How to ensure that the dhcp pool name exist before updating options using ansible - networking

Question

Here is my playbook. When I execute it, the command ip dhcp pool {{ item.name }} don't check if the name exist or not. I use the parameter "match: exact" but it doesn't work. So can I use if statement in ansible playbook or is there a way to check the pool name before execute commands.
I use when in the playbook to check if item.name is defined but it also don't work.
---
- name: "UPDATE DHCP OPTIONS FOR FNAC-FRANCHISE SWITCHES"
hosts: all
gather_facts: false
vars:
xx: ["ip dhcp pool VOICEC_DHCP","ip dhcp pool DATA","ip dhcp pool VIDEO_DHCP ","ip dhcp pool WIFI_USER"," ip dhcp pool WIFI_ADM", ]
tasks:
- name: "CHECK"
ios_command:
commands:
- show run | include ip dhcp pool
register: output
- name: DISPLAY THE COMMAND OUTPUT
debug:
var: output.stdout_lines
- name: transform output
set_fact:
pools: "{{ item | regex_replace('ip dhcp pool ', '') }}"
loop: "{{ output.stdout_lines }}"
- name: "UPDATE DHCP OPTIONS IN POOL DATA & WIFI_USER"
ios_config:
lines:
- dns-server 10.0.0.1
- netbios-name-server 10.0.0.1
- netbios-node-type h-node
parents: ip dhcp pool {{ item.name }}
match: exact
loop: "{{ pools }}"
Here is the output that I have
ok: [ITG] => {"ansible_facts": {"discovered_interpreter_python": "/usr/bin/python"}, "changed": false, "stdout": ["ip dhcp pool VIDEO_DHCP\nip dhcp pool WIFI_ADM\nip dhcp pool VOICEC_DHCP\nip dhcp pool DATA\nip dhcp pool WIFI_USER"], "stdout_lines": [["ip dhcp pool VIDEO_DHCP", "ip dhcp pool WIFI_ADM", "ip dhcp pool VOICEC_DHCP", "ip dhcp pool DATA", "ip dhcp pool WIFI_USER"]]}
TASK [DISPLAY THE COMMAND OUTPUT] *********************************************************************************************************************************************
ok: [ITG] => {
"output.stdout_lines": [
[
"ip dhcp pool VIDEO_DHCP",
"ip dhcp pool WIFI_ADM",
"ip dhcp pool VOICEC_DHCP",
"ip dhcp pool DATA",
"ip dhcp pool WIFI_USER"
]
]
}
TASK [transform output] *******************************************************************************************************************************************************
ok: [ITG] => (item=[u'ip dhcp pool VIDEO_DHCP', u'ip dhcp pool WIFI_ADM', u'ip dhcp pool VOICEC_DHCP', u'ip dhcp pool DATA', u'ip dhcp pool WIFI_USER']) => {"ansible_facts": {"pools": ["VIDEO_DHCP", "WIFI_ADM", "VOICEC_DHCP", "DATA", "WIFI_USER"]}, "ansible_loop_var": "item", "changed": false, "item": ["ip dhcp pool VIDEO_DHCP", "ip dhcp pool WIFI_ADM", "ip dhcp pool VOICEC_DHCP", "ip dhcp pool DATA", "ip dhcp pool WIFI_USER"]}
There are switches which pool name WIFI_USER doesn't exist and I don't want to create it in the switch if the line "parents: ip dhcp pool {{ item.name }}" does not match.

Answer 1

if i simulate your return value:
- name: vartest
hosts: localhost
vars: #d use just to test
xx: ["ip dhcp pool VOICEC_DHCP","ip dhcp pool DATA","ip dhcp pool VIDEO_DHCP ","ip dhcp pool WIFI_USER"," ip dhcp pool WIFI_ADM", ]
tasks:
- name: trap output
ios_config:
parents: show ip dhcp pool
register: output
- name: transform output
set_fact:
pools: "{{ pools | default([]) + [item | regex_replace('ip dhcp pool ', '')] }}"
loop: "{{ output.stdout_lines[0] }}" #you adapt following the result output.stdout or something else
- name: "UPDATE DHCP OPTIONS IN POOL DATA & WIFI_USER"
ios_config:
commands:
- dns-server <ip-addr>
- netbios-name-server <ip-addr>
- netbios-node-type h-node
parents: ip dhcp pool {{ item }}
loop: "{{ pools }}"