Ubuntu安装Docker的方法

0、安装前准备

删除老的版本
sudo apt-get remove docker docker-engine docker.io containerd runc

升级apt获得最新更新
sudo apt-get update

安装Docker允许通过HTTPS才能使用的软件包
sudo apt-get install \
apt-transport-https \
ca-certificates \
curl \
gnupg-agent \
software-properties-common

添加Docker’s official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add –

sudo apt-key fingerprint 0EBFCD88
显示：
pub rsa4096 2017-02-22 [SCEA]
9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88
uid [ 未知 ] Docker Release (CE deb) <docker@docker.com>
sub rsa4096 2017-02-22 [S]

开始安装

1、加入Docker源

sudo add-apt-repository \
“deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable”

【如果是19.10，则试用18.04】

sudo add-apt-repository “deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable”

sudo apt update

【另外】如果出现错误，sudo nano /etc/apt/sources.list，把输入错误的源给注释掉（在行的最前面加#）或者删除掉

2、列出可用版本

apt-cache madison docker-ce

3、安装最新版本docker

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

【或者】安装制定版本docker
sudo apt-get install docker-ce=<VERSION_STRING> docker-ce-cli=<VERSION_STRING> containerd.io

4、测试 Docker 是否安装成功

sudo docker run hello-world

显示：
Unable to find image ‘hello-world:latest’ locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:9572f7cdcee8591948c2963463447a53466950b3fc15a247fcad1917ca215a2f
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.
(amd64)
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:
https://hub.docker.com/

For more examples and ideas, visit:
https://docs.docker.com/get-started/

安装完成！

5、将普通用户加入到docker组

sudo groupadd docker
sudo gpasswd -a ${USER} docker