anisble update host and reboot if kernel updated

update-task.yml

- name: yum update
  yum: name=* state=latest

- name: Check for reboot hint.
  shell: if [ `rpm -q 'kernel' |sort --version-sort -r | head -n 1 | awk '{print $1}' | head -n 1` != kernel-`uname -r` ]; then echo "reboot"; else echo "no"; fi
  register: reboot_hint
  always_run: yes

- name: Rebooting ...
  shell: sleep 2 && shutdown -r now "yum kernel update applied"
  when: reboot_hint.stdout.find('reboot') != -1
  async: 1
  poll: 0
  ignore_errors: true

- name: Wait for server to restart
  local_action: wait_for host={{ inventory_hostname }} port=22 delay=1 timeout=300