Registers

Capture the output of the play inside the variable

- name: Register Playbook
  hosts: proxy
  tasks:
    - name: Run a command
      command: uptime
      register: server_uptime

    - name: Inspect the server_uptime variable
      debug:
        var: server_uptime

    - name: Show the server uptime
      debug:
        msg: "{{ server_uptime.stdout }}"

Ansible special variables

Docs

The two most important ones are

ansible playhostall
ansible playhost This is holds what nodes where successful

Filtering the nodes

Shorter one

{{ ansible_play_host_all | select('not in', ansible_play_hosts) | join(', ') }}

Longer one

{% for host in ansible_play_host_all %}

{% if host not in ansible_play_hosts%}

{{host}}

{% endif %}

{% endfor %}

Ansible variables

Varialbe prcencece

Docs

The most important is the --extra-vars

(for example, -e "user: my_user")(always win precedence)

Including external variables

Just use var files to import them from the another yml file Keep in mind that vars files loads the variables right at the start of the playbook**.

Dynamic Varaibles

You can also use the include vars module to dynamically load your variables in your playbook.

- name: Working with variables
  hosts: node1
  tasks:
    - name: Load the variables
      include_vars: myvars.yml

    - name: Show 2nd item in port_nums
      debug:
        msg: SSH port is {{ port_nums[1] }}

Creating a list dictionaries

The variables can be listed in the array
```
vars:
   port_nums: [21,22,23,25,80,443]
```