Pass in and use first_master_ip as dnsIP for pre 3.1 nodes.

playbooks/common/openshift-cluster/scaleup.yml

@@ -3,6 +3,4 @@
 
 - include: ../openshift-node/config.yml
   vars:
-    osn_cluster_dns_domain: "{{ hostvars[groups.oo_first_master.0].openshift.dns.domain }}"
-    osn_cluster_dns_ip: "{{ hostvars[groups.oo_first_master.0].openshift.dns.ip }}"
     openshift_deployment_type: "{{ deployment_type }}"

playbooks/common/openshift-node/config.yml

@@ -158,8 +158,10 @@
   vars:
     sync_tmpdir: "{{ hostvars.localhost.mktemp.stdout }}"
     openshift_node_master_api_url: "{{ hostvars[groups.oo_first_master.0].openshift.master.api_url }}"
+    # TODO: Prefix flannel role variables.
     etcd_urls: "{{ hostvars[groups.oo_first_master.0].openshift.master.etcd_urls }}"
     embedded_etcd: "{{ hostvars[groups.oo_first_master.0].openshift.master.embedded_etcd }}"
+    openshift_node_first_master_ip: "{{ hostvars[groups.oo_first_master.0].openshift.common.ip }}"
   pre_tasks:
   - name: Ensure certificate directory exists
     file:

playbooks/gce/openshift-cluster/join_node.yml

@@ -45,5 +45,3 @@
     openshift_use_openshift_sdn: true
     openshift_node_labels: "{{ lookup('oo_option', 'openshift_node_labels') }} "
     os_sdn_network_plugin_name: "redhat/openshift-ovs-subnet"
-    osn_cluster_dns_domain: "{{ hostvars[groups.oo_first_master.0].openshift.dns.domain }}"
-    osn_cluster_dns_ip: "{{ hostvars[groups.oo_first_master.0].cluster_dns_ip }}"

roles/openshift_node/tasks/main.yml

@@ -14,7 +14,10 @@
       hostname: "{{ openshift_hostname | default(none) }}"
       public_hostname: "{{ openshift_public_hostname | default(none) }}"
       deployment_type: "{{ openshift_deployment_type }}"
-      dns_ip: "{{ openshift_dns_ip | default(openshift_master_cluster_vip | default(None, true), true) }}"
+      # TODO: Replace this with a lookup or filter plugin.
+      dns_ip: "{{ openshift_dns_ip
+                  | default(openshift_master_cluster_vip
+                  | default(None if openshift.common.version_greater_than_3_1_or_1_1 | bool else openshift_node_first_master_ip | default(None, true), true), true) }}"
   - role: node
     local_facts:
       annotations: "{{ openshift_node_annotations | default(none) }}"