CODEWITHSUNDEEP
ansiblejinja2
A K
A K

Reputation: 764

Ansible: how to compact jinja2 template using conditions

I am using ansible 2.1. Most webserver's has one IP only, but some server's has two IPs. Each webserver has special website for internal usage, i have special variable to define which IP is used for this site: if INTERNALWEBSITE_LISTEN_IP is null - used main IP, if not - custom IP from host_vars.

content of roles/web_std/defaults/main.yml:

r_web_std:
  INTERNALWEBSITE_LISTEN_IP: null

content on inventory/host_vars/100.200.1.2:

r_web_std:
  INTERNALWEBSITE_LISTEN_IP: "100.200.1.4"

(this host has two IP: 100.200.1.2 and 100.200.1.4, and 100.200.1.2 is default IP)

and here is fragment from server.conf.j2:

DocumentRoot /www/{% if r_web_std.INTERNALWEBSITE_LISTEN_IP == null %}{{ ansible_default_ipv4.address }}{% else %}{{ r_web_std.INTERNALWEBSITE_LISTEN_IP }}{% endif %}/www
ErrorLog /var/log/httpd/{% if r_web_std.INTERNALWEBSITE_LISTEN_IP == null %}{{ ansible_default_ipv4.address }}{% else %}{{ r_web_std.INTERNALWEBSITE_LISTEN_IP }}{% endif %}/error.log
CustomLog "/var/log/httpd/{% if r_web_std.INTERNALWEBSITE_LISTEN_IP == null %}{{ ansible_default_ipv4.address }}{% else %}{{ r_web_std.INTERNALWEBSITE_LISTEN_IP }}{% endif %}/access.log" combined

My eyes!

Is it possible to simplify this?

{% if r_web_std.INTERNALWEBSITE_LISTEN_IP == null %}
{{ ansible_default_ipv4.address }}
{% else %}
{{ r_web_std.INTERNALWEBSITE_LISTEN_IP }}
{% endif %}

Upvotes: 1

Views: 349

Answers (2)

udondan
udondan

Reputation: 60029

I like @Kyles approach. But for completeness, you can also use the default filter:

{{ r_web_std.INTERNALWEBSITE_LISTEN_IP | default(ansible_default_ipv4.address) }}

Upvotes: 2

Kyle
Kyle

Reputation: 4455

Try changing roles/web_std/defaults/main.yml to use

r_web_std: INTERNALWEBSITE_LISTEN_IP: "{{ ansible_default_ipv4.address }}" and just use INTERNALWEBSITE_LISTEN_IP everywhere that needs it?

Upvotes: 2

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