CODEWITHSUNDEEP
ansiblejinja2nested-lists
programpee
programpee

Reputation: 13

Nested Variables in Jinja2/Ansible

I am struggling to understand how to use nested variables in Jinja2/Ansible

I have the following Variables in a yaml file

dual_homed_workloads:
  switch1:
    - tag: 200
      description: DB-Servers
      ports:
      lags: [1,2,4]
    - tag: 201
      description: Storage
      ports:
      lags: [1,2,4]
    - tag: 202
      description: iLo
      ports:
      lags: [1,3,4]
  switch2:
    - tag: 200
      description: DB-Servers
      ports:
      lags: [3,4]
    - tag: 211
      description: voice
      ports:
      lags: [1,]
    - tag: 2000
      description: egree
      ports:
      lags: [2,3]

and I want to search for the switch name matching the inventory_hostname, then get the tag of the VLAN

{% for vlan, switch in dual_homed_workloads %}
{% if switch == inventory_hostname %}
VLAN {{ vlan.tag }}
  name {{ vlan.descrption }}
{% endif %}
{% endfor %}

If I was to run this for switch 1 I'd want an output as follows

vlan 200
 name DB-Servers
vlan 201
 name Storage
vlan 202
 name iLo

Also the LAGs is a list, is there a way of searching that list for a value e.g. "1"

Thanks

Upvotes: 0

Views: 647

Answers (1)

Zeitounator
Zeitounator

Reputation: 44615

The following will loop other all vlans for the switch key equal to current inventory_hostname filtering out all vlans which do no contain 1 in the lags list:

{% for vlan in dual_homed_workloads[inventory_hostname] if 1 in vlan.lags %}
VLAN {{ vlan.tag }}
  name {{ vlan.description }}
{% endfor %}

Here are 2 variations since I don't know exactly what you intend to look for inside the lags key.

Keep vlans which are in either lags 1 or 2:

{% for vlan in dual_homed_workloads[inventory_hostname] if vlan.lags | intersect([1,2]) | length > 0 %}
VLAN {{ vlan.tag }}
  name {{ vlan.description }}
{% endfor %}

Only keep vlans which are lags 1 and 2:

{% set keep_lags = [1,2] %}
{% for vlan in dual_homed_workloads[inventory_hostname] if vlan.lags | intersect(keep_lags) | length == keep_lags | length %}
VLAN {{ vlan.tag }}
  name {{ vlan.description }}
{% endfor %}

Upvotes: 1

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