Docker installation (centos7)

#!/bin/bash
#Docker installation (centos7)
echo "update"
yum -y update
echo "install dependencies"
sudo yum -y install yum-utils \
  device-mapper-persistent-data \
  lvm2
echo "add docker repo"
sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
echo "install,start and enable docker"
yum -y install docker-ce && systemctl start docker && systemctl enable docker