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andreash

2010-May-21 23:32 UTC

[Puppet Users] getting started with puppet: overriding roles

hi there,

i''m not sure as to how to call the subject of this post, as
i''m
totally new to puppet -- so please forgive me if this is
misleading ...

for my servers, i''m planning to do something like this (pseudo-code):

class (?) base-config:
    include ntp::client
    include resolver
    ...

all servers should by default include the base-config class.

however, for the node which has the role "ntpd-server", i
don''t want
ntp::client to be included, but rather ntp::server.

how can i do this?

my ntp module looks like this:

class ntp {
    package { ''openntpd'':
         ensure => latest
    }

    service { ''openntpd'':
        ensure => running,
    }
    $ntpserverip = ''192.168.1.1'' # this is somehow to be
replaced with
the
                            # actual ip of the ntpd server
    class client {
        $role = ''CLIENT''
    }
    class server {
        $role = ''SERVER''
    }
    file { "/etc/openntpd/ntpd.conf":
        template("ntp/ntpd.conf.erb")
    }
}

and the template looks like this:

<% if role == "SERVER" %>
    listen on <%= ntpserverip %>
    server ptbtime1.ptb.de
    server ptbtime2.ptb.de
    server ptbtime3.ptb.de
<% end %>

<% if role == "CLIENT" %>
    server <%= ntpserverip %>
<% end %>

to summarize:

question 1: how can i make sure that the server which shall be
openntpd server has $role = ''SERVER'' and all others have role
''CLIENT'' ?

question 2: how can i include the ip of the ntp server as $ntpserverip
without having to manually set it?

question 3: what else did i do wrong?

i just found out about puppet, and am really excited about it. looks
like a great helper even for a rather small (~15 machines (virtual +
physical) in total) environment.

thanks for your insight!

Andreas.

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Daniel Pittman

2010-May-22 02:54 UTC

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Re: [Puppet Users] getting started with puppet: overriding roles

andreash <hilboll@gmail.com> writes:
> i''m not sure as to how to call the subject of this post, as
i''m totally new
> to puppet -- so please forgive me if this is misleading ...
>
> for my servers, i''m planning to do something like this
(pseudo-code):
>
> class (?) base-config:
>     include ntp::client
>     include resolver
>     ...
>
> all servers should by default include the base-config class.
I would suggest, instead, this:

  define base ($ntp, ...) {
    case $ntp {
      ''master'': { include ntp::master }
      ...
      default: { fail("sorry, ntp $ntp is an unknown value") }
    }
  }


[...]
> question 1: how can i make sure that the server which shall be
> openntpd server has $role = ''SERVER'' and all others have