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Will S. G.

2012-Mar-02 03:16 UTC

[Puppet Users] Puppet condition based on variable.

I have a template for zabbix_agentd.conf.erb that has the following line in 
it: 

<% if has_variable?( "mysqlsrv" ) then %>
UserParameter=FromDual.MySQL.check,/usr/local/mysql_performance_monitor/FromDualMySQLagent.pl
/usr/local/mysql_performance_monitor/etc/FromDualMySQLagent.conf <% end %>

I defined the variable $mysqlsrv = "true" in node.pp. However, it
seems the
file is really never updated based on the condition. 

Any suggestions how to troubleshoot this issue? I feel a bit lost.

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Denmat

2012-Mar-02 03:51 UTC

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Re: [Puppet Users] Puppet condition based on variable.

Hi,

That is a string you are checking in the has_variable not a Boolean.  So if you
put ''true'' or ''false'' they both pull the var
into existence.

So as far as I recall, you got two options. 

Try declaring the var like so:
$mysqlsrv = true

Or you run the template like this:> <% if has_variable?( "mysqlsrv" ) then %><% if mysqlsrv == ''true'' then ...

Cheers,
Den

On 02/03/2012, at 14:16, "Will S. G." <will@arw.in> wrote:
> I have a template for zabbix_agentd.conf.erb that has the following line in
it:
> 
> <% if has_variable?( "mysqlsrv" ) then %>
>
UserParameter=FromDual.MySQL.check,/usr/local/mysql_performance_monitor/FromDualMySQLagent.pl
/usr/local/mysql_performance_monitor/etc/FromDualMySQLagent.conf <% end %>
> 
> I defined the variable $mysqlsrv = "true" in node.pp. However, it
seems the file is really never updated based on the condition.
> 
> Any suggestions how to troubleshoot this issue? I feel a bit lost.
> -- 
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Will S. G.

2012-Mar-02 04:18 UTC

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Re: [Puppet Users] Puppet condition based on variable.

Thanks Den, 

What if I were to define a string instead of boolean? 

$mysqlsrv = ''mysqlsrv''

That means <% if has_variable?( "mysqlsrv" ) then %> should
work, no?

Even with your recommended solution, I end up with Could not find value for 
''mysqlsrv,'' which is what I ran into while
troubleshooting/experimenting
with the variable, etc.

Any other suggestions? 

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Denmat

2012-Mar-02 05:41 UTC

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Re: [Puppet Users] Puppet condition based on variable.

Right, didn''t properly read your original post. You''re
declaring this in node.pp.

Where are you declaring the template call? Can you paste how you are doing this
so we can see?

http://docs.puppetlabs.com/learning/templates.html#some-simple-erb

In that link puppetlabs talk about the scopes of variables when using templates.
You might need to use scope.lookupvar in your case.

Den

On 02/03/2012, at 15:18, "Will S. G." <will@arw.in> wrote:
> Thanks Den, 
> 
> What if I were to define a string instead of boolean? 
> 
> $mysqlsrv = ''mysqlsrv''
> 
> That means <% if has_variable?( "mysqlsrv" ) then %> should
work, no?
> 
> Even with your recommended solution, I end up with Could not find value for
''mysqlsrv,'' which is what I ran into while
troubleshooting/experimenting with the variable, etc.
> 
> Any other suggestions? 
> -- 
> You received this message because you are subscribed to the Google Groups
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Peter Bukowinski

2012-Mar-02 05:41 UTC

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Re: [Puppet Users] Puppet condition based on variable.

In this case, you should check for the variable''s value, as well:

<% if has_variable?("mysqlsrv") and mysqlsrv ==
''mysqlsrv'' %>

But it sounds like you might be having a variable scoping issue. Where in your
nodes.pp file do you have $mysqlsrv defined?

-- Peter (from phone)

On Mar 1, 2012, at 11:18 PM, "Will S. G." <will@arw.in> wrote:
> Thanks Den, 
> 
> What if I were to define a string instead of boolean? 
> 
> $mysqlsrv = ''mysqlsrv''
> 
> That means <% if has_variable?( "mysqlsrv" ) then %> should
work, no?
> 
> Even with your recommended solution, I end up with Could not find value for
''mysqlsrv,'' which is what I ran into while
troubleshooting/experimenting with the variable, etc.
> 
> Any other suggestions? 
> -- 
> You received this message because you are subscribed to the Google Groups
"Puppet Users" group.
> To view this discussion on the web visit
https://groups.google.com/d/msg/puppet-users/-/lIgz5GOgewYJ.
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Will S. G.

