配置远程仓库时执行命令：
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
报错：
已加载插件：fastestmirror
/usr/lib/python2.7/site-packages/yum/misc.py:133: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
return lambda s: s.lower() == pat
希望大神帮忙解决解决。。。
换163或者阿里源吧，连国外源很不稳定的
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo