Merge pull request #4530 from sdodson/node-dns

Utilize node dns services

21 files changed, 137 insertions, 53 deletions

diff --git a/roles/openshift_node/tasks/systemd_units.yml b/roles/openshift_node/tasks/systemd_units.yml
index e3ce5df3d..2ccc28461 100644
--- a/roles/openshift_node/tasks/systemd_units.yml
+++ b/roles/openshift_node/tasks/systemd_units.yml
@@ -34,7 +34,7 @@
 - name: Install Node service file
   template:
     dest: "/etc/systemd/system/{{ openshift.common.service_type }}-node.service"
-    src: "{{ openshift.common.service_type }}-node.service.j2"
+    src: "node.service.j2"
   register: install_node_result
   when: not openshift.common.is_containerized | bool
   notify:
diff --git a/roles/openshift_node/templates/atomic-openshift-node.service.j2 b/roles/openshift_node/templates/atomic-openshift-node.service.j2
deleted file mode 100644
index 80232094a..000000000
--- a/roles/openshift_node/templates/atomic-openshift-node.service.j2
+++ /dev/null
@@ -1,22 +0,0 @@
-[Unit]
-Description=Atomic OpenShift Node
-After={{ openshift.docker.service_name }}.service
-After=openvswitch.service
-Wants={{ openshift.docker.service_name }}.service
-Documentation=https://github.com/openshift/origin
-
-[Service]
-Type=notify
-EnvironmentFile=/etc/sysconfig/atomic-openshift-node
-Environment=GOTRACEBACK=crash
-ExecStart=/usr/bin/openshift start node --config=${CONFIG_FILE} $OPTIONS
-LimitNOFILE=65536
-LimitCORE=infinity
-WorkingDirectory=/var/lib/origin/
-SyslogIdentifier=atomic-openshift-node
-Restart=always
-RestartSec=5s
-OOMScoreAdjust=-999
-
-[Install]
-WantedBy=multi-user.target
diff --git a/roles/openshift_node/templates/node.service.j2 b/roles/openshift_node/templates/node.service.j2
new file mode 100644
index 000000000..d4f0b7762
--- /dev/null
+++ b/roles/openshift_node/templates/node.service.j2
@@ -0,0 +1,30 @@
+[Unit]
+Description=OpenShift Node
+After={{ openshift.docker.service_name }}.service
+Wants=openvswitch.service
+After=ovsdb-server.service
+After=ovs-vswitchd.service
+Wants={{ openshift.docker.service_name }}.service
+Documentation=https://github.com/openshift/origin
+Requires=dnsmasq.service
+After=dnsmasq.service
+
+[Service]
+Type=notify
+EnvironmentFile=/etc/sysconfig/{{ openshift.common.service_type }}-node
+Environment=GOTRACEBACK=crash
+ExecStartPre=/usr/bin/cp /etc/origin/node/node-dnsmasq.conf /etc/dnsmasq.d/
+ExecStartPre=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:/in-addr.arpa/127.0.0.1,/{{ openshift.common.dns_domain }}/127.0.0.1
+ExecStopPost=/usr/bin/rm /etc/dnsmasq.d/node-dnsmasq.conf
+ExecStopPost=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:
+ExecStart=/usr/bin/openshift start node --config=${CONFIG_FILE} $OPTIONS
+LimitNOFILE=65536
+LimitCORE=infinity
+WorkingDirectory=/var/lib/origin/
+SyslogIdentifier={{ openshift.common.service_type }}-node
+Restart=always
+RestartSec=5s
+OOMScoreAdjust=-999
+
+[Install]
+WantedBy=multi-user.target
diff --git a/roles/openshift_node/templates/node.yaml.v1.j2 b/roles/openshift_node/templates/node.yaml.v1.j2
index f2f929232..351c8c9f6 100644
--- a/roles/openshift_node/templates/node.yaml.v1.j2
+++ b/roles/openshift_node/templates/node.yaml.v1.j2
@@ -1,5 +1,9 @@
 allowDisabledDocker: false
 apiVersion: v1
+{% if openshift.common.version_gte_3_6 %}
+dnsBindAddress: 127.0.0.1:53
+dnsRecursiveResolvConf: /etc/origin/node/resolv.conf
+{% endif %}
 dnsDomain: {{ openshift.common.dns_domain }}
 {% if 'dns_ip' in openshift.node %}
 dnsIP: {{ openshift.node.dns_ip }}
diff --git a/roles/openshift_node/templates/openshift.docker.node.service b/roles/openshift_node/templates/openshift.docker.node.service
index cd0a1a60b..639b6f6c8 100644
--- a/roles/openshift_node/templates/openshift.docker.node.service
+++ b/roles/openshift_node/templates/openshift.docker.node.service
@@ -12,14 +12,20 @@ After=ovs-vswitchd.service
 Wants={{ openshift.common.service_type }}-master.service
 Requires={{ openshift.common.service_type }}-node-dep.service
 After={{ openshift.common.service_type }}-node-dep.service
+Requires=dnsmasq.service
+After=dnsmasq.service
 
