Nested grains use

[Karl Latiss]

I'm trying to understand how to use nested grains values. I'm using 0.14

On my minion I have the following defined:

# configure server roles

grains:

  roles:

    - infrastructure

    - databaseserver:

      - memoryprofile: 1GB

On my master I see:

$ salt 'hostname' grains.item roles

hostname:

  roles:

      infrastructure

      {'databaseserver': [{'memoryprofile': '1GB'}]}

If I ping based just on the infrastructure role then all is OK:

$ salt -G 'roles:infrastructure' test.ping

hostname:

    True

But I would like to address the host by it's memoryprofile value in this case. How do I do that? I've tried all sorts of variations from

$ salt -G 'roles:databaseserver' test.ping

No minions matched the target. No command was sent, no jid was assigned.

to

$ salt -G 'roles:databaseserver:memoryprofile:1GB' test.ping

No minions matched the target. No command was sent, no jid was assigned.

to the bizarre

$ salt -G 'roles:{'databaseserver': [{'memoryprofile': '1GB'}]}' test.ping

No minions matched the target. No command was sent, no jid was assigned.

There's a right way to do this I'm sure but I can't see to find it. Or the appropriate documentation.

If anyone has some insight it would be appreciated.

Karl.

[Karl Latiss]

No suggestions? Maybe everyone is doing this with pillars?

[Thomas S Hatch]

So this is because databaseserver is in a list, the matching just looks for a string in a list and does not dive down deeper, try grains like this:

grains:

  roles:

    - infrastructure

  database:

    memoryprofile: 1GB

Then match on the database:memoryprofile grain

Thomas S. Hatch  |  Founder, CTO

5272 South College Drive, Suite 301 | Murray, UT 84123

tha...@saltstack.com | www.saltstack.com

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[Karl Latiss]

OK, that works. To extend this to what I wanted to do originally I now have:

grains:

  roles:

    - infrastructure

    - databaseserver

  databaseserver:

    memoryprofile: 1GB

    maxpacketsize: 10M

Thanks for the push in the right direction!

Karl.

[Karl Latiss]

Hmm, spoke too soon. I'm close as

$ salt -G 'databaseserver:memoryprofile:1GB' test.ping

hostname:

    True

works, and

$ salt 'hostname' grains.item databaseserver

hostname:

  databaseserver: {'memoryprofile': '1GB'}

shows me what I expect. However when I try to test:

{% if 'memoryprofile:1GB' in grains['databaseserver'] %}

I get the below output which, unfortunately, I cannot decipher:

hostname:

    Data failed to compile:

----------

    Rendering SLS mysql failed, render error:

Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/salt/state.py", line 1779, in render_state

    fn_, self.state.rend, self.state.opts['renderer'], env, sls, rendered_sls=mods)

  File "/usr/lib/python2.6/site-packages/salt/template.py", line 61, in compile_template

    ret = render(input_data, env, sls, **render_kwargs)

  File "/usr/lib/python2.6/site-packages/salt/renderers/jinja.py", line 36, in render

    'Unknown render error in jinja renderer'))

SaltRenderError: Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/salt/utils/templates.py", line 55, in render_tmpl

    output = render_str(tmplstr, context, tmplpath)

  File "/usr/lib/python2.6/site-packages/salt/utils/templates.py", line 98, in render_jinja_tmpl

    output = jinja_env.from_string(tmplstr).render(**context)

  File "/usr/lib64/python2.6/site-packages/jinja2/environment.py", line 669, in render

    return self.environment.handle_exception(exc_info, True)

  File "<template>", line 30, in top-level template code

TypeError: argument of type 'StrictUndefined' is not iterable

Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/salt/utils/templates.py", line 55, in render_tmpl

    output = render_str(tmplstr, context, tmplpath)

  File "/usr/lib/python2.6/site-packages/salt/utils/templates.py", line 98, in render_jinja_tmpl

    output = jinja_env.from_string(tmplstr).render(**context)

  File "/usr/lib64/python2.6/site-packages/jinja2/environment.py", line 669, in render

    return self.environment.handle_exception(exc_info, True)

  File "<template>", line 30, in top-level template code

TypeError: argument of type 'StrictUndefined' is not iterable

[Kevin B]

I've found the only way to match nested grains like that in states is:

{% if grains.databaseserver.memoryprofile == '1GB' %}

[Karl Latiss]

That's it! Thank-you.

Makes me wonder if I'm doing it right though...

[Thomas S Hatch]

I would do:

{% if salt['grains.get']('databaseserver:memoryprofile') == '1GB' %}

since the get function is safe, it won't stack trace if something is not present, it just returns None

Thomas S. Hatch  |  Founder, CTO

5272 South College Drive, Suite 301 | Murray, UT 84123

tha...@saltstack.com | www.saltstack.com

[Kevin B]

Awesome, for some reason I couldn't get this to work previously with grains.get. Probably a syntax issue as it works now.