因为系统自带的repo中不带docker需要安装epel
rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
yum install -y docker-io
可能会安装失败，如果有问题直接源码安装
yum install https://get.docker.com/rpm/1.7.1/centos-6/RPMS/x86_64/docker-engine-1.7.1-1.el6.x86_64.rpm
yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install docker-ce docker-ce-cli containerd.io
yum list docker-ce --showduplicates | sort -r
yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io
systemctl start docker
docker version
目前仅支持以下３个64 bit的Ubuntu 版本，支持x86_64 和armhf (ARM)硬件架构。
sudo apt-get remove docker docker-engine docker-ce docker.io
sudo apt-get update
sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual
sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get -y install docker-ce
sudo docker run hello-world
出现报错（docker的版本和linux的内核版本不兼容），升级linux内核，执行下列命令，并重启
sudo apt-get install --install-recommends linux-generic-lts-xenial
sudo reboot
原文：https://www.cnblogs.com/luxiaojun/p/11959269.html