 [Service]
 EnvironmentFile=/etc/sysconfig/{{ openshift.common.service_type }}-node
 EnvironmentFile=/etc/sysconfig/{{ openshift.common.service_type }}-node-dep
 ExecStartPre=-/usr/bin/docker rm -f {{ openshift.common.service_type }}-node
+ExecStartPre=/usr/bin/cp /etc/origin/node/node-dnsmasq.conf /etc/dnsmasq.d/
+ExecStartPre=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:/in-addr.arpa/127.0.0.1,/{{ openshift.common.dns_domain }}/127.0.0.1
 ExecStart=/usr/bin/docker run --name {{ openshift.common.service_type }}-node --rm --privileged --net=host --pid=host --env-file=/etc/sysconfig/{{ openshift.common.service_type }}-node -v /:/rootfs:ro,rslave -e CONFIG_FILE=${CONFIG_FILE} -e OPTIONS=${OPTIONS} -e HOST=/rootfs -e HOST_ETC=/host-etc -v {{ openshift.common.data_dir }}:{{ openshift.common.data_dir }}{{ ':rslave' if openshift.docker.gte_1_10 | default(False) | bool else '' }} -v {{ openshift.common.config_base }}/node:{{ openshift.common.config_base }}/node {% if openshift_cloudprovider_kind | default('') != '' -%} -v {{ openshift.common.config_base }}/cloudprovider:{{ openshift.common.config_base}}/cloudprovider {% endif -%} -v /etc/localtime:/etc/localtime:ro -v /etc/machine-id:/etc/machine-id:ro -v /run:/run -v /sys:/sys:rw -v /sys/fs/cgroup:/sys/fs/cgroup:rw -v /usr/bin/docker:/usr/bin/docker:ro -v /var/lib/docker:/var/lib/docker -v /lib/modules:/lib/modules -v /etc/origin/openvswitch:/etc/openvswitch -v /etc/origin/sdn:/etc/openshift-sdn -v /var/lib/cni:/var/lib/cni -v /etc/systemd/system:/host-etc/systemd/system -v /var/log:/var/log -v /dev:/dev $DOCKER_ADDTL_BIND_MOUNTS -v /etc/pki:/etc/pki:ro {{ openshift.node.node_image }}:${IMAGE_VERSION}
 ExecStartPost=/usr/bin/sleep 10
 ExecStop=/usr/bin/docker stop {{ openshift.common.service_type }}-node
+ExecStopPost=/usr/bin/rm /etc/dnsmasq.d/node-dnsmasq.conf
+ExecStopPost=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:
 SyslogIdentifier={{ openshift.common.service_type }}-node
 Restart=always
 RestartSec=5s
diff --git a/roles/openshift_node/templates/origin-node.service.j2 b/roles/openshift_node/templates/origin-node.service.j2
deleted file mode 100644
index 8047301e6..000000000
--- a/roles/openshift_node/templates/origin-node.service.j2
+++ /dev/null
@@ -1,21 +0,0 @@
-[Unit]
-Description=Origin Node
-After={{ openshift.docker.service_name }}.service
-Wants={{ openshift.docker.service_name }}.service
-Documentation=https://github.com/openshift/origin
-
-[Service]
-Type=notify
-EnvironmentFile=/etc/sysconfig/origin-node
-Environment=GOTRACEBACK=crash
-ExecStart=/usr/bin/openshift start node --config=${CONFIG_FILE} $OPTIONS
-LimitNOFILE=65536
-LimitCORE=infinity
-WorkingDirectory=/var/lib/origin/
-SyslogIdentifier=origin-node
-Restart=always
-RestartSec=5s
-OOMScoreAdjust=-999
-
-[Install]
-WantedBy=multi-user.target
diff --git a/roles/openshift_node_dnsmasq/defaults/main.yml b/roles/openshift_node_dnsmasq/defaults/main.yml
new file mode 100644
index 000000000..ed97d539c
--- /dev/null
+++ b/roles/openshift_node_dnsmasq/defaults/main.yml
@@ -0,0 +1 @@
+---
diff --git a/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh b/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh
index c68073a10..924226d09 100755
--- a/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh
+++ b/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh
@@ -45,13 +45,15 @@ if [[ $2 =~ ^(up|dhcp4-change|dhcp6-change)$ ]]; then
   def_route_int=$(/sbin/ip route get to ${def_route} | awk '{print $3}')
   def_route_ip=$(/sbin/ip route get to ${def_route} | awk '{print $5}')
   if [[ ${DEVICE_IFACE} == ${def_route_int} && \
-       -n "${IP4_NAMESERVERS}" ]]; then
+       -n "${IP4_NAMESERVERS}" && \
+       "${IP4_NAMESERVERS}" != "${def_route_ip}" ]]; then
     if [ ! -f /etc/dnsmasq.d/origin-dns.conf ]; then
       cat << EOF > /etc/dnsmasq.d/origin-dns.conf
 no-resolv
 domain-needed
 server=/cluster.local/172.30.0.1
 server=/30.172.in-addr.arpa/172.30.0.1
+enable-dbus
 EOF
       # New config file, must restart
       NEEDS_RESTART=1
@@ -89,13 +91,17 @@ EOF
       systemctl restart dnsmasq
     fi
 
