CentOS-7安装Dockers
1.安装docker
```bash
yum install -y yum-utils device-mapper-persistent-data lvm2
```
2.设置yum源
```bash
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
```
3.查看可用版本
```bash
yum list docker-ce --showduplicates | sort -r
```
4.安装docker
```bash
yum -y install docker-ce-18.03.1.ce
```
5.启动docker并设置开机自启
```bash
systemctl start docker
systemctl enable docker
```
6.安装docker-compose
```bash
yum install -y epel-release
yum install -y python-pip
pip install docker-compose
```
7.安装docker-machine
```bash
base=
curl -L
```
8. 之前的安装方法
```bash
yum remove docker docker-common docker-selinux docker-engine # 卸载旧版本
yum install -y yum-utils device-mapper-persistent-data lvm2 # 安装需要的软件包, yum-util 提供yum-config-manager功能,另两个是devicemapper驱动依赖
# 设置一个yum源,下面两个都可用
yum-config-manager --add-repo http://download.docker.com/linux/centos/docker-ce.repo # (中央仓库)
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo # (阿里仓库)
yum list docker-ce --showduplicates | sort -r # 查看可用版本
yum -y install docker-ce-18.03.1.ce # 选择一个版本并安装
# 可能会出现错误,需安装:
yum erase podman buildah
sudo dnf install container-selinux
# 启动 Docker 并设置开机自启
systemctl start docker
systemctl enable docker
```