CODEWITHSUNDEEP
jinja2ansible
user2363318
user2363318

Reputation: 1067

ansible Jinja2 template loop for hosts with a var defined

hosts

[mesosSandbox]
mesos1-01d.chalybs.net zoo_id=1
mesos1-02d.chalybs.net zoo_id=2
mesos1-03d.chalybs.net zoo_id=3
mesos1-04d.chalybs.net
mesos1-05d.chalybs.net

I have a template that generates the zookeeper zoo.cfg

{% for server in groups[cluster] %}
    server.{{loop.index}}={{server}}:2888:3888
{% endfor %}

Is there a way to add an if zoo_id is defined to this loop or can I generate a list via a task in the playbook?

Upvotes: 2

Views: 7587

Answers (2)

dex
dex

Reputation: 159

Ansible's if var is defined syntax is derived from jinja. You should be able to check for zoo id right in the loop:

{% for server in groups[cluster] %}
    {% if hostvars[server].zoo_id is defined %}
        server.{{loop.index}}={{server}}:2888:3888
    {% endif %}
{% endfor %}

I can't say whether this will compile/run without seeing more of your playbook, but assuming the loop in your question works as is, this will allow you to filter on whether zoo_id is defined.

Upvotes: 5

ElementalStorm
ElementalStorm

Reputation: 828

Ansible's template syntax is Jinja2, so you can use it right away.

Also, you need to access zoo_id for the target host using hostvars array.

{% for server in groups[cluster] %}
    {% if hostvars[server].zoo_id is defined %}
        server.{{loop.index}}={{server}}:2888:3888
    {% endif %}
{% endfor %}

You may need to load delegate facts before being able to access hostvars, but I believe it's not needed if you need to access anything defined directly in the inventory.

Upvotes: 2

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