kubespray/roles/kernel-upgrade/tasks/centos-7.yml

---

- name: install ELRepo key
  rpm_key: state=present key='{{ elrepo_key_url }}'

- name: install elrepo repository
  yum:
    name: '{{elrepo_url}}'
    state: present

- name: upgrade kernel
  yum: name={{elrepo_kernel_package}} state=present enablerepo=elrepo-kernel
  register: upgrade

- name: change default grub entry
  lineinfile:
    dest: '/etc/default/grub'
    regexp: '^GRUB_DEFAULT=.*'
    line: 'GRUB_DEFAULT=0'
  when: upgrade.changed
  register: grub_entry

- name: re-generate grub-config
  command: grub2-mkconfig -o /boot/grub2/grub.cfg
  when: upgrade.changed and grub_entry.changed

- include: reboot.yml
  when: upgrade.changed