Passing Blank Values in Hiera Hashes

[Danny Roberts]

I am trying to configure NGINX entirely within Hiera. For the most part this is very easy as the module directly supports setting things up in Hiera.

Where I am having an issue though is when creating an upstream in Hiera I am wanting to pass the 'ip_hash' parameter to it. The in source docs show an example of doing this from in a manifest but not Hiera. So I came up with this Hiera code for the upstream:

nginx::nginx_upstreams:
  'mycluster':
    ensure: 'present'
    members: [ '192.168.0.1:80', '192.168.0.2:80' ]
    upstream_cfg_prepend:
      ip_hash: ''

Though presumably because the value of that hash key/value pair is empty the ip_hash variable does not get added to the resulting config file on the server, you just get a blank line inserted. I've done some searching and cannot find a way to make this work in Hiera so it may simply not be possible, but does anyone know a way around this?

[Garrett Honeycutt]

On 2/5/15 11:24 AM, Danny Roberts wrote:
> I am trying to configure NGINX entirely within Hiera. For the most part
> this is very easy as the module directly supports setting things up in
> Hiera.
>
> Where I am having an issue though is when creating an upstream in Hiera
> I am wanting to pass the 'ip_hash' parameter to it. The in source docs

> <https://github.com/jfryman/puppet-nginx/blob/master/manifests/resource/upstream.pp#L28-L40> show

> an example of doing this from in a manifest but not Hiera. So I came up
> with this Hiera code for the upstream:
>
> |
> nginx::nginx_upstreams:
> 'mycluster':
> ensure:'present'
> members:['192.168.0.1:80','192.168.0.2:80']
> upstream_cfg_prepend:
> ip_hash:''
> |
>
>
> Though presumably because the value of that hash key/value pair is empty the ip_hash variable does not get added to the resulting config file on the server, you just get a blank line inserted. I've done some searching and cannot find a way to make this work in Hiera so it may simply not be possible, but does anyone know a way around this?
>

Hi,

It appears that ip_hash is being represented as a string instead of a
hash itself. If you are not going to give ip_hash any values, I don't
think you need to specify it at all.

HTH,
-g


--
Garrett Honeycutt
@learnpuppet
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Mobile: +1.206.414.8658

[Dan White]

Looks to me like the template upstream_header.erb is not built to handle this.
I know a template that can handle this sort of input --
Check out https://github.com/puppetlabs/puppetlabs-mysql/blob/master/templates/my.cnf.erb
line 9 specifically looks for true or '' in the value of a key/value pair and then just outputs the key.

The logic you need is in there, but it will take a bit of tinkering, I think.

“Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.”  (Bill Waterson: Calvin & Hobbes)

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