Puppet users - Apr 2011 - Suggestions for using tags and variable for an Array

Hi All,


I am writing some puppet manifests to manage some deployments.  I have
created a define which takes some parameters and i am providing the
input with variables in the site.pp file.    I am managing 3 different
environments like testing, staging and production and have tagged the
servers as tst_env, stg_env and prd_env for doing some customization.
However i have some common stuff to do in tst_env and stg_env
evironments, but i have to create 3 different if conditions, something
like this

if tagged(tst_env)
{
do somethng...
}

if tagged(stg_env)
{
do somethng...
}

if tagged(prd_env)
{
do somethng...
}

I would like to combine the tst_env and stg_env by using somethng like
a OR condition. Howerver the following below doesnt work.

 if tagged(tst_env|stg_env)

Any ideas how do i  apply the same code to 2 environments without
creating an additional if statement.

- I have 2nd query with arrays and variables

I am invoking a define by providing an array with some software
packages to be installed.

Eg:

     definename::install{
     [ ''''package1'''',
       ''''package2'''',
       ''''package3''''
      ]:
      othervariabes ...
    }

Within the define i am using the $name to parse the array and do the
stuff.

Is there a possibility that i can  assign that array to a variable
before the define and use it later. It works with normal variables,
However the following below doesnt work:

Eg:

$pkglist =  [ ''''package1'''',
       ''''package2'''',
       ''''package3''''
      ]:

     definename::install{
      $pkglist
      othervariabes ...
    }


- Can i also use if conditions while invoking defines?

Any inputs appreciated.

Regards,
Kevin

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On Mon, Apr 25, 2011 at 10:05 AM, linuxbsdfreak <linuxbsdfreak@gmail.com>
wrote:
> Hi All,
>
>
> I am writing some puppet manifests to manage some deployments.  I have
> created a define which takes some parameters and i am providing the
> input with variables in the site.pp file.    I am managing 3 different
> environments like testing, staging and production and have tagged the
> servers as tst_env, stg_env and prd_env for doing some customization.
> However i have some common stuff to do in tst_env and stg_env
> evironments, but i have to create 3 different if conditions, something
> like this
>
> if tagged(tst_env)
> {
> do somethng...
> }
>
> if tagged(stg_env)
> {
> do somethng...
> }
>
> if tagged(prd_env)
> {
> do somethng...
> }
>
> I would like to combine the tst_env and stg_env by using somethng like
> a OR condition. Howerver the following below doesnt work.
>
>  if tagged(tst_env|stg_env)
>
> Any ideas how do i  apply the same code to 2 environments without
> creating an additional if statement.
tagged doesn''t support regular expression, it appears to support an
array but it''s requiring all tags in the array to exist. You should be
able to do this instead:
if tagged(''test_env'') or tagged(''stg_env'')
> - I have 2nd query with arrays and variables
>
> I am invoking a define by providing an array with some software
> packages to be installed.
>
> Eg:
>
>     definename::install{
>     [ ''''package1'''',
>       ''''package2'''',
>       ''''package3''''
>      ]:
>      othervariabes ...
>    }
>
> Within the define i am using the $name to parse the array and do the
> stuff.
>
> Is there a possibility that i can  assign that array to a variable
> before the define and use it later. It works with normal variables,
> However the following below doesnt work:
>
> Eg:
>
> $pkglist =  [ ''''package1'''',
>       ''''package2'''',
>       ''''package3''''
>      ]:
>
>     define name::install{
>      $pkglist
>      othervariabes ...
>    }
Try using the fully qualified namespace to access the variable
(something like path to staging directory), so

class a::param {
  $pkglist = ...
}

define ... {
  notice($a::param::pkglist)
}

or pass it as a parameter if it changes per resource declaration.
> - Can i also use if conditions while invoking defines?
Yes, the only thing that confuses new user, is you can''t use if &
case
statements in a resource declaration.

type { ''title'':
  # can''t have if or case statement within resource.
  # only selector
  attribute => $var ? {
     ...
  }
}

if ... {
  # declare resources.
  type { "title":
    ...
  }
}

Thanks,

Nan

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Hi,

Thanks for your reply. The problem with the tagging is solved. However
i am confused with the 2nd part. I actually want to do somethng like
this to delete files:

I am creating a class called config_variables in which i want to have
an array of dirs of files to delete:

class config_variables {

$oldfilestoremove  = [ "file1", "file2" ]
$path_to_data = "/tmp"
$path_to_data2 = "/opt"

}

Then i want to declare another class according to different
environments. However i would like to do some sort of if condition
with the path variable and change it according to different
environments using the tags. The purge-data is a general define i have
and has a delete function which uses the $name variable and the path
variable defined below as parameters:

class purge_old_data inherits config_variables {

        purge-data::delete{
        $oldfilestoremove
        if tagged(tst_env) or if tagged(stg_env)
        {
        path => "$path_to_data",
        }
        if tagged(prd_env)
        {
        path => "$path_to_data2",
        }

        }
}

The above code doesnt work. I want to declare stuff in
config_variables section both arrays and variables and then call it
later.

Any help regarding this is appreciated.

