shell一键安装docker，亲测有效

docker网上的安装方法有很多，一步步来做很麻烦，而且中间可能会出现各种错误，现在我就用shell写一个脚本，一键安装docker，方便快捷。
废话不多说，直接上代码。
这个shell脚本我测试过了，可以使用。

#安装docker
echo "========添加阿里云镜像加速器============="
mkdir -p /etc/docker
touch /etc/docker/daemon.json
echo "{"registry-mirrors": ["http://hub-mirror.c.163.com"] }" > /etc/docker/daemon.json
echo "========安装gcc============"
 yum -y install gcc
echo “===========安装gcc-c++=============”
yum -y install gcc-c++
gcc -v
echo "=============安装需要的软件包=================="
 yum install -y yum-utils device-mapper-persistent-data lvm2
echo "==================设置stable镜像仓库========================"
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
echo "======================更新yum软件包索引==============================="
yum makecache fast
echo "=======================安装docker ce=============================="
yum -y install docker-ce
rm -rf /etc/docker/daemon.json
echo "===============查看docker版本==========================="
docker version

当你看到如下内容时候说明安装成功了

===============查看docker版本===========================
Client: Docker Engine - Community
 Version:           19.03.5
 API version:       1.40
 Go version:        go1.12.12
 Git commit:        633a0ea
 Built:             Wed Nov 13 07:25:41 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.5
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.12
  Git commit:       633a0ea
  Built:            Wed Nov 13 07:24:18 2019
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.10
  GitCommit:        b34a5c8af56e510852c35414db4c1f4fa6172339
 runc:
  Version:          1.0.0-rc8+dev
  GitCommit:        3e425f80a8c931f88e6d94a8c831b9d5aa481657
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

然后就可以开启docker服务了

service docker start

ok，一切搞定。