Ansible libvirt dynamic inventory

In this video I configure a dynamic inventory in Ansible for quem kvm guest using community.libvirt

https://docs.ansible.com/ansible/3/collections/community/libvirt/libvirt_qemu_connection.html

Some notes on this plugin are.

  • currently DOES NOT work with selinux set to enforcing in the VM.
  • Requires the qemu-agent installed in the VM.
  • Requires access to the qemu-ga commands guest-exec, guest-exec-status, guest-file-close, guest-file-open, guest-file-read, guest-file-write.

This works with remote host and linux containers but in the video I did this all local.

First I installed the collection.

ansible-galaxy collection install community.libvirt

Created a dynamic inventory

$ cat kvm.yml
# Connect to qemu
plugin: community.libvirt.libvirt
uri: 'qemu:///system'

Note the uri would change for lxc or remote connections.

After the inventory set up test it

ansible-inventory --inventory kvm.yml --list





You should see the info about your guest. If you get red or an error verify that the guest agent is running and that it has access to the guest-exec and guest-file commands.





A good way to test the guest agent is with a guest execute of ls





virsh qemu-agent-command “Name of your Guest VM” '{"execute": "guest-exec", "arguments": { "path": "/usr/bin/ls", "arg": [ "/" ], "capture-output": true }}'





If you have issues take a look at my previous video where I provisioned the guest https://thenathan.net/2022/09/29/virt-builder/.





Once your inventory is working you can connect with the console.





ansible-console --inventory kvm.yml -l “Name of your Guest VM”





I used -l to limit because I only had the one host running.





Now we are in the console and can run some commands to test





ls





cat /etc/redhat-release





whoami





exit





This is the very simple playbook I used to test playbooks running against the inventory. t





$ cat   dnf_update_reboot.yml 
---
- hosts: alma8
  gather_facts: false
  become: true
  any_errors_fatal: yes
  tasks:

  - name: DNF update the system
    dnf:
      name:  "*"
      state: latest

  - name: Install the latest version of yum-utils
    dnf:
      name: yum-utils
      state: latest

  - name: Reboot required
    command: "/usr/bin/needs-restarting -r"
    register: reboot_required
    ignore_errors: True
    changed_when: False
    failed_when: reboot_required.rc == 2

  - name: Rebooting
    reboot:
      post_reboot_delay: 60
    throttle: 1
    when: reboot_required.rc == 1 and ansible_facts ['virtualization_role'] != 'host'boot_required.rc == 1 and ansible_facts ['virtualization_role'] != 'host'


You can run the playbook with the ansible-playbook command 





ansible-playbook -i kvm.yml dnf_update_reboot.yml










ansible-console –inventory kvm.yml -l “Name of your Guest VM”