To get started with Docker Engine on Ubuntu, make sure you meet the prerequisites, then install Docker.
要開始在Ubuntu上使用Docker引擎，請確保滿足先決條件，然后安裝Docker。
Prerequisites
OS requirements
To install Docker Engine, you need the 64-bit version of one of these Ubuntu versions:
先決條件
操作系統要求
要安裝Docker Engine，您需要這些Ubuntu版本之一的64位版本：
Ubuntu Groovy 20.10
Ubuntu Focal 20.04 (LTS)
Ubuntu Bionic 18.04 (LTS)
Ubuntu Xenial 16.04 (LTS)
Docker Engine is supported on x86_64 (or amd64), armhf, and arm64 architectures.
x86_64（或amd64）、armhf和arm64體系結構支持Docker引擎。
Uninstall old versions
Older versions of Docker were called docker, docker.io, or docker-engine. If these are installed, uninstall them:
卸載舊版本
Docker的舊版本叫做Docker，碼頭工人，或docker引擎。如果已安裝，請卸載它們：
安裝Docker 引擎
一、卸載舊版本
sudo apt-get remove docker docker-engine docker.io containerd runc
二、設置存儲庫
使用存儲庫安裝
在新主機上首次安裝Docker引擎之前，需要設置Docker存儲庫。之后，您可以從存儲庫安裝和更新Docker。
設置存儲庫
更新apt程序包索引並安裝程序包，以允許apt通過HTTPS使用存儲庫：
sudo apt-get update
sudo apt-get install \
apt-transport-https \
ca-certificates \
curl \
gnupg-agent \
software-properties-common
三、添加Docker的官方GPG密鑰
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
四、設置指紋
sudo apt-key fingerprint 0EBFCD88
五、安裝Docker 引擎
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io
六、測試
sudo docker run hello-world
七、查看docker版本
root@yang:~# docker --version Docker version 20.10.3, build 48d30b5
安裝指定版本
一、查詢可安裝版本
要安裝特定版本的Docker Engine，請在repo中列出可用版本，然后選擇並安裝：
a、 列出您的回購中可用的版本：
apt-cache madison docker-ce
docker-ce | 5:20.10.3~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:20.10.2~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:20.10.1~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:20.10.0~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.15~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.14~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.13~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.12~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.11~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.10~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.9~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.8~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.7~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.6~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.5~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.4~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.3~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.2~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.1~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:19.03.0~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.9~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.8~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.7~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.6~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.5~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.4~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.3~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.2~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.1~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 5:18.09.0~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 18.06.3~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 18.06.2~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 18.06.1~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 18.06.0~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages docker-ce | 18.03.1~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
二、安裝特定版本
b、 使用第二列中的版本字符串安裝特定版本，例如 5:20.10.3~3-0~ubuntu-bionic。
sudo apt-get install docker-ce=5:20.10.3~3-0~ubuntu-bionic docker-ce-cli=5:20.10.3~3-0~ubuntu-bionic containerd.io
卸載docker 引擎
一、卸載Docker引擎、CLI和Containerd包：
sudo apt-get purge docker-ce docker-ce-cli containerd.io
二、刪除所有鏡像、容器和卷
主機上的映像、容器、卷或自定義配置文件不會自動刪除。要刪除所有圖像、容器和卷，請執行以下操作：
sudo rm -rf /var/lib/docker
必須手動刪除任何已編輯的配置文件。