Looping through a group's IP numbers

[Michael Mahemoff]

I have a rule like this:

- name: Create user

  mysql_user: name=app

                     host=={{ item }}

                     ...

  with_items:

    - localhost

    - 127.0.0.1

    - "{{ groups['webservers'] }}"

    # - <here I want to list ip numbers of the webservers group>

How can I make the list include IP numbers of each webserver host. I know I can use ansible_eth0.ipv4.address to map from hostname to IP, but I don't know how to map a whole list to another list. And I can't see any way to define a variable as the result of a loop.

[Matt Martz]

I would split your create user into 2 tasks.  1 for localhost and the other for web servers:

- name: Create localhost mysql users

  mysql_user: name=app host="{{ item }}"

  with_items:

    - localhost

    - 127.0.0.1

- name: Create webservers mysql users

  mysql_user: name=app host="{{ hostvars[item]['ansible_eth0']['ipv4']['address'] }}"

  with_items: groups['webservers']

-- 
Matt Martz
ma...@sivel.net

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[Michael Mahemoff]

I see, thanks. I'd still be interested if there's any other way to do it, as it would be useful elsewhere too and prefer not to duplicate plays if possible.

[Matt Martz]

The other way to do it would be something like:

- name: Create mysql servers

  mysql_user: name=app host="{{ hostvars[item]['ansible_eth0']['ipv4']['address'] if hostvars[item]['ansible_eth0'] is defined else item }}"

  with_items:

    - localhost

    - 127.0.0.1

    - "{{ groups['webservers'] }}

The above example should work with 1.5, although I do believe that is over complicated, hard to read and not easily understand.  

You could expand that to a regular {% if ... %}{{ address }}{% else %}{{ item }}{% endif %} type line, but that gets even longer and harder to read in my opinion with all of the special characters that get mixed into that line.

-- 
Matt Martz
ma...@sivel.net

To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/be29a096-6e1a-47f9-8cbd-1129577719d8%40googlegroups.com.