-    # Only if dnsmasq is running properly make it our only nameserver
+    # Only if dnsmasq is running properly make it our only nameserver, copy
+    # original resolv.conf to /etc/origin/node/resolv.conf for node service to
+    # bypass dnsmasq
     if `systemctl -q is-active dnsmasq.service`; then
-      sed -e '/^nameserver.*$/d' /etc/resolv.conf > ${NEW_RESOLV_CONF}
-      echo "nameserver "${def_route_ip}"" >> ${NEW_RESOLV_CONF}
       if ! grep -q '99-origin-dns.sh' ${NEW_RESOLV_CONF}; then
           echo "# nameserver updated by /etc/NetworkManager/dispatcher.d/99-origin-dns.sh" >> ${NEW_RESOLV_CONF}
+          cp /etc/resolv.conf /etc/origin/node/resolv.conf
       fi
+      sed -e '/^nameserver.*$/d' /etc/resolv.conf > ${NEW_RESOLV_CONF}
+      echo "nameserver "${def_route_ip}"" >> ${NEW_RESOLV_CONF}
+
       if ! grep -q 'search.*cluster.local' ${NEW_RESOLV_CONF}; then
         sed -i '/^search/ s/$/ cluster.local/' ${NEW_RESOLV_CONF}
       fi
diff --git a/roles/openshift_node_dnsmasq/tasks/main.yml b/roles/openshift_node_dnsmasq/tasks/main.yml
index 3311f7006..d0221a94b 100644
--- a/roles/openshift_node_dnsmasq/tasks/main.yml
+++ b/roles/openshift_node_dnsmasq/tasks/main.yml
@@ -14,6 +14,17 @@
   package: name=dnsmasq state=installed
   when: not openshift.common.is_atomic | bool
 
