In our previous step we updated Ubuntu on our Stack of NUCs.

Now we are going to create and run an Ansible playbook to check the CMOS battery health on the nodes. We are using /proc/driver/rtc instead of lm-sensors and sensors because it doesn't show the CMOS battery health on our NUCs.

Purpose:

• Demonstrate a simple lineinfile checker
• Check for any CMOS batteries that need to be replaced
• Demonstrate setting the hardware (RTC) clock from the system clock

From NUC 1, log in to the Ansible control node, NUC2.

Create file /home/ansible/my-project/cmos-check.yml

cmos-check.yml

---
- hosts: nodes
  become: true
  become_user: root
  tasks:
    - name: CMOS battery health
      lineinfile:
        path: /proc/driver/rtc
        line: "batt_status	: okay"
        state: present
      check_mode: true
      register: cmos_battery_ok
    - name: Set hardware clock
      command: hwclock -w

ansible-playbook -i hosts cmos-check.yml

Congratulations on getting this far! Next up is installing Folding at Home (FAH)