Create a new list from an existing list in Ansible

Question

This has got to be a simple question but I can't seem to find the answer anywhere.

I have the following list:

yum_repo_ip_addrs: ['172.16.130.4', '172.16.130.1']

I want to dynamically create a list called yum_baseurls where I copy in these values into the list along with the rest of the url. The list should ultimately look like this when run successfully:

yum_baseurls:
  - "http://172.16.130.4/repos/elrepo-8-x86_64"
  - "http://172.16.130.1/repos/elrepo-8-x86_64"

Instead, I'm finding that after the first iteration of my loop it's pasting in the variables literally.

Here's my playbook:

---

- name: Print the list of baseurl IP addresses.
  debug:
    msg: "{{ yum_repo_ip_addrs }}"

- name: Create the list of baseurls.
  set_fact:
    yum_baseurls: "{{ yum_baseurls + ['http://{{ item }}/repos/elrepo-{{ ansible_distribution_major_version }}-{{ ansible_userspace_architecture }}'] }}"
  with_items:
    - "{{ yum_repo_ip_addrs }}"

- name: print the list of baseurls.
  debug:
    msg: "{{ yum_baseurls }}"

And here's the output I get when I run it:

TASK [yum : Print the list of baseurl IP addresses.] ***************************************************************************************
ok: [ansibletarget3.jnk.sys] => {
    "msg": [
        "172.16.130.4", 
        "172.16.130.1"
    ]
}

TASK [yum : Create the list of baseurls.] **************************************************************************************************
ok: [ansibletarget3.jnk.sys] => (item=172.16.130.4)
ok: [ansibletarget3.jnk.sys] => (item=172.16.130.1)

TASK [yum : print the list of baseurls.] ***************************************************************************************************
ok: [ansibletarget3.jnk.sys] => {
    "msg": [
        "http://172.16.130.1/repos/elrepo-8-x86_64", 
        "http://{{ item }}/repos/elrepo-{{ ansible_distribution_major_version }}-{{ ansible_userspace_architecture }}"
    ]
}

Is there a better way to generate my list?

Does this answer your question? [How can I make Ansible interpret a variable inside a variable?](https://stackoverflow.com/questions/67408680/how-can-i-make-ansible-interpret-a-variable-inside-a-variable) — β.εηοιτ.βε, Feb 22 '22 at 19:38
In short: `yum_baseurls: "{{ yum_baseurls + ['http://' ~ item ~'/repos/elrepo-' ~ ansible_distribution_major_version ~ '-' ~ ansible_userspace_architecture] }}"` — β.εηοιτ.βε, Feb 22 '22 at 19:39
@β.εηοιτ.βε That worked perfectly! Would you mind posting your response as an answer so that I can mark it as such? Thanks! — dutsnekcirf, Feb 22 '22 at 19:59

Vladimir Botka · Accepted Answer · 2023-08-01T20:43:05.377

2

I'd remove it from the code and put it somewhere into the vars, e.g.

yum_repo_ip_addrs: [172.16.130.4, 172.16.130.1]
version: 8
architecture: x86_64
yum_baseurls:
  {% filter from_yaml %}
  {% for ip in yum_repo_ip_addrs %}
  - http://{{ ip }}/repos/elrepo-{{ version }}-{{ architecture }}
  {% endfor %}
  {% endfilter %}

edited Aug 01 '23 at 20:43

answered Feb 22 '22 at 19:47

Vladimir Botka

58,131
4
32
63

Create a new list from an existing list in Ansible

1 Answers1