+# this file is copied to /etc/dnsmasq.d/ when the node starts and is removed
+# when the node stops. A dbus-message is sent to dnsmasq to add the same entries
+# so that dnsmasq doesn't need to be restarted. Once we can use dnsmasq 2.77 or
+# newer we can use --server-file option to update the servers dynamically and
+# reload them by sending dnsmasq a SIGHUP. We write the file in case someone else
+# triggers a restart of dnsmasq but not a node restart.
+- name: Install node-dnsmasq.conf
+  template:
+    src: node-dnsmasq.conf.j2
+    dest: /etc/origin/node/node-dnsmasq.conf
+
 - name: Install dnsmasq configuration
   template:
     src: origin-dns.conf.j2
diff --git a/roles/openshift_node_dnsmasq/templates/node-dnsmasq.conf.j2 b/roles/openshift_node_dnsmasq/templates/node-dnsmasq.conf.j2
new file mode 100644
index 000000000..3caa3bd4a
--- /dev/null
+++ b/roles/openshift_node_dnsmasq/templates/node-dnsmasq.conf.j2
@@ -0,0 +1,2 @@
+server=/in-addr.arpa/127.0.0.1
+server=/{{ openshift.common.dns_domain }}/127.0.0.1
diff --git a/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2 b/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2
index 8bae9aaac..779b4d2f5 100644
--- a/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2
+++ b/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2
@@ -1,5 +1,7 @@
 no-resolv
 domain-needed
-server=/{{ openshift.common.dns_domain }}/{{ openshift.common.kube_svc_ip }}
 no-negcache
 max-cache-ttl=1
+enable-dbus
+bind-interfaces
+listen-address={{ ansible_default_ipv4.address }}
diff --git a/roles/openshift_node_upgrade/README.md b/roles/openshift_node_upgrade/README.md
index 66bce38ec..8b388cc6a 100644
--- a/roles/openshift_node_upgrade/README.md
+++ b/roles/openshift_node_upgrade/README.md
@@ -88,6 +88,7 @@ Including an example of how to use your role (for instance, with variables passe
   roles:
   - openshift_facts
   - docker
+  - openshift_node_dnsmasq
   - openshift_node_upgrade
 
   post_tasks:
diff --git a/roles/openshift_node_upgrade/defaults/main.yml b/roles/openshift_node_upgrade/defaults/main.yml
new file mode 100644
index 000000000..ed97d539c
--- /dev/null
+++ b/roles/openshift_node_upgrade/defaults/main.yml
@@ -0,0 +1 @@
+---
diff --git a/roles/openshift_node_upgrade/tasks/main.yml b/roles/openshift_node_upgrade/tasks/main.yml
index 8eaa68cc9..9807aa9a3 100644
--- a/roles/openshift_node_upgrade/tasks/main.yml
+++ b/roles/openshift_node_upgrade/tasks/main.yml
@@ -133,6 +133,17 @@
   - ansible_selinux is defined
   - ansible_selinux.status == 'enabled'
 
+- name: Apply 3.6 dns config changes
+  yedit:
+    src: /etc/origin/node/node-config.yaml
+    key: "{{ item.key }}"
+    value: "{{ item.value }}"
+  with_items:
+  - key: "dnsBindAddress"
+    value: "127.0.0.1:53"
+  - key: "dnsRecursiveResolvConf"
+    value: "/etc/origin/node/resolv.conf"
+
 # Restart all services
 - include: restart.yml
 
diff --git a/roles/openshift_node_upgrade/tasks/rpm_upgrade.yml b/roles/openshift_node_upgrade/tasks/rpm_upgrade.yml
index 06a2d16ba..a998acf21 100644
--- a/roles/openshift_node_upgrade/tasks/rpm_upgrade.yml
+++ b/roles/openshift_node_upgrade/tasks/rpm_upgrade.yml
@@ -16,7 +16,7 @@
 - name: Install Node service file
   template:
     dest: "/etc/systemd/system/{{ openshift.common.service_type }}-node.service"
-    src: "{{ openshift.common.service_type }}-node.service.j2"
+    src: "node.service.j2"
   register: l_node_unit
 
