Missing a split function in Jinja

[Patrick Ogenstad]

Hi,

I'm setting up a new test network and had some plans for how I wanted to setup DNS. However I ran into a brick wall since Jinja doesn't have a split function.

However I found that Ansible has it's own Jinja functions and I added a simple function to ansible/runner/filter_plugins/core.py:

def get_shard(a, separator, index):

    values = a.split(separator)

    index = int(index)

    return values[index]

(then added it under filters in the FilterModule class within that core.py file).

This solved my problem but I don't know if this is the right place for such code, or if the function has the best name. However I would like to see this in Ansible in the future. Would you accept a filter like this in core.py? If not could it be submitted somewhere else?

So what I wanted was to be able to create a vars file as below to be able to create DNS entries under a specific domain and automatically create the reverse DNS entry.

This is my vars file:

---

domain:

    int.ogenstad.com:

        hosts:

            ise-1:

                ip: 172.29.50.100

            nas-1:

                ip: 172.29.52.37

            ns2803-asw-01:

                ip: 172.29.50.3

            ns2803-ap-01:

                ip: 172.29.50.4

            srv-base-1:

                ip: 172.29.50.34

            srv-dev-1:

                ip: 172.29.50.39

            srv-esxi-1:

                ip: 172.29.50.10

            srv-file-1:

                ip: 172.29.50.37

            srv-master-1:

                ip: 172.29.50.42

            srv-mon-1:

                ip: 172.29.50.43

            srv-script-1:

                ip: 172.29.50.35

            tsrv-control-1:

                ip: 172.29.54.10

        aliases:

            www:

                host: srv-base-1

    int.networklore.com:

        hosts:

            tsrv-base-1:

                ip: 172.29.54.34

            tsrv-file-1:

                ip: 172.29.54.37

reverse_domain:

    50.29.172.in-addr.arpa:

    54.29.172.in-addr.arpa:

###

These are my tasks:

##

- name: Update forward zones

  template: src=forward.db.j2 dest="/etc/bind/zones/{{ item.key }}.db"

  with_dict: domain

- name: Update reverse zones

  template: src=reverse.db.j2 dest="/etc/bind/zones/rev.{{ item.key }}.db"

  with_dict: reverse_domain

##

# forward.db.j2 ##

{% for zone in domain %}

{% if zone == item.key  %}

{% for host in domain[zone]['hosts'] %}

{{ host }}       IN A {{ domain[zone]['hosts'][host]['ip'] }}

{% endfor %}

{% endif %}

{% endfor %}

###

# reverse.db.j2 ## Indented to have some kind of readability.

{% for zone in reverse_domain %}

 {% if zone == item.key  %}

  {% for forward in domain %}

   {% for host in domain[forward]['hosts'] %}

    {% if domain[forward]['hosts'][host]['ip']|get_shard('.', 0) ==     zone|get_shard('.', 2) %}

     {% if domain[forward]['hosts'][host]['ip']|get_shard('.', 1) ==      zone|get_shard('.', 1) %}

      {% if domain[forward]['hosts'][host]['ip']|get_shard('.', 2) ==       zone|get_shard('.', 0) %}

      {{ domain[forward]['hosts'][host]['ip']|get_shard('.', 3) }} IN PTR    {{    host}}.{{ forward }}.

      {% endif %}

     {% endif %}

    {% endif %}

   {% endfor %}

  {% endfor %}

 {% endif %}

{% endfor %}

###

An entry in the reverse zone would then look like this:

34 IN PTR    srv-base-1.int.ogenstad.com.

Basically it splits the ip address and the reverse domain name and then compares the parts to see if a particular host should be included in the reverse zone.

Best regards

Patrick

[Matt Martz]

Because jinja2 variables are Python objects, they also carry the methods of the Python object.  As such you can use .split() directly in a playbook/template such as:

domain[forward]['hosts'][host]['ip'].split('.')[0]

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Matt Martz
@sivel
sivel.net

[Patrick Ogenstad]

Ah, cool. Thanks Matt! I'll use that instead.

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