Ansible use variable into other variable

Question

I'm configuring Ansible role to install a specific Nginx version. This is the folder structure:

nginx
├── defaults
│   └── main.yml
├── handlers
│   └── main.yml
├── molecule
│   └── default
│       ├── collections.yml
│       ├── converge.yml
│       ├── molecule.yml

│       └── verify.yml
├── tasks
│   └── main.yml
└── templates
    ├── nginx.j2
    └── nginx.repo

Now I have two problems:

How can define nginx_package variable using version variable?

---
defaults:
 user: nginx
 group: nginx
 version: 1.19.2
 #nginx_package: nginx-1.19.2-1.el7.ngx
 nginx_package: nginx-{{defaults.version}}-1.el7.ngx
 OS: centos
 OSRELEASE: 7

Can I (and how can) use a variable version into the file molecule\default\verify.yml

Thanks for the support.

For the first question, you can directly use version variable while declaring nginx_package variable as follows: nginx_package: nginx-{{version}}-1.el7.ngx — Unsel
– Unsel, Commented Sep 13, 2021 at 17:38
Having a top-level defaults: dict will make it difficult to work with individual key-pairs inside it. Better to keep each role default variable separate, i.e. nginx_user: nginx, nginx_group: nginx, etc, — seshadri_c
– seshadri_c, Commented Sep 14, 2021 at 5:52
Hi Unsel, thanks for the reply. I tried to use nginx_package: nginx-{{version}}-1.el7.ngx but I receive this error: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: {'version': '1.19.2', 'nginx_package': 'nginx-\"{{ version }}\"-1.el7.ngx', 'version' is undefined — Marco Ferrara
– Marco Ferrara, Commented Sep 15, 2021 at 14:55
Hi Seshadri_c, thanks for your comment. I can't change the defaults structure. — Marco Ferrara
– Marco Ferrara, Commented Sep 15, 2021 at 15:04
Then you'll have to define other variable outside the defaults dict. Values within the dict structure can not be cross-referenced. nginx_package: nginx-{{defaults.version}}-1.el7.ngx will work when you put it outside defaults:. — seshadri_c
– seshadri_c, Commented Sep 15, 2021 at 15:18

Muhammed Sherief · Accepted Answer · 2021-09-13 17:01:17Z

0

Use set_fact in main/task.yaml to set a variable using another variable. Doc: https://docs.ansible.com/ansible/latest/collections/ansible/builtin/set_fact_module.html

answered Sep 13, 2021 at 17:01

Muhammed Sherief

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