2012-Mar-02 05:54 UTC

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Re: [Puppet Users] Puppet condition based on variable.

I''m not being descriptive, I know. I''ll clarify as
pseudo-code; I''m
essentially attempting to declare a variable in node.pp as such: 

node ''util-mysql0'' inherits default {
        $mysqlsr = [define value]
        ....
} 

So: 

- Define variable
- Create the condition in the template
- If var condition is met. Add line to the file for that node.
- Rinse, lather and repeat. 

As you can see, by defining the variable, I''m attempting to predefine
the
condition. I would like to re-write the template, rather include the extra 
line (the aforementioned) when the variable is defined for the node. If my 
approach is incorrect, I suppose I would ask that you let me know. If not 
then, please let me know what I might be missing.

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denmat

2012-Mar-02 10:50 UTC

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Re: [Puppet Users] Puppet condition based on variable.

Here is an example using inline templates.  Should describe how you can do it.

class myclass {
}

class myclass::config {
  $myvar = "this is class text"
}

class myclass::template {
  include myclass::config

  $myvar = $myclass::config::myvar

  $mytemplate = inline_template("
Here is some text.
Myvar should go here:
<% if has_variable?(''myvar'') -%>
<% if myvar =~ /text/ -%>
<%= myvar %>
this is your node var:
<%= scope.lookupvar(''nodevar'') -%>
<% else -%>
Don''t put text in.
<% end -%>
<% end -%>
")

  notify {$mytemplate: }
}

node default {
  $nodevar = ''this is node text''
  include myclass::template
}

notice: /Stage[main]/Myclass::Template/Notify[
Here is some text.
Myvar should go here:
this is class text
this is your node var:
this is node text]/message: current_value absent, should be
Here is some text.
Myvar should go here:
this is class text
this is your node var:
this is node text (noop)
notice: Class[Myclass::Template]: Would have triggered
''refresh'' from 1 events
notice: Stage[main]: Would have triggered ''refresh'' from 1
events
notice: Finished catalog run in 0.07 seconds

In version 2.7.10 (which I''m using) I get a deprecation warning while
trying to access the node variable - I don''t declare variables that
way so I don''t know off hand how to fix it (tried several ways
quickly).

That should give you an idea anyway.

Den

On Fri, Mar 2, 2012 at 4:54 PM, Will S. G. <will@arw.in>
wrote:> I''m not being descriptive, I know. I''ll clarify as
pseudo-code; I''m
> essentially attempting to declare a variable in node.pp as such:
>
> node ''util-mysql0'' inherits default {
>         $mysqlsr = [define value]
>         ....
> }
>
> So:
>
> - Define variable
> - Create the condition in the template
> - If var condition is met. Add line to the file for that node.
> - Rinse, lather and repeat.
>
> As you can see, by defining the variable, I''m attempting to
predefine the
> condition. I would like to re-write the template, rather include the extra
> line (the aforementioned) when the variable is defined for the node. If my
> approach is incorrect, I suppose I would ask that you let me know. If not
> then, please let me know what I might be missing.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Puppet Users" group.
> To view this discussion on the web visit
> https://groups.google.com/d/msg/puppet-users/-/kT1GluO0QTkJ.
>
> To post to this group, send email to puppet-users@googlegroups.com.
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> puppet-users+unsubscribe@googlegroups.com.
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> http://groups.google.com/group/puppet-users?hl=en.
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Puppet users - Mar 2012 - Puppet condition based on variable.

[Puppet Users] Puppet condition based on variable.

Re: [Puppet Users] Puppet condition based on variable.

Re: [Puppet Users] Puppet condition based on variable.

Re: [Puppet Users] Puppet condition based on variable.

Re: [Puppet Users] Puppet condition based on variable.

Re: [Puppet Users] Puppet condition based on variable.

Re: [Puppet Users] Puppet condition based on variable.