Accessing Variables within Inventory Vars using Jinja2

[Adam Keech]

I have been having a really tough time trying to use variables that are defined within an Inventory file.

For Example:

Inventory File:

[WebApp_Login]

server1

server2

server3

[WebApp_Login:vars]

route=login

[WebApp_Sweetness]

server2

[WebApp_Sweetness:vars]

route=sweetness

[WebApp_ReallyAwesomeSweetness]

server3

[WebApp_ReallyAwesomeSweetness:vars]

route=reallyawesomesweetness

J2 Template:

<Services description="XML Representation of AD Deployment Groups">

{% for service_name in groups|sort %}

  <Service id="{{ service_name }}" route=" THIS IS WHAT I NEED TO FILL IN WITH ROUTE VARIABLE ">

{% for host in groups[service_name]|sort %}

    <Machine>{{ host }}</Machine>

{% endfor %}

  </Service>

{% endfor %}

</Services>

I need to fill in the part that is bolded in the J2 Template.  Any help would be greatly appreciated.  I feel like there should be something called "groupvars" to be able to access, but there doesn't appear to be.

Thank You!

[Matt Martz]

groupvars are applied directly to the hosts that reside within that group.

So you should just be able to use {{route}} as long as the server resides within a group that contains the "route" variable.

-- 
Matt Martz
ma...@sivel.net

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[Brian Coca]

the problem is that group_vars are not 'by group' when you access them, they are collapsed into host. This should give you what you want.

route={{hostvars[groups[service_name][0]].route}} 

^ might need to ensure all {} and [] match

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Brian Coca
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[Brian Coca]

I should explain what the monster in my previous answer does:

hostvars[ <hostname> ].<varname> <= gives you access to the variable (varname) for a  'non current host' (hostname), otherwise you could just use <varname>.

groups[service_name][0] <== this retrieves the first hostname from the current groupname in the service_name variable.

compose both and your template 'should' work
​

[Adam Keech]

Thanks a lot for the explanation.  I will give it a try!

[Adam Keech]

I changed my template to:

<Services description="XML Representation of AD Deployment Groups">

{% for service_name in groups|sort %}

{% if service_name not in ['all', 'ungrouped'] %}

{% if hostvars[groups[service_name][0]].route  %}

  <Service id="{{ service_name }}" route="{{ hostvars[groups[service_name][0]].route }}">

{% else %}

  <Service id="{{ service_name }}">

{% endif %}

{% for host in groups[service_name]|sort %}

    <Machine>{{ host }}</Machine>

{% endfor %}

  </Service>

{% endif %}

{% endfor %}

</Services>

The idea is to have a route next to id in the xml it's generating if it has a route, otherwise, do not add a route to the xml.

I get an odd error back stating:

[localhost] => {'msg': 'host not found: ', 'failed': True}

Keep in mind, my hosts I am running this against is localhost.  The idea behind this playbook is to just generate an xml file via the services inventory file.

[Adam Keech]

Adding [0] after the groups[service_name] command is what is causing it to blow up.

[Adam Keech]

I figured out what was wrong.  Some of my groups did not have servers.

It now runs, but everything in the generated xml has the same route.  I will continue working on this, but the help so far was huge.  Much further than I was before.

[Brian Coca]

removing the [0] should return a list, not a single host, see if this is a bit cleaner

{% for service_name in groups|sort|difference(['all', 'ungrouped']) %}

{% set first_host = groups[service_name][0] %}

{% if 'route' in  hostvars[first_host] %}

 <Service id="{{ service_name }}" route="{{ hostvars[first_host].route }}">

​

this also assumes that the first host in the group has the correct route var (it can be overridden by individual hosts)

[Adam Keech]

Understood.  The issue is all of the groups have the same host.  What seems to be happening is the last route I assign to that host is what is used for all three.  I will have to make the routevariables unique for each and call them all separately.  Maybe something like this:

Inventory:

[WebApp_Login:vars]

WebApp_Login_route=login

[WebApp_number2]

KSQ-B-WEB-D01

[WebApp_number2:vars]

WebApp_number2_route=exposureindexbuilder

[WebApp_number3]

KSQ-B-WEB-D01

[WebApp_number3:vars]

WebApp_number3_route=marketdataadministration

{% for service_name in groups|sort|difference(['all', 'ungrouped']) %}

{% set first_host = groups[service_name][0] %}

{% if 'service_name_route' in  hostvars[first_host] %}

 <Service id="{{ service_name }}" route="{{ hostvars[first_host].service_name_route }}">

This is what I am working on now.  Thanks again for all of your help.

I realize I am doing something out of the ordinary here.  (Not using this inventory file as a typical inventory file.)

[Adam Keech]

This is what I came up with and it's now working great!  Thanks a lot for the help!

{% set route = service_name + "_route" %}

{% if hostvars[groups[service_name][0]][route]  %}

  <Service id="{{ service_name }}" route="{{ hostvars[groups[service_name][0]][route] }}">

[Michael DeHaan]

Good deal!

FYI -- It looks like for each group of hosts in the list "groups" the OP wants to do print some things.   If so, this first outer loop should just be

{% for service_name in group_names|sort %}

Versus "groups" above.   Else service_name isn't a string, it's a list of hosts if you had "groups" instead.

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