echo "install docker required packages"
yum install -y yum-utils
 
echo "add repo"
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
 
echo "install docker"
yum -y install docker-ce
 
echo "start docker"
systemctl start docker
 
echo "enable docker at startup"
systemctl enable docker