How to create dynamic list in yaml?

Question

I am trying to render a template. I have to create a list as

host:
- '111.222.333.444'
- '555.666.777.888'

which has to be taken from another host file.

I am using something like this:

{% for host in groups['hostgroup'] %}
host: {{ host }}
{% endfor %}

What is the correct way to achieve the result?

**See also:** https://stackoverflow.com/questions/41620674/use-placeholders-in-yaml — dreftymac, Oct 11 '18 at 22:59

score 3 · Accepted Answer · edited May 23 '17 at 11:58

3

Assuming you wish to declare a variable in your inventory called host which contains a list of ip addresses, you can try:

host: {{ groups['hostgroup'] }}

Or you could skip declaring this variable and use {{ groups['hostgroup'] }} directly wherever you plan to use {{ host }}

Look at add-quotes-join thread and this filter plugin if you want quotes.

EDIT: Assuming you are rendering a template, using the ansible template module

host:
{% for host in groups['hostgroup'] %}
 - '{{ host }}'
{% endfor %}

edited May 23 '17 at 11:58

Community

answered Apr 17 '15 at 16:38

Zasz

2

This gets me to `host: ['111.222.333.444', '555.666.777.888']` I want it in the format shown in the question. – proutray Apr 17 '15 at 16:55
1

Are you trying to initialize the `host` variable or are you rendering a template? – Zasz Apr 17 '15 at 17:02
Rendering a template. – proutray Apr 17 '15 at 17:02
Edited my answer, but it seems too simple I guess your intent is different. – Zasz Apr 17 '15 at 17:04
Silly of me to have _host:_ inside the for loop. – proutray Apr 17 '15 at 17:12

1 Answers1