 # NOTE: This is needed to make sure we are using the correct set
diff --git a/roles/openshift_node_upgrade/templates/atomic-openshift-node.service.j2 b/roles/openshift_node_upgrade/templates/atomic-openshift-node.service.j2
deleted file mode 120000
index 6041fb13a..000000000
--- a/roles/openshift_node_upgrade/templates/atomic-openshift-node.service.j2
+++ /dev/null
@@ -1 +0,0 @@
-../../openshift_node/templates/atomic-openshift-node.service.j2
\ No newline at end of file
diff --git a/roles/openshift_node_upgrade/templates/node.service.j2 b/roles/openshift_node_upgrade/templates/node.service.j2
new file mode 100644
index 000000000..d4f0b7762
--- /dev/null
+++ b/roles/openshift_node_upgrade/templates/node.service.j2
@@ -0,0 +1,30 @@
+[Unit]
+Description=OpenShift Node
+After={{ openshift.docker.service_name }}.service
+Wants=openvswitch.service
+After=ovsdb-server.service
+After=ovs-vswitchd.service
+Wants={{ openshift.docker.service_name }}.service
+Documentation=https://github.com/openshift/origin
+Requires=dnsmasq.service
+After=dnsmasq.service
+
+[Service]
+Type=notify
+EnvironmentFile=/etc/sysconfig/{{ openshift.common.service_type }}-node
+Environment=GOTRACEBACK=crash
+ExecStartPre=/usr/bin/cp /etc/origin/node/node-dnsmasq.conf /etc/dnsmasq.d/
+ExecStartPre=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:/in-addr.arpa/127.0.0.1,/{{ openshift.common.dns_domain }}/127.0.0.1
+ExecStopPost=/usr/bin/rm /etc/dnsmasq.d/node-dnsmasq.conf
+ExecStopPost=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:
+ExecStart=/usr/bin/openshift start node --config=${CONFIG_FILE} $OPTIONS
+LimitNOFILE=65536
+LimitCORE=infinity
+WorkingDirectory=/var/lib/origin/
+SyslogIdentifier={{ openshift.common.service_type }}-node
+Restart=always
+RestartSec=5s
+OOMScoreAdjust=-999
+
+[Install]
+WantedBy=multi-user.target
diff --git a/roles/openshift_node_upgrade/templates/openshift.docker.node.service b/roles/openshift_node_upgrade/templates/openshift.docker.node.service
index 2a099301a..639b6f6c8 100644
--- a/roles/openshift_node_upgrade/templates/openshift.docker.node.service
+++ b/roles/openshift_node_upgrade/templates/openshift.docker.node.service
@@ -6,18 +6,26 @@ PartOf={{ openshift.docker.service_name }}.service
 Requires={{ openshift.docker.service_name }}.service
 {% if openshift.common.use_openshift_sdn %}
 Wants=openvswitch.service
+After=ovsdb-server.service
+After=ovs-vswitchd.service
 {% endif %}
 Wants={{ openshift.common.service_type }}-master.service
 Requires={{ openshift.common.service_type }}-node-dep.service
 After={{ openshift.common.service_type }}-node-dep.service
+Requires=dnsmasq.service
+After=dnsmasq.service
 
