root@localhost ~]# sudo yum-config-manager \  >   --add-repo \ >   https://download.docker.com/linux/centos/docker-ce.repo >   Loaded plugins: 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 >   [root@localhost ~]# vim /usr/lib/python2.7/site-packages/yum/misc.py >   [root@localhost ~]# sudo yum-config-manager   --add-repo  https://download.docker.com/linux/centos/docker-ce.repo >   Loaded plugins: fastestmirror >   [root@localhost ~]# sudo yum install docker-ce docker-ce-cli containerd.io  >   Loaded plugins: fastestmirror >   Loading mirror speeds from cached hostfile >   epel/x86_64/metalink                                                                                        | 9.8 kB  00:00:00        * base: mirrors.cqu.edu.cn 

报错解决方法
vim /usr/lib/python2.7/site-packages/yum/misc.py
import sys
reload(sys)
sys.setdefaultencoding(‘utf8’)

配置国内加速
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-‘EOF’
{
“registry-mirrors”: [“https://82m9ar63.mirror.aliyuncs.com”]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

重启失败，原因在处理/etc/docker/daemon.json的时候没有缩进，

[root@localhost ~]# cat /etc/docker/daemon.json
{
“registry-mirrors”: [“https://82m9ar63.mirror.aliyuncs.com”]
}
[root@localhost ~]#
重新配置缩进之后，重启成功
sudo systemctl daemon-reload
sudo systemctl restart docker