add docker install

install_docker.sh

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+#!/bin/bash
+#####		CentOS 7安装Docker		#####
+
+cd
+mkdir temp
+cd temp
+
+#下载
+wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.3.9-3.1.el7.x86_64.rpm
+wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-19.03.9-3.el7.x86_64.rpm
+wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-cli-19.03.9-3.el7.x86_64.rpm
+
+#安装
+yum -y install containerd.io-1.3.9-3.1.el7.x86_64.rpm
+yum -y install docker-ce-19.03.9-3.el7.x86_64.rpm
+yum -y install docker-ce-cli-19.03.9-3.el7.x86_64.rpm
+
+#启动docker
+systemctl start docker
+#开机启动
+systemctl enable docker
+
+echo '----------------------------------------'
+
+#运行一个hello word
+docker run hello-world