Using variables in the Jinja2 template in ansible Playbook

Question

Any idea of how we can use dynamic variables inside the Jinja2 Template. Below is the data from my Jinja2 template.

oracle.install.asm.diskGroup.disks=/dev/oracleasm/disks/DATA,/dev/oracleasm/disks/ARCH,/dev/oracleasm/disks/OCR

The variable values in the defaults/main.yml is:

     asm_disk_detail:
     - { name: 'OCR', path: '/dev/sde1' }
     - { name: 'DATA', path: '/dev/sdf1' }
     - { name: 'ARCH', path: '/dev/sdg1' }

I am trying to use these variable values to pass dynamically at the time of running the playbook. These values should automatically get populated in the template.

Solution 1

Yes, this is possible. The main.yml will be sourced automatically when the ansible role is invoked. You just have to write a jinja2 template file for the same.

For example the below file:

A better representation of the main.yml file would be

---
asm_disk_detail:
- name: OCR
  path: "/dev/sde1"
- name: DATA
  path: "/dev/sdf1"
- name: ARCH
  path: "/dev/sdg1"

jinja2 template: supports for loop so you can apply with_items on the above variable asm_disk_detail and create a config file as needed.

Note:- Please try the jinja2 file creation from your side in case any issues please shout :)

===============Play and jinja2 template

playbook-->

---
- name: test
  hosts: localhost
  tasks:
    - name: test
      include_vars: vars.yml
    - name: jinja2
      template:
        src: template/template.yml
        dest: target/target.yml

jinja2-->

{%- for item in asm_disk_detail -%}
{%- if not loop.last -%}
{{ item.path }}/{{ item.name }},
{%- else -%}
{{ item.path }}/{{ item.name }}
{%- endif -%}
{%- endfor -%}

output-->

oracle.install.asm.diskGroup.disks=/dev/sde1/OCR,/dev/sdf1/DATA,/dev/sdg1/ARCH

Solution 2

Use Ansible template module with a For loop in your template.

{% for disk in asm_disk_detail %}
  disk name: {{ disk.name}}
  disk path: {{ disk.path }}
{% endfor %}

Comments

[IOT]

Thanks for the reply..! My Template has the following line..! oracle.install.asm.diskGroup.disks=/dev/oracleasm/disks/{{ item }},/dev/oracleasm/disks/{{ item }},/dev/oracleasm/disks/{{ item }}. My vars file containes the below lines. asm_disk_detail: - { name: 'OCR', path: '/dev/sde1' } - { name: 'DATA', path: '/dev/sdf1' } - { name: 'ARCH', path: '/dev/sdg1' } The line in the template has to fetch the value from vars file, which is not working for me. I tried using For loop as well. @error404

[IOT]

Here it,s taking the same name for the 3 variables. @sebthebert

[error404]

@IOT Added the play, jinja2 template and the output format I am generating. Let me know in case you are looking for another output format