Switch disable hugepages svc to systemd OPS-2205

playbooks/roles/mongo_3_2/files/disable-transparent-hugepages.conf

-description     "set transparent hugepage to never"
-
-start on starting mongod
-task
-
-script
-  echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled
-  echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag
-end script

playbooks/roles/mongo_3_2/files/etc/systemd/system/disable-transparent-hugepages.service

+[Unit]
+Description="Disable Transparent Hugepage before MongoDB boots"
+Before=mongod.service
+
+[Service]
+Type=oneshot
+ExecStart=/bin/bash -c 'echo never > /sys/kernel/mm/transparent_hugepage/enabled'
+ExecStart=/bin/bash -c 'echo never > /sys/kernel/mm/transparent_hugepage/defrag'
+
+[Install]
+RequiredBy=mongod.service

playbooks/roles/mongo_3_2/tasks/main.yml

 ---
-- name: disable transparent huge pages on startup (http://docs.mongodb.org/manual/tutorial/transparent-huge-pages/)
+- name: Add disable transparent huge pages systemd service (http://docs.mongodb.org/manual/tutorial/transparent-huge-pages/)
   copy:
-    src: disable-transparent-hugepages.conf
-    dest: /etc/init/disable-transparent-hugepages.conf
+    src:  etc/systemd/system/disable-transparent-hugepages.service
+    dest: "/etc/systemd/system/disable-transparent-hugepages.service"
     owner: root
     group: root
-    mode: 0755
+    mode: 0644
   tags:
     - "hugepages"
     - "install"
     - "install:system-requirements"
 
-- name: disable transparent huge pages
+- name: Enable/start disable transparent huge pages service (http://docs.mongodb.org/manual/tutorial/transparent-huge-pages/)
   service:
     name: disable-transparent-hugepages
     enabled: yes