Jinja2 Filters

Jinja2 filters are functions that can be applied to content in a Jinja2 template. Filters can be chained together, just like functions in normal coding languages like python.

Loop

The loop function can be used to loop over a list of items.

{% for host in groups['web'] %}
Server Hostname: {{ hostvars[host]['inventory_hostname'] }}
Server IP: {{ hostvars[host]['ansible_host'] }}
{% endfor %}

If else statement

Only add certain content to the template, if a condition is met.

zone "mydomain.com" {

{% if inventory_hostname in groups['dns'][0] %}
type master;

{% else %}
type slave;

{% endif %}

};

Reference

Jinja offers a lot of templating functions. You can find more information in their documentation: Jinja 2 docs