 [Service]
 EnvironmentFile=/etc/sysconfig/{{ openshift.common.service_type }}-node
 EnvironmentFile=/etc/sysconfig/{{ openshift.common.service_type }}-node-dep
 ExecStartPre=-/usr/bin/docker rm -f {{ openshift.common.service_type }}-node
-ExecStart=/usr/bin/docker run --name {{ openshift.common.service_type }}-node --rm --privileged --net=host --pid=host --env-file=/etc/sysconfig/{{ openshift.common.service_type }}-node -v /:/rootfs:ro,rslave -e CONFIG_FILE=${CONFIG_FILE} -e OPTIONS=${OPTIONS} -e HOST=/rootfs -e HOST_ETC=/host-etc -v {{ openshift.common.data_dir }}:{{ openshift.common.data_dir }}{{ ':rslave' if openshift.docker.gte_1_10 | default(False) | bool else '' }} -v {{ openshift.common.config_base }}/node:{{ openshift.common.config_base }}/node {% if openshift_cloudprovider_kind | default('') != '' -%} -v {{ openshift.common.config_base }}/cloudprovider:{{ openshift.common.config_base}}/cloudprovider {% endif -%} -v /etc/localtime:/etc/localtime:ro -v /etc/machine-id:/etc/machine-id:ro -v /run:/run -v /sys:/sys:rw -v /sys/fs/cgroup:/sys/fs/cgroup:rw -v /usr/bin/docker:/usr/bin/docker:ro -v /var/lib/docker:/var/lib/docker -v /lib/modules:/lib/modules -v /etc/origin/openvswitch:/etc/openvswitch -v /etc/origin/sdn:/etc/openshift-sdn -v /var/lib/cni:/var/lib/cni -v /etc/systemd/system:/host-etc/systemd/system -v /var/log:/var/log -v /dev:/dev $DOCKER_ADDTL_BIND_MOUNTS {{ openshift.node.node_image }}:${IMAGE_VERSION}
+ExecStartPre=/usr/bin/cp /etc/origin/node/node-dnsmasq.conf /etc/dnsmasq.d/
+ExecStartPre=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:/in-addr.arpa/127.0.0.1,/{{ openshift.common.dns_domain }}/127.0.0.1
+ExecStart=/usr/bin/docker run --name {{ openshift.common.service_type }}-node --rm --privileged --net=host --pid=host --env-file=/etc/sysconfig/{{ openshift.common.service_type }}-node -v /:/rootfs:ro,rslave -e CONFIG_FILE=${CONFIG_FILE} -e OPTIONS=${OPTIONS} -e HOST=/rootfs -e HOST_ETC=/host-etc -v {{ openshift.common.data_dir }}:{{ openshift.common.data_dir }}{{ ':rslave' if openshift.docker.gte_1_10 | default(False) | bool else '' }} -v {{ openshift.common.config_base }}/node:{{ openshift.common.config_base }}/node {% if openshift_cloudprovider_kind | default('') != '' -%} -v {{ openshift.common.config_base }}/cloudprovider:{{ openshift.common.config_base}}/cloudprovider {% endif -%} -v /etc/localtime:/etc/localtime:ro -v /etc/machine-id:/etc/machine-id:ro -v /run:/run -v /sys:/sys:rw -v /sys/fs/cgroup:/sys/fs/cgroup:rw -v /usr/bin/docker:/usr/bin/docker:ro -v /var/lib/docker:/var/lib/docker -v /lib/modules:/lib/modules -v /etc/origin/openvswitch:/etc/openvswitch -v /etc/origin/sdn:/etc/openshift-sdn -v /var/lib/cni:/var/lib/cni -v /etc/systemd/system:/host-etc/systemd/system -v /var/log:/var/log -v /dev:/dev $DOCKER_ADDTL_BIND_MOUNTS -v /etc/pki:/etc/pki:ro {{ openshift.node.node_image }}:${IMAGE_VERSION}
 ExecStartPost=/usr/bin/sleep 10
 ExecStop=/usr/bin/docker stop {{ openshift.common.service_type }}-node
+ExecStopPost=/usr/bin/rm /etc/dnsmasq.d/node-dnsmasq.conf
+ExecStopPost=/usr/bin/dbus-send --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetDomainServers array:string:
 SyslogIdentifier={{ openshift.common.service_type }}-node
 Restart=always
 RestartSec=5s
diff --git a/roles/openshift_node_upgrade/templates/origin-node.service.j2 b/roles/openshift_node_upgrade/templates/origin-node.service.j2
deleted file mode 120000
index 79c45a303..000000000
--- a/roles/openshift_node_upgrade/templates/origin-node.service.j2
+++ /dev/null
@@ -1 +0,0 @@
-../../openshift_node/templates/origin-node.service.j2
\ No newline at end of file
diff --git a/roles/openshift_sanitize_inventory/tasks/main.yml b/roles/openshift_sanitize_inventory/tasks/main.yml
index f15dc16d1..59ce505d3 100644
--- a/roles/openshift_sanitize_inventory/tasks/main.yml
+++ b/roles/openshift_sanitize_inventory/tasks/main.yml
@@ -46,3 +46,7 @@
     msg: |-
       openshift_release is "{{ openshift_release }}" which is not a valid version string.
       Please set it to a version string like "3.4".
+
+- include: unsupported.yml
+  when:
+    - not openshift_enable_unsupported_configurations | default(false) | bool
diff --git a/roles/openshift_sanitize_inventory/tasks/unsupported.yml b/roles/openshift_sanitize_inventory/tasks/unsupported.yml
new file mode 100644
index 000000000..24e44ea85
--- /dev/null
+++ b/roles/openshift_sanitize_inventory/tasks/unsupported.yml
@@ -0,0 +1,12 @@
+---
+# This task list checks for unsupported configurations. Values here should yield
+# a partially functioning cluster but would not be supported for production use.
+
+- name: Ensure that openshift_use_dnsmasq is true
+  when:
+  - not openshift_use_dnsmasq | default(true) | bool
+  fail:
+    msg: |-
+      Starting in 3.6 openshift_use_dnsmasq must be true or critical features
+      will not function. This also means that NetworkManager must be installed
+      enabled and responsible for management of the primary interface.