在ubuntu上安装docker

# Uninstall

# Uninstall old versions

卸载旧的安装包

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

在 /var/lib/docker/目录下,包含了已经下载的镜像，配置的 containers、volumes、网络等，如果想要干净的安装环境，可以使用下面的命令。

# Uninstall Docker Engine

Uninstall the Docker Engine, CLI, Containerd, and Docker Compose packages:

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

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
```

# Installation methods

# 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

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

Use the following command to 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

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

# Install Docker Engine

Update the apt package index, and install the latest version of Docker Engine, containerd, and Docker Compose, 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 docker-compose-plugin
```
Receiving a GPG error when running apt-get update?

Your default umask may not be set correctly, causing the public key file for the repo to not be detected. Run the following command and then try to update your repo again: sudo chmod a+r /etc/apt/keyrings/docker.gpg.
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 (opens new window) to allow non-privileged users to run Docker commands and for other optional configuration steps.

# Install using the convenience script

Docker provides a convenience script at get.docker.com (opens new window) to install Docker into development environments quickly and non-interactively. The convenience script is not recommended for production environments, but can be used as an example to create a provisioning script that is tailored to your needs. Also refer to the install using the repository (opens new window) steps to learn about installation steps to install using the package repository. The source code for the script is open source, and can be found in the docker-install repository on GitHub (opens new window).

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, and does not 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 (major) upgrades in a test environment before deploying to your production systems.
The script is not 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, causing outdated versions to be used.

Tip: preview script steps before running

You can run the script with the DRY_RUN=1 option to learn what steps the script will execute during installation:
$ curl -fsSL https://get.docker.com -o get-docker.sh
$ DRY_RUN=1 sh ./get-docker.sh

This example downloads the script from get.docker.com (opens new window) 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
<...>

Docker is installed. 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 cannot 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 (opens new window). Docker can also be installed 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) (opens new window).

# Upgrade Docker Engine

To upgrade Docker Engine, first run sudo apt-get update, then follow the installation instructions (opens new window), choosing the new version you want to install.

# 配置 aliyun 源

sudo add-apt-repository \
   'deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu \
   $(lsb_release -cs) \
   stable'

# 安装

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

在centos7上安装docker →