CODEWITHSUNDEEP
ansible
J. Doe
J. Doe

Reputation: 1529

Using Jinja filter with two variables in Ansible

I am trying to get a random host in a group that contains a list of IP's. We are running into some issues as our group name uses a variable, but the line is already in {{'s due to the Jinja random call.

- hosts: "{{ {{ env }}_as_group | random }}"

ERROR! template error while templating string: expected token 'end of print statement', got '{'. String: {{ {{ env }}_as_group | random }}

The env variable is passed into the playbook on execution with ansible-playbook "-e env=stage" myplaybook.yml

Looking around online, most people solve this with vars[env], however that doesnt seem to quite work for us -

- hosts: "{{ vars[env]_as_group | random }}"

ERROR! template error while templating string: expected token 'end of print statement', got '_as_group'. String: {{ tag_aws_autoscaling_groupName_[ env ]_as_group | random }}

If I make it - hosts: "{{ stage_as_group | random }}", it works as expected.

How can I set the host to pull a random value in the group {{ env }}_as_group?

Upvotes: 1

Views: 953

Answers (1)

β.εηοιτ.βε
β.εηοιτ.βε

Reputation: 39089

In Ansible, moustache should not be stacked.

So you should use the proper Jinja concatenation operator: ~.
Ending with:

- hosts: "{{ vars[env ~ '_as_group'] | random }}"

This said it is not totally clear to me what stage_as_group really is: is it a list or a hosts group?
If this is a group in you inventory, this won't work because random works on a sequence, and a host group is a string, not a sequence.

For that use case, you probably want this instead:

- hosts: "{{ groups[env ~ '_as_group'] | random }}"

Upvotes: 3

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