Newbie question about fetching specific value of a key from hash

[Sam]

My hiera entries -

mysqlconfig::custom_mysql_options:

  mysqld:

    replicate-ignore-db: 'test'

    server-id: 12

    datadir: '/data/mysql_data'

I want to get the value of datadir in my puppet module. Please let me know what is the syntax I need to use to fetch this value. I tried something as follows but it doesn't work. 

$datadir = hiera('mysqlconfig::custom_mysql_options[datadir]')

  file { "$datadir":

    ensure => directory,

    owner  => 'mysql',

    group  => 'mysql',

    mode   => '0755',

  }

Thanks in advance

Sam

[Martin Alfke]

Hi Sam

On 03 Feb 2016, at 16:28, Sam <kaila...@gmail.com> wrote:

> My hiera entries -
>
> mysqlconfig::custom_mysql_options:
> mysqld:
> replicate-ignore-db: 'test'
> server-id: 12
> datadir: '/data/mysql_data'
>
>
> I want to get the value of datadir in my puppet module. Please let me know what is the syntax I need to use to fetch this value. I tried something as follows but it doesn't work.
>
>
> $datadir = hiera('mysqlconfig::custom_mysql_options[datadir]’)

With hiera you can only specify keys, not elements of a hash.

you should change this to:

$custom_mysql_options = hiera(‘mysqlconfig::custom_mysql_options’)

You can now set a new variable reading the hash element:

$datadir = $custom_mysql_options[‘datadir’]

>
> file { "$datadir":
> ensure => directory,
> owner => 'mysql',
> group => 'mysql',
> mode => '0755',
> }
>
>

hth,
Martin

> Thanks in advance
> Sam
>
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[Craig Dunn]

>> I want to get the value of datadir in my puppet module. Please let me know what is the syntax I need to use to fetch this value. I tried something as follows but it doesn't work.
>>
>>
>> $datadir = hiera('mysqlconfig::custom_mysql_options[datadir]’)
>
> With hiera you can only specify keys, not elements of a hash.

That's not the case with Hiera 2.0+ which supports drilling down into
hashes and arrays... so you should also be able to do....

$datadir = hiera('mysqlconfig::custom_mysql_options.datadir')

If you're still on Hiera 1.0 though, what Martin said.