version of Docker to install, but installs the latest version published in the edge channel.
  • If other mechanisms have been used to install Docker on the host, please do not use convenient scripts.

This example uses The script on installs the latest version of docker engine community on Linux. To install the latest test version, use test instead docker. com. In each of the following commands, test is used instead of get every time.

$ curl -fsSL -o
$ sudo sh

If you want to use docker as a non root user, you should consider adding users to the docker group in a manner similar to the following:

$ sudo usermod -aG docker your-user

Uninstall docker

To delete an installation package:

sudo apt-get purge docker-ce

Delete image, container, configuration file and other contents:

sudo rm -rf /var/lib/docker

Topics: Docker Ubuntu