Re: [Puppet Users] Noob question about the ${name} variable
Hi John,
Read my previous reply,
file { '/etc/httpd/conf.d/ssl.conf' :
ensure = file ,
mode= 0644 ,
owner = 0 ,
group = 0 ,
content = template ( ${module_name}${name}.erb ) ,
notify = Service['httpd'] ,
require = Package['httpd'] ,
}
The *'/'* is missing in between ${module_name} and ${name}
Thanks and Regards,
Rahul Khengare
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Re: [Puppet Users] Noob question about the ${name} variable
On 2013-09-26, at 0303, Rahul Khengare rahulk1...@gmail.com wrote:
Hi John,
Read my previous reply,
file { '/etc/httpd/conf.d/ssl.conf' :
ensure = file ,
mode= 0644 ,
owner = 0 ,
group = 0 ,
content = template ( ${module_name}${name}.erb ) ,
notify = Service['httpd'] ,
require = Package['httpd'] ,
}
The '/' is missing in between ${module_name} and ${name}
Sorry, but I wrote the line this way specifically because the first character
of the value of $name is /. Adding an extra / between ${module_name} and
${name} would result in apache//xxx.erb. Presumably the // wouldn't hurt
anything (the Linux kernel ignores the empty directory element between the two
slashes when resolving the filename), but it wouldn't have helped either.
I did, however, figure out what the problem was. In this case, it was confusion
caused by either less-than-perfect documentation, or my own less-than-perfect
understanding of that documentation.
The confusion has to do with what the $name variable actually is. Essentially,
it does not refer to the item you're declaring (in this case, a file.) It
refers to the object WITHIN WHICH you are declaring it.
So for a file declared within a class...
class apache {
file { 'blah' :
ensure = file ,
content = template ( ${module_name}${name}.erb ) ,
}
}
the value of $name is apache (the name of the class.)
And for a file declared within a define...
class apache {
define configfile {
file { $name :
ensure = file ,
content = template ( ${module_name}${name}.erb ) ,
}
}
configfile { '/etc/httpd/conf.d/01_aaa.conf' : }
configfile { '/etc/httpd/conf.d/02_bbb.conf' : }
}
the value of $name, in both locations, is the value with which that define is
later instantiated.
So in the second example, $name would be either /etc/httpd/conf.d/01_aaa.conf
or /etc/httpd/conf.d/02_bbb.conf, depending on which configfile object is
being instantiated at the time.
The real problem I was trying to solve is that I didn't want to have to type
each filename twice, primarily because it opens up a potential source of errors
if the names aren't typed exactly the same. Creating a wrapper around the
file object allows the same name to be used multiple times, without having to
worry about the name potentially not being identical. It also allowed me to
include several other elements (such as owner, mode, and notify) which
would otherwise have had to be duplicated.
My thanks to everybody who offered advice.
--
John Simpson j...@voalte.com
Unix System/VM Developer and Engineering Operations, Voalte
+1 (941) 312-2830 x148
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[Puppet Users] Noob question about the ${name} variable
Greetings.
When defining a file resource, why does the ${name} variable sometimes expand
to the filename being maintained, and sometimes to the module name?
Examples (in a module which, for simplicity, we will call apache) ...
file { '/etc/httpd/conf/httpd.conf' :
ensure = file ,
source = puppet:///modules/${module_name}${name} ,
}
Here $name expands to /etc/httpd/conf/httpd.conf, so source expands to
puppet:///modules/apache/etc/httpd/conf/httpd.conf.
file { '/etc/httpd/conf.d/ssl.conf' :
ensure = file ,
content = template ( ${module_name}{$name}.erb ) ,
}
Here $name expands to apache, so the filename passed to template() is
apacheapache.erb, rather than the expected and desired value
apache/etc/httpd/conf.d/ssl.conf.erb.
Why does $name expand differently in these cases, and where did I miss this in
the documentation?
--
John Simpson j...@voalte.com
Unix System/VM Developer and Engineering Operations, Voalte
+1 (941) 312-2830 x148
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Re: [Puppet Users] Noob question about the ${name} variable
On Sep 25, 2013, at 8:12 AM, John Simpson j...@voalte.com wrote:
file { '/etc/httpd/conf.d/ssl.conf' :
ensure = file ,
content = template ( ${module_name}{$name}.erb ) ,
}
Here $name expands to apache, so the filename passed to template() is
apacheapache.erb, rather than the expected and desired value
apache/etc/httpd/conf.d/ssl.conf.erb.
Is this the literal syntax? Because you have {$name} instead of ${name}.
I can't explain why the former would expand the way it does, unless the braces
around the variable name have special meaning. I would expect you'd get the
literal braces in the expanded value. Not a real answer, but it does look
unintentional.
--
Brian Lalor
bla...@bravo5.org
http://github.com/blalor
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Re: [Puppet Users] Noob question about the ${name} variable
On 2013-09-25, at 0819, Brian Lalor bla...@bravo5.org wrote:
On Sep 25, 2013, at 8:12 AM, John Simpson j...@voalte.com wrote:
file { '/etc/httpd/conf.d/ssl.conf' :
ensure = file ,
content = template ( ${module_name}{$name}.erb ) ,
}
Here $name expands to apache, so the filename passed to template() is
apacheapache.erb, rather than the expected and desired value
apache/etc/httpd/conf.d/ssl.conf.erb.
Is this the literal syntax? Because you have {$name} instead of ${name}.
I can't explain why the former would expand the way it does, unless the
braces around the variable name have special meaning. I would expect you'd
get the literal braces in the expanded value. Not a real answer, but it does
look unintentional.
Sorry, I tried to remove a bunch of extraneous detail from my first message and
fat-fingered the variable.
The actual syntax, copied and pasted from the module, is:
file { '/etc/httpd/conf.d/ssl.conf' :
ensure = file ,
mode= 0644 ,
owner = 0 ,
group = 0 ,
content = template ( ${module_name}${name}.erb ) ,
notify = Service['httpd'] ,
require = Package['httpd'] ,
}
When I try to apply this on my test machine, I get...
# puppet agent -t
Info: Retrieving plugin
Info: Loading facts in /var/lib/puppet/lib/facter/os_maj_version.rb
Error: Could not retrieve catalog from remote server: Error 400 on SERVER:
Could not find template 'apacheapache.erb' at
/home/jms1/puppet/apache/manifests/init.pp:21 on node xxx
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run
--
John Simpson j...@voalte.com
Unix System/VM Developer and Engineering Operations, Voalte
+1 (941) 312-2830 x148
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