Ansible variable interpolation not working in brackets - variables

Question

I'm using Ansible to grab an VIP from InfoBlox and running into an issue when trying to build my exclude list. I need to exclude the first 3 IP's as they are reserved, however the CIDR range is a dynamic variable so I need to build this exclude list on the fly. Here's a representation of what I have so far:
---
- name: Assign VIP to FQDN in Grid Manager
hosts: all
connection: local
gather_facts: false
vars:
CIDR: 10.0.0.
tasks:
- set_fact:
EXCLUDES: "{{ EXCLUDES | default([]) + [item] }}"
with_sequence: start=1 end=3 format=''{{ CIDR }}%d''
- set_fact:
formated_excludes: "{{ EXCLUDES |join(', ') }}"
- debug:
msg: "{{ formated_excludes }}"
- set_fact:
VIP: "{{ lookup('nios_next_ip', '10.0.0.0/25', exclude=[formated_excludes]) | first }}"
- name: Print next IP address
debug:
msg: "The next available IP is {{ VIP }}"
Here are the results of the play:
PLAY [Assign VIP to FQDN in Grid Manager] *****************************************************************************************************************
TASK [set_fact] *******************************************************************************************************************************************
ok: [localhost] => (item='10.0.0.1')
ok: [localhost] => (item='10.0.0.2')
ok: [localhost] => (item='10.0.0.3')
TASK [set_fact] *******************************************************************************************************************************************
ok: [localhost]
TASK [debug] **********************************************************************************************************************************************
ok: [localhost] => {
"msg": "'10.0.0.1', '10.0.0.2', '10.0.0.3'"
}
TASK [set_fact] *******************************************************************************************************************************************
fatal: [localhost]: FAILED! => {"msg": "An unhandled exception occurred while running the lookup plugin 'nios_next_ip'. Error was a <class 'ansible.errors.AnsibleError'>, original message: Invalid value for exclude: \"'10.0.0.1', '10.0.0.2', '10.0.0.3'\": Invalid IPv4 address"}
PLAY RECAP ************************************************************************************************************************************************
localhost : ok=3 changed=0 unreachable=0 failed=1 skipped=0 rescued=0 ignored=0
The formatting appears to be fine, however the lookup won't accept it. For comparison, using the following works fine:
- set_fact:
VIP: "{{ lookup('nios_next_ip', '10.0.0.0/25', exclude=['10.0.0.1', '10.0.0.2', '10.0.0.3']) | first }}"
Here are the results:
PLAY [Assign VIP to FQDN in Grid Manager] *****************************************************************************************************************
TASK [set_fact] *******************************************************************************************************************************************
ok: [localhost]
TASK [Print next IP address] ******************************************************************************************************************************
ok: [localhost] => {
"msg": "The next available IP is 10.0.0.4"
}
PLAY RECAP ************************************************************************************************************************************************
localhost : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
Any thoughts on why this variable isn't working would be much appreciated!

Answer 1

Parameter exclude is "List of IP's ...", but the filter join makes a string from the list
- set_fact:
formated_excludes: "{{ EXCLUDES |join(', ') }}"
Use the list EXCLUDES in the parameter
- set_fact:
VIP: "{{ lookup('nios_next_ip', '10.0.0.0/25', exclude=EXCLUDES) | first }}"