docker安装过程中出现的报错解决方法？

1、安装docker报Requires: container-selinux >= 2.9

原因：container-selinux版本低或者是没安装的原因

解决方式：
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-7.repo
yum install epel-release
yum makecache
yum install container-selinux

2、安装docker-compose时报错
“ImportError: 'module' object has no attribute 'check_specifier'”
原因：setuptools版本问题
解决方式：
升级setuptools到30.1.0版本以上版本
pip install --upgrade setuptools

3、安装docker-compose时报错
DEPRECATION: Python 2.7 will reach the end of its life on January 1st,

2020. Please upgrade your Python as Python 2.7 won't be maintained
      after that date. A future version of pip will drop support for Python
      2.7.

原因： python2.7提示升级
解决方式：
pip install -i https://pypi.douban.com/simple docker-compose