yum list installed | grep docker #
yum -y remove docker名称
rm -rf docker路径
yum install https://get.docker.com/rpm/1.7.1/centos-6/RPMS/x86_64/docker-engine-1.7.1-1.el6.x86_64.rpm
sudo yum install docker-io
yum list installed | grep docker #
yum -y remove docker名称
rm -rf docker路径