ansible syntax to use "if-else" and "set"

[Ansar Sahit]

Hi All,

Im trying to choose ansible inventory host group conditionally.

- name: Set group

  set_fact:

    group: |

        {% if c == 1 %}

        {% set group = 'grp1' %}

        {% elif c == 2 %}

        {% set group == 'grp3' %}

        {% else %}

        {% group == 'grp4' %}

        {% endif %}

- debug:

     var=group

This doesnt seem to work.

Whats the right way to use if-else with ansible set??

Kinldy assist.

[S C Rigler]

In your example of what you're trying to do, you're setting "group" inside of the template but never returning it to the task.  What you might want is something like this:

- name: Set Group

  set_fact:

    group: |

      {% if c == 1 %}

      grp1

      {% elif c ==2 %}

      grp3

      {% else %}

      grp4

      {% endif %}

-- Steve

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[Brian Coca]

vars:
group: ' {{ c ==1|ternary('gr1', c==2|ternary('grp3', 'grp4')) }}'

----------
Brian Coca

[Ansar Sahit]

Hi Brian,

how can I use this if no of groups I have is like 10 ?

[Kai Stian Olstad]

On 15.06.2019 19:14, Ansar Sahit wrote:
> how can I use this if no of groups I have is like 10 ?

Just extent it with parentheses inside parentheses, not recommended since it makes it more or less unreadable so just use the solution Steve Rigler gave you.


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Kai Stian Olstad

[Karl Auer]

Or maybe a series of set_fact: statements:

- set_fact

     group: 'BAD'

- set_fact:

     group: grp1

  when: c == 1

- set_fact:

     group: grp2

  when: c == 2

- set_fact:

     group: grp3

  when: c == 3

[...etc...]

- fail:

     msg: "Invalid value for 'c' or 'c' not set!"

  when: group == 'BAD'

Regards, K.

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[Ansar Sahit]

Hi All,

Thankyou for the response, I used Rigler's set_fact to determine the hostgroup like below

- name: Set Group

  set_fact:

    group: |

      {% if c == 1 %}

      grp1

      {% elif c ==2 %}

      grp3

      {% else %}

      grp4

      {% endif %}

- name: Run the playbook

  hosts: "{{ hostvars.localhost.group }}"

  roles:

    - myplaybook.yml

My inventory file is like below:

hosts.ini

[appdagents]

grp1

grp2

grp3

.

.

.

grp8

[grp1:vars]

var1="asfadfdsg"

[grp2:vars]

var1="gsfgfh"

.

.

.

[grp1]

host1/db1 ansible_host=host1 db=db1

host1/db2 ansible_host=host1 db=db2

.

.

.

etc

Im getting below error.

 [WARNING]: **Could not match supplied host pattern, ignoring: grp1**

I did look into few github issues and it says any commented lines in hosts.ini could cause a problem and I dont have any commented lines. 

Kindly help

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[Kai Stian Olstad]

On 16.06.2019 13:21, Ansar Sahit wrote:
> Hi All,
>
> Thankyou for the response, I used Rigler's set_fact to determine the
> hostgroup like below
>
> - name: Set Group
> set_fact:
> group: |
> {% if c == 1 %}
> grp1
> {% elif c ==2 %}
> grp3
> {% else %}
> grp4
> {% endif %}

My hunch is that this produce a new line at the end.
You can check with
- debug: var=group

So when using YAML multi line you need to control the newlines.
|- will remove the last newline and {%- will remove any newline produced
by the YAML multiple lines

- name: Set Group
set_fact:

group: |-

{% if c == 1 %}
grp1

{%- elif c ==2 %}
grp3
{%- else %}
grp4
{%- endif %}

> Im getting below error.
>
> [WARNING]: **Could not match supplied host pattern, ignoring: grp1**

It's probably a newline at the end.


--
Kai Stian Olstad

[Ansar Sahit]

HI Kai ,

I tried giving if in a single line and still get same error.

- name : set fact variable

  set_fact:

       group: "{% if c == 1 %}grp1{% elif c == 2 %}grp2{% else %}grp3{% endif %}"

Same error as mentioned above

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[Ansar Sahit]

I noticed 

Host "{{ hostvars.localhost.group}}" 

Isn't working.

What's the best way to choose host groups on which my playbook should run dynamically kindly help.

On Jun 17, 2019 8:20 AM, "Ansar Sahit" <sahit...@gmail.com> wrote:

HI Kai ,

I tried giving if in a single line and still get same error.

- name : set fact variable

  set_fact:

       group: "{% if c == 1 %}grp1{% elif c == 2 %}grp2{% else %}grp3{% endif %}"

Same error as mentioned above

[Ansar Sahit]

Hi Rigler ,

Another doubt,

I'm trying to use this "if else block" with "set" inside a variable jinja2 file used in roles templating.

Cat varfile.yml.j2

----

        {% if c == 1 %}

        {% set group = 'grp1' %}

        {% elif c == 2 %}

        {% set group == 'grp3' %}

        {% else %}

        {% group == 'grp4' %}

        {% endif %}

Groupname : {{ group }}

Var: "test" 

This groupname should get populated in the variable file.

How can I achieve this?

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[Kai Stian Olstad]

On 18.06.2019 20:18, Ansar Sahit wrote:
> Another doubt,
>
> I'm trying to use this "if else block" with "set" inside a variable jinja2
> file used in roles templating.
>
> Cat varfile.yml.j2
>
> ----
> {% if c == 1 %}
> {% set group = 'grp1' %}
> {% elif c == 2 %}
> {% set group == 'grp3' %}
> {% else %}
> {% group == 'grp4' %}
> {% endif %}
>
> Groupname : {{ group }}
> Var: "test"
>
> This groupname should get populated in the variable file.
>
> How can I achieve this?

You can't use set like this, that's why we have given you another way of doing this.

--
Kai Stian Olstad