Add kernel upgrade for CentOS

roles/kernel-upgrade/tasks/reboot.yml

@@ -0,0 +1,30 @@
+---
+
+# Reboot the machine gets more complicated as we want to support bastion hosts. A simple wait_for task would not work
+# as we can not directly reach the hosts (except the bastion). In case a basion is used, we first check for it to come
+# back. After it is back, we check for all the hosts by delegating to the bastion.
+
+- name: Rebooting server
+  shell: nohup bash -c "sleep 5 && shutdown -r now 'Reboot required for updated kernel'" &
+
+- name: Wait for some seconds
+  pause: seconds=10
+
+- set_fact:
+    is_bastion: "{{ inventory_hostname == 'bastion' }}"
+    wait_for_delegate: "localhost"
+- set_fact:
+    wait_for_delegate: "{{hostvars['bastion']['ansible_ssh_host']}}"
+  when: "{{ 'bastion' in groups['all'] }}"
+
+- name: wait for bastion to come back
+  wait_for: host={{ ansible_ssh_host }} port=22 delay=10 timeout=300
+  become: false
+  delegate_to: localhost
+  when: "is_bastion"
+
+- name: waiting for server to come back (using bastion if necessary)
+  wait_for: host={{ ansible_ssh_host }} port=22 delay=10 timeout=300
+  become: false
+  delegate_to: "{{ wait_for_delegate }}"
+  when: "not is_bastion"