Document URL: https://access.redhat.com/documentation/en/openshift-enterprise/version-3.1/installation-and-configuration/#system-requirements Section Number and Name: 2.2.2 Describe the issue: The system requirements for the masters hosts do not list docker as a dependency. Suggestions for improvement: Add docker as a dependency like in the nodes requirements. Additional information: Section 2.2.4.1 install docker on both masters and nodes.
https://docs.openshift.com/enterprise/latest/install_config/install/prerequisites.html In the most current docs version, the requirement is listed in the Important box, and the rest of the prereq steps ensure that the right docker version is installed.