for loop in jinja2

[David Fazeli]

Please explain to me how can I fix this problem? i have this file defaults/main.yml

---
node1:
 ip: 1.1.1.1

node2:
 ip: 2.2.2.2

node3:
 ip: 3.3.3.3 

Now, I want in template file ip.j2 by for loop access the IPs of each server and save in address variable

Like this:

address= 1.1.1.1,2.2.2.2,3.3.3.3




I tried this code:

address={% for x in {{nubmer_nodes}} %}
{{node[x].ip}}
{% if loop.last %},{% endif %}
{% endfor %}




But an error occurs. How should I do this?

Error :

TASK [Gathering Facts] *********************************************************************

ok: [db2]
ok: [db3]
ok: [db1]

TASK [ssh : -- my loop --] *************************************************************************

fatal: [db1]: FAILED! => {"changed": false, "msg": "AnsibleError: template error while templating string: expected token ':', got '}'. String: \r\naddress={% for x in {{number_nodes}} %}\r\n{{node[x].ip}}\r\n{% if loop.last %},{% endif %}\r\n{% endfor %}"}
fatal: [db2]: FAILED! => {"changed": false, "msg": "AnsibleError: template error while templating string: expected token ':', got '}'. String: \r\naddress={% for x in {{number_nodes}} %}\r\n{{node[x].ip}}\r\n{% if loop.last %},{% endif %}\r\n{% endfor %}"}
fatal: [db3]: FAILED! => {"changed": false, "msg": "AnsibleError: template error while templating string: expected token ':', got '}'. String: \r\naddress={% for x in {{number_nodes}} %}\r\n{{node[x].ip}}\r\n{% if loop.last %},{% endif %}\r\n{% endfor %}"}
        to retry, use: --limit @/etc/ansible/playbooks/get_ip_ssh.retry

PLAY RECAP ********************************************************

db1                        : ok=1    changed=0    unreachable=0    failed=1
db2                        : ok=1    changed=0    unreachable=0    failed=1
db3                        : ok=1    changed=0    unreachable=0    failed=1




[Kai Stian Olstad]

On Friday, 23 February 2018 13.28.32 CET David Fazeli wrote:
> Please explain to me how can I fix this problem? i have this file
> defaults/main.yml
>
> ---
> node1:
> ip: 1.1.1.1
>
> node2:
> ip: 2.2.2.2
>
> node3:
> ip: 3.3.3.3
>
>
> Now, I want in template file ip.j2 by for loop access the IPs of each
> server and save in address variable
>
> Like this:
>
> address= 1.1.1.1,2.2.2.2,3.3.3.3
>
>
> I tried this code:
>
> address={% for x in {{nubmer_nodes}} %}

You are already in template mode so you can't use {{ }}

address={% for x in nubmer_nodes %}

You have not shown your nubmer_nodes, but to make it work it need to be [1, 2, 3] for it to work.


> {{node[x].ip}}

This try to look up a likt named node, you need
{{ vars['node' ~ x }}

> {% if loop.last %},{% endif %}

This will only print , at the end, you are missing a not.
And to suppress the newline in the previous line you also need a - added

{%- if not loop.last %},{% endif %}


--
Kai Stian Olstad

[Nigel Metheringham]

Personally I would have done this like this (but you may have reasons for arranging it differently)...

defaults/main.yml:-

---
nodes:
    - name: node1
      ip: 1.1.1.1
    - name: node2
      ip: 2.2.2.2
    - name: node3
      ip: 3.3.3.3

Then the template something like

address={% for node in nodes %}
{{ node.ip}}
{% if not loop.last %},{% endif %}
{% endfor %}

All untested (sorry!)

    Nigel.

David Fazeli

23 February 2018 at 12:28

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[ Nigel Metheringham ------------------------------ ni...@dotdot.it ] 
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