Regards,
Kevin

On Apr 25, 8:21 pm, Nan Liu <n...@puppetlabs.com>
wrote:
> On Mon, Apr 25, 2011 at 10:05 AM, linuxbsdfreak
<linuxbsdfr...@gmail.com> wrote:
> > Hi All,
>
> > I am writing some puppet manifests to manage some deployments.  I have
> > created a define which takes some parameters and i am providing the
> > input with variables in the site.pp file.    I am managing 3 different
> > environments like testing, staging and production and have tagged the
> > servers as tst_env, stg_env and prd_env for doing some customization.
> > However i have some common stuff to do in tst_env and stg_env
> > evironments, but i have to create 3 different if conditions, something
> > like this
>
> > if tagged(tst_env)
> > {
> > do somethng...
> > }
>
> > if tagged(stg_env)
> > {
> > do somethng...
> > }
>
> > if tagged(prd_env)
> > {
> > do somethng...
> > }
>
> > I would like to combine the tst_env and stg_env by using somethng like
> > a OR condition. Howerver the following below doesnt work.
>
> >  if tagged(tst_env|stg_env)
>
> > Any ideas how do i  apply the same code to 2 environments without
> > creating an additional if statement.
>
> tagged doesn''t support regular expression, it appears to support
an
> array but it''s requiring all tags in the array to exist. You
should be
> able to do this instead:
> if tagged(''test_env'') or
tagged(''stg_env'')
>
>
>
>
>
>
>
>
>
> > - I have 2nd query with arrays and variables
>
> > I am invoking a define by providing an array with some software
> > packages to be installed.
>
> > Eg:
>
> >     definename::install{
> >     [ ''''package1'''',
> >       ''''package2'''',
> >       ''''package3''''
> >      ]:
> >      othervariabes ...
> >    }
>
> > Within the define i am using the $name to parse the array and do the
> > stuff.
>
> > Is there a possibility that i can  assign that array to a variable
> > before the define and use it later. It works with normal variables,
> > However the following below doesnt work:
>
> > Eg:
>
> > $pkglist =  [ ''''package1'''',
> >       ''''package2'''',
> >       ''''package3''''
> >      ]:
>
> >     define name::install{
> >      $pkglist
> >      othervariabes ...
> >    }
>
> Try using the fully qualified namespace to access the variable
> (something like path to staging directory), so
>
> class a::param {
>   $pkglist = ...
>
> }
>
> define ... {
>   notice($a::param::pkglist)
>
> }
>
> or pass it as a parameter if it changes per resource declaration.
>
> > - Can i also use if conditions while invoking defines?
>
> Yes, the only thing that confuses new user, is you can''t use if
& case
> statements in a resource declaration.
>
> type { ''title'':
>   # can''t have if or case statement within resource.
>   # only selector
>   attribute => $var ? {
>      ...
>   }
>
> }
>
> if ... {
>   # declare resources.
>   type { "title":
>     ...
>   }
>
> }
>
> Thanks,
>
> Nan
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On Wed, Apr 27, 2011 at 8:17 AM, linuxbsdfreak <linuxbsdfreak@gmail.com>
wrote:
> Hi,
>
> Thanks for your reply. The problem with the tagging is solved. However
> i am confused with the 2nd part. I actually want to do somethng like
> this to delete files:
>
> I am creating a class called config_variables in which i want to have
> an array of dirs of files to delete:
>
> class config_variables {
>
> $oldfilestoremove  = [ "file1", "file2" ]
> $path_to_data = "/tmp"
> $path_to_data2 = "/opt"
>
> }
>
> Then i want to declare another class according to different
> environments. However i would like to do some sort of if condition
> with the path variable and change it according to different
> environments using the tags. The purge-data is a general define i have
> and has a delete function which uses the $name variable and the path
> variable defined below as parameters:
>
> class purge_old_data inherits config_variables {
>
>        purge-data::delete{
>        $oldfilestoremove
>        if tagged(tst_env) or if tagged(stg_env)
>        {
>        path => "$path_to_data",
>        }
>        if tagged(prd_env)
>        {
>        path => "$path_to_data2",
>        }
>
>        }
> }
You can''t use an if statement within a resource declaration only
selectors. So do the if conditional before you declare
purge-data::delete custom resource.

if ... {
  $my_path = $path_to_data
} elsif ... {
  $my_path = $path_to_data2
}

purge-data::delete { $oldfilestoremove:
  path => $my_path,
}

Thanks,

Nan

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Hi,

Thanks for your help. I tried the stuff. It works. Learing somethng
new everday.

On 27 Apr., 19:22, Nan Liu <n...@puppetlabs.com>
wrote:
> On Wed, Apr 27, 2011 at 8:17 AM, linuxbsdfreak
<linuxbsdfr...@gmail.com> wrote:
> > Hi,
>
> > Thanks for your reply. The problem with the tagging is solved. However
> > i am confused with the 2nd part. I actually want to do somethng like
> > this to delete files:
>
> > I am creating a class called config_variables in which i want to have
> > an array of dirs of files to delete:
>
> > class config_variables {
>
> > $oldfilestoremove  = [ "file1", "file2" ]
> > $path_to_data = "/tmp"
> > $path_to_data2 = "/opt"
>
> > }
>
> > Then i want to declare another class according to different
> > environments. However i would like to do some sort of if condition
> > with the path variable and change it according to different
> > environments using the tags. The purge-data is a general define i have
> > and has a delete function which uses the $name variable and the path
> > variable defined below as parameters:
>
> > class purge_old_data inherits config_variables {
>
> >        purge-data::delete{
> >        $oldfilestoremove
> >        if tagged(tst_env) or if tagged(stg_env)
> >        {
> >        path => "$path_to_data",
> >        }
> >        if tagged(prd_env)
> >        {
> >        path => "$path_to_data2",
> >        }
>
> >        }
> > }
>
> You can''t use an if statement within a resource declaration only
> selectors. So do the if conditional before you declare
> purge-data::delete custom resource.
>
> if ... {
>   $my_path = $path_to_data} elsif ... {
>
>   $my_path = $path_to_data2
>
> }
>
> purge-data::delete { $oldfilestoremove:
>   path => $my_path,
>
> }
>
> Thanks,
>
> Nan
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