use ansible_service_mgr to detect init system

roles/kubernetes/master/tasks/main.yml

@@ -18,7 +18,7 @@
     src: "kube-apiserver.service.j2"
     dest: "/etc/systemd/system/kube-apiserver.service"
     backup: yes
-  when: init_system == "systemd"
+  when: ansible_service_mgr == "systemd"
   notify: restart kube-apiserver
 
 - name: install | Write kube-apiserver initd script
@@ -28,7 +28,7 @@
     owner: root
     mode: 0755
     backup: yes
-  when: init_system == "sysvinit" and ansible_os_family == "Debian"
+  when: ansible_service_mgr in ["sysvinit","upstart"] and ansible_os_family == "Debian"
 
 - name: Write kube-apiserver config file
   template:

roles/kubernetes/master/tasks/start.yml

@@ -4,7 +4,7 @@
 
 - name: reload systemd
   command: systemctl daemon-reload
-  when: init_system == "systemd" and restart_apimaster is defined and restart_apimaster == True
+  when: ansible_service_mgr == "systemd" and restart_apimaster is defined and restart_apimaster == True
 
 - name: reload kube-apiserver
   service:

roles/kubernetes/master/templates/kube-apiserver.j2

@@ -3,7 +3,7 @@
 #
 # The following values are used to configure the kube-apiserver
 
-{% if init_system == "sysvinit" %}
+{% if ansible_service_mgr in ["sysvinit","upstart"] %}
 # Logging directory
 KUBE_LOGGING="--log-dir={{ kube_log_dir }} --logtostderr=true"
 {% else %}
@@ -38,7 +38,7 @@ KUBE_TLS_CONFIG="--tls_cert_file={{ kube_cert_dir }}/apiserver.pem --tls_private
 # Add you own!
 KUBE_API_ARGS="--token_auth_file={{ kube_token_dir }}/known_tokens.csv --basic-auth-file={{ kube_users_dir }}/known_users.csv --service_account_key_file={{ kube_cert_dir }}/apiserver-key.pem"
 
-{% if init_system == "sysvinit" %}
+{% if ansible_service_mgr in ["sysvinit","upstart"] %}
 DAEMON_ARGS="$KUBE_LOGGING $KUBE_LOG_LEVEL $KUBE_ALLOW_PRIV $KUBE_API_PORT $KUBE_SERVICE_ADDRESSES \
 $KUBE_ETCD_SERVERS $KUBE_ADMISSION_CONTROL $KUBE_RUNTIME_CONFIG $KUBE_TLS_CONFIG $KUBE_API_ARGS"
 {% endif %}

roles/kubernetes/node/handlers/main.yml

@@ -1,7 +1,7 @@
 ---
 - name: reload systemd
   command: systemctl daemon-reload
-  when: init_system == "systemd"
+  when: ansible_service_mgr == "systemd"
 
 - name: restart kubelet
   command: /bin/true

roles/kubernetes/node/tasks/install.yml

@@ -1,17 +1,17 @@
 ---
 - name: install | Write kubelet systemd init file
   template: src=kubelet.service.j2 dest=/etc/systemd/system/kubelet.service backup=yes
-  when: init_system == "systemd"
+  when: ansible_service_mgr == "systemd"
   notify: restart kubelet
 
 - name: install | Write kubelet initd script
   template: src=deb-kubelet.initd.j2 dest=/etc/init.d/kubelet owner=root mode=0755 backup=yes
-  when: init_system == "sysvinit" and ansible_os_family == "Debian"
+  when: ansible_service_mgr in ["sysvinit","upstart"] and ansible_os_family == "Debian"
   notify: restart kubelet
 
 - name: install | Write kubelet initd script
   template: src=rh-kubelet.initd.j2 dest=/etc/init.d/kubelet owner=root mode=0755 backup=yes
-  when: init_system == "sysvinit" and ansible_os_family == "RedHat"
+  when: ansible_service_mgr in ["sysvinit","upstart"] and ansible_os_family == "RedHat"
   notify: restart kubelet
 
 - name: install | Install kubelet binary

roles/kubernetes/node/templates/kubelet.j2

@@ -1,4 +1,4 @@
-{% if init_system == "sysvinit" %}
+{% if ansible_service_mgr in ["sysvinit","upstart"] %}
 # Logging directory
 KUBE_LOGGING="--log-dir={{ kube_log_dir }} --logtostderr=true"
 {% else %}
@@ -30,7 +30,7 @@ DOCKER_SOCKET="--docker-endpoint=unix:/var/run/weave/weave.sock"
 {% endif %}
 # Should this cluster be allowed to run privileged docker containers
 KUBE_ALLOW_PRIV="--allow_privileged=true"
-{% if init_system == "sysvinit" %}
+{% if ansible_service_mgr in ["sysvinit","upstart"] %}
 DAEMON_ARGS="$KUBE_LOGGING $KUBE_LOG_LEVEL $KUBE_ALLOW_PRIV $KUBELET_API_SERVER $KUBELET_ADDRESS \
 $KUBELET_HOSTNAME $KUBELET_REGISTER_NODE $KUBELET_ARGS $DOCKER_SOCKET $KUBELET_ARGS $KUBELET_NETWORK_PLUGIN"
 {% endif %}

roles/kubernetes/preinstall/tasks/main.yml

@@ -15,24 +15,6 @@
       paths:
       - ../vars
 
-- name: "Identify init system"
-  shell: >
-    $(pgrep systemd > /dev/null && systemctl status network.target > /dev/null);
-    if [ $? -eq 0 ] ; then
-      echo systemd;
-    else
-      echo sysvinit;
-    fi
-  always_run: True
-  register: init_system_output
-  changed_when: False
-  tags: always
-
-- set_fact:
-    init_system: "{{ init_system_output.stdout }}"
-  always_run: True
-  tags: always
-
 - name: Create kubernetes config directory
   file:
     path: "{{ kube_config_dir }}"
@@ -56,7 +38,7 @@
     path: "{{ kube_log_dir }}"
     state: directory
     owner: kube
-  when: init_system == "sysvinit"
+  when: ansible_service_mgr in ["sysvinit","upstart"]
 
 - name: Create cni directories
   file: