centos 7, @oraclelinux 7 & ibm red hat 7 docker install

# subscription-manager repos --enable rhel-7-server-extras-rpms
# subscription-manager repos --enable rhel-7-server-optional-rpms
# subscription-manager repos --enable rhel-7-server-supplementary-rpms
# subscription-manager repos --enable rhel-7-server-devtools-rpms
# subscription-manager repos --enable rhel-server-rhscl-7-rpms

# yum update

# yum install docker

# systemctl enable --now docker.service