docker upgrade on Centos

1, view scalable version Version
yum List Docker-ce --showduplicates | the Sort -r

2, according to the version upgrade version
sudo yum install docker-ce- <VERSION STRING>

例如：
sudo yum install docker-ce-18.06.1.ce-3.el7
sudo yum install docker-ce-18.03.1.ce-1.el7.centos