sudo passwd root(设置root密码）
Ubuntu 14.04/16.04/18.04 安装docker
# step 1: 安装必要的一些系统工具
sudo apt-get update
sudo apt-get -y install apt-transport-https ca-certificates curl softwareproperties-common
# step 2: 安装GPG证书
curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key
add -
# Step 3: 写入软件源信息
sudo add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/dockerce/linux/ubuntu $(lsb_release -cs) stable"
# Step 4: 更新并安装Docker-CE
sudo apt-get -y update
sudo apt-get -y install docker-ce
# 安装指定版本的Docker-CE:
# Step 1: 查找Docker-CE的版本:
apt-cache madison docker-ce
docker-ce | 5:19.03.5~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:19.03.4~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:19.03.3~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:19.03.2~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:19.03.1~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:19.03.0~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.9~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.8~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.7~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.6~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.5~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.4~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.3~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.2~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.1~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 5:18.09.0~3-0~ubuntu-bionic | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 18.06.3~ce~3-0~ubuntu | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 18.06.2~ce~3-0~ubuntu | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 18.06.1~ce~3-0~ubuntu | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 18.06.0~ce~3-0~ubuntu | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 18.03.1~ce~3-0~ubuntu | https://mirrors.aliyun.com/dockerce/linux/ubuntu bionic/stable amd64 Packages
# Step 2: 安装指定版本的Docker-CE: (VERSION例如上面的5:17.03.1~ce-0~ubuntu-xenial)
sudo apt-get -y install docker-ce=[VERSION] docker-ce-cli=[VERSION]
#示例:指定版本安装
apt-get -y install docker-ce=5:18.09.9~3-0~ubuntu-bionic docker-cecli=5:18.09.9~3-0~ubuntu-bionic
删除docker
[root@ubuntu ~]#apt purge docker-ce
[root@ubuntu ~]#rm -rf /var/lib/docker