variables in hostname doesn't work well with jinja2 templates

Archives Ansible Project
1

I’m using variables within the inventory host name to provision environments dynamically using the ansible openstack modules and this is working well

[openstack] myserver-{{env}}.subdomain.mycompany.com

but, when I try to use these hostnames in a jinja2 template snippet, it’s giving me errors

`

  • name: find list of openstack servers which
    set_fact:
    openstack_servers: “{% for host in groups[‘openstack’] %}{{ hostvars[host][‘inventory_hostname’]{% if not loop.last %},{% endif %}{% endfor %}”
    `

Is there a way to make it working? Any help or references in this regard will be appreciated :slight_smile:

To replicate this kind of error, run the below play (test.yml) with the below inventory file(inventory.txt)

test.yml

`

2

looks like ansible lazily loads the hostvars dict with the raw hostname and doesn’t apply variable substitution, but the for other dicts like groups variable substitutions are applied. Is this a bug?

The hostvars dict has myserver-{{env}}.subdomain.mycompany.__com as the key instead of myserver-dev1.subdomain.mycompany.com and ansible fails with the error The error was: ‘ansible.vars.hostvars.HostVars object’ has no attribute u’myserver-dev1.subdomain.mycompany.com

3

raised a GitHub issue for the same :slight_smile: - https://github.com/ansible/ansible/issues/16565