ch huang
2013-Sep-24 06:21 UTC
[Puppet Users] question about override parameter in node define
i expect the file /tmp/conftest content will be "mymaster" not default
"HM"
on node bm ,but fail,anyone can help?
here my init.pp
class hadoop {
require hadoop::params
file { "/tmp/conftest":
ensure => ''file'',
content => "$hadoop::params::master",
}
}
here my node.pp
node ''default'' {
include hadoop
}
node ''bm'' inherits ''default'' {
$hadoop::params::master = ''mymaster''
}
here is my params.pp
class hadoop::params {
$master = $::hostname ? {
default => ''HM'',
}
}
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Rahul Khengare
2013-Sep-24 12:14 UTC
[Puppet Users] Re: question about override parameter in node define
hi ch Huang,
Here in this case you have to use parameterised class concept. Refer
http://docs.puppetlabs.com/guides/parameterized_classes.html for
parameterised classes concept.
You can restructure your manifests to solve your issue.
Refer following manifests,
*init.pp file*
here we pass the *master* parameter to class and inherits params class.
class hadoop (
$master = $hadoop::params::master,
) inherits hadoop::params {
file { "/tmp/conftest":
ensure => ''file'',
content => "${master}",
}
}
*node.pp*
node ''default'' {
class {"hadoop":
# pass the master parameter to hadoop class it will override the
value present in the params file,
# if we are not passing the master parameter then it take default
value present in the params.pp file
master => ''mymaster'',
}
}
node ''bm'' inherits ''default'' {
}
*params.pp*
class hadoop::params {
$master = $::hostname ? {
default => ''HM'',
}
}
Hope this would help.
Thanks and Regards,
Rahul Khengare,
NTT DATA OSS Center, Pune, India.
On Tuesday, September 24, 2013 11:51:29 AM UTC+5:30, ch huang
wrote:>
> i expect the file /tmp/conftest content will be "mymaster" not
default
> "HM" on node bm ,but fail,anyone can help?
>
> here my init.pp
>
> class hadoop {
> require hadoop::params
> file { "/tmp/conftest":
> ensure => ''file'',
> content => "$hadoop::params::master",
> }
> }
> here my node.pp
>
> node ''default'' {
> include hadoop
> }
> node ''bm'' inherits ''default'' {
> $hadoop::params::master = ''mymaster''
> }
>
> here is my params.pp
>
> class hadoop::params {
> $master = $::hostname ? {
> default => ''HM'',
> }
> }
>
>
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jcbollinger
2013-Sep-24 14:47 UTC
[Puppet Users] Re: question about override parameter in node define
On Tuesday, September 24, 2013 1:21:29 AM UTC-5, ch huang wrote:> > i expect the file /tmp/conftest content will be "mymaster" not default > "HM" on node bm ,but fail,anyone can help? > >You cannot assign values to non-local variables. Even if you could, you would not get your desired result because node inheritance does not work the way you hope. The best solution is to feed data to your class from an external source. Class parameters such as Rahul describes are a popular vehicle for doing that, though you can also just load data directly via a data-access function. Chief among such functions in modern Puppet is hiera(). For small-scale testing purposes, however, you can also just bake the data into your classes. Indeed, it looks like you are set up for that already. For example, if you make this change class hadoop::params { $master = $::hostname ? { ''bm'' => ''mymaster'', default => ''HM'', } } then you can remove node ''bm'' altogether, and you will get the expected result. John -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-users+unsubscribe@googlegroups.com. To post to this group, send email to puppet-users@googlegroups.com. Visit this group at http://groups.google.com/group/puppet-users. For more options, visit https://groups.google.com/groups/opt_out.
jcbollinger
2013-Sep-24 14:54 UTC
[Puppet Users] Re: question about override parameter in node define
On Tuesday, September 24, 2013 7:14:52 AM UTC-5, Rahul Khengare wrote:> > hi ch Huang, > Here in this case you have to use parameterised class concept. Refer > http://docs.puppetlabs.com/guides/parameterized_classes.html for > parameterised classes concept. > You can restructure your manifests to solve your issue. > > Refer following manifests, [...] > >Do note, however, that although Rahul''s code should produce the expected result for node ''bm'', it does so by changing the result for *every* node. You don''t need class parameters for that. That could be remedied by a variation that drops node inheritance. Keep your original declaration for the default node, and change node ''bm'' to not inherit anything. Make Rahul''s parameterized-style declaration of class ''hadoop'' the complete contents of node ''bm''s declaration. That should give you the desired result for node ''bm'' without changing the original result on other nodes. John -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-users+unsubscribe@googlegroups.com. To post to this group, send email to puppet-users@googlegroups.com. Visit this group at http://groups.google.com/group/puppet-users. For more options, visit https://groups.google.com/groups/opt_out.