If condition in ansible jinja2 template

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1

Search keyword in “host_fqdn” variable. If the value has “lab.com” keyword in it, it should directly store the value to “host_fqdn” again
or else it should add “lab.com” keyword to the value and store it to “host_fqdn” variable. Please assist.

vars:
host_fqdn: server
host_fqdn: |
{% if ‘lab.com’ in {{ host_fqdn }} %}
{% host_fqdn = “{{ host_fqdn }}” %}
{% else %}
{% host_fqdn = “{{ host_fqdn }}.lab.com” %}
{% endif %}

2

I'm pretty sure you can't use Jinja in vars like that, but you can have a set_fact task like this

   - set_fact:
       host_fqdn: "{{ host_fqdn if 'lab.com' in host_fqdn else host_fqdn ~ '.lab.com' }}"

3

Can you please confirm, if the below syntax is correct. I am getting error.

vars_prompt:

  • name: host_fqdn
    prompt: Enter Hostname of a new VM
    private: no
    tasks:
  • set_fact:
    host_fqdn: “{{ host_fqdn if ‘lab.com’ in host_fqdn else host_fqdn ‘.lab.com’ }}”
  • debug: var=host_fqdn
4

What is the error then? We are not psychic.

5

This was the error.

TASK [set_fact] ****************************************************************************************************************************************
fatal: [rchtest01]: FAILED! => {“msg”: “template error while templating string: expected token ‘end of print statement’, got ‘string’. String: {{ host_fqdn if ‘lab.com’ in host_fqdn else host_fqdn ‘.lab.com’ }}”}

6

You are missing the tilde ~ in you syntax, check my previous mail and you'll see the tilde.

7

Sorry my bad, it missed it. it’s working perfectly now, Thanks much !!

TASK [debug] *******************************************************************************************************************************************
ok: [rchtest01] => {
“host_fqdn”: “rchtest01.lab.com”
}

8

If possible could you please explain the syntax, It will be very helpful for me to use it in other cases.

9

I could try, not sure if it's understandable

Just split it in multiple lines

[1] {{ host_fqdn
[2] if 'lab.com' in host_fqdn
[3] else
[4] host_fqdn ~ '.lab.com' }}

[2]
If the variable host_fqdn contains the string lab.com the choose [1].

[3]
If the variable host_fqdn dosen't contains the string lab.com the choose [4]

[4]
Tilde is used to concatenate two strings.
So this will concatenate the content of variable fqdn_host with the string .lab.com

You can also use the Ansible ternary filter

{{ ('lab.com' in host_fqdn) | ternary(host_fqdn, host_fqdn ~ '.lab.com') }}

10

Thank you so much for the explanation.