Description of problem: At least one master should be choosed in atomic-openshift-installer Version-Release number of selected component (if applicable): atomic-openshift-utils-3.0.33-1.git.0.bb1f8aa.el7aos.noarch How reproducible: Always Steps to Reproduce: 1.Install two nodes by atomic-openshift-installer *** Installation Summary *** Hosts: - 10.66.79.137 - OpenShift Node (Dedicated) - 10.66.79.148 - OpenShift Node (Dedicated) Total OpenShift Masters: 0 Total OpenShift Nodes: 2 Actual results: TASK: [set_fact ] ************************************************************* fatal: [localhost] => Failed to template {{ hostvars | oo_select_keys(groups['oo_masters_to_config']) | oo_haproxy_backend_masters }}: |failed expects first param is a list Expected results: It's necessary to choose one master at least for user in atomic-openshift-installer, or throw exception about at least one master should be input by atomic-openshift-installer. Additional info: