DevOps Classroomnotes 31/May/2023

Ansible contd

Facts

• ansible collects information about the node on which it is executing by the help of module called as setup
• Ansible playbook by default collects information about nodes where it is executing, we can use this with the help of variables
• Collecting information can be disabled as well

---
- name: do something
  hosts: all
  gather_facts: no
  ...
  ...

• In the playbook the facts will be collected and will be available in a special variables ansible_facts
• Consider the below playbook

---
- name: exploring facts
  become: no
  hosts: all
  tasks:
    - name: print os details
      ansible.builtin.debug:
        msg: "family: {{ ansible_facts['os_family'] }} distribution: {{ ansible_facts['distribution'] }}"

• The statement ansible_facts['os_family'] represents accessing os family from the facts collected
• From facts the variables can be accessed with full names ansible_default_ipv4 or ansible_facts['default_ipv4']

---
- name: exploring facts
  become: no
  hosts: all
  tasks:
    - name: print os details
      ansible.builtin.debug:
        var: ansible_default_ipv4
    - name: same info
      ansible.builtin.debug:
        var: ansible_facts['default_ipv4']

• Lets apply conditionals to ansible playbook Refer Here
• Refer Here for the changeset and focus on combined.json

Explore

• Explore the verbosity levels of execution i.e -v, -vv , -vvv ..
• Write an ansible adhoc command to install git on node1

sudo apt install git
sudo yum install git

• Install metric beat on ubuntu Refer Here