From NUC 1, log in to the Ansible control node, NUC 2.

We are going to create and run an Ansible playbook to update the OS on the nodes.

In the previous step we discovered and added the IP address of all our nodes to the file on NUC 2: /home/ansible/my-project/hosts

Purpose:

• Demonstrate a very useful playbook
• Update all our nodes to the latest code

Steps:

1. Create file /home/ansible/my-project/update.yml

   • - hosts: nodes
       become: true
       become_user: root
       tasks:
         - name: Update apt repo and cache on all Debian/Ubuntu boxes
           apt: update_cache=yes force_apt_get=yes cache_valid_time=3600
     
         - name: Upgrade all packages on servers
           apt: upgrade=dist force_apt_get=yes
     
         - name: Check if a reboot is needed on all servers
           register: reboot_required_file
           stat: path=/var/run/reboot-required get_md5=no
     
         - name: Reboot the box if kernel updated
           reboot:
             msg: "Reboot initiated by Ansible for kernel updates"
             connect_timeout: 5
             reboot_timeout: 300
             pre_reboot_delay: 0
             post_reboot_delay: 30
             test_command: uptime
           when: reboot_required_file.stat.exists

2. Test the playbook
   • ansible-playbook -i hosts update.yml

Congratulations you just updated your nodes! Next check your CMOS Battery Health