centos 7.6 install the latest version docker 19.03

systemctl stop docker

rpm -qa | grep docker

See that delete the 
yum erase docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \

find /etc/systemd -name '*docker*' -exec rm -f {} \;
find /lib/systemd -name '*docker*' -exec rm -f {} \;

# Delete the existing image before and container 
rm -rf / var / lib / docker  

rm -rf /var/run/docker  
yum install -y yum-utils  device-mapper-persistent-data lvm2

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo 
here if there is an error, python version upgrades lead to 
see python2 version of the location where the modification yum- python2 position to the first row of the config-manager. 
whereis python2

yum list docker-ce --showduplicates | sort -r

yum install docker-ce -y

systemctl start docker
systemctl enable docker

docker version  
the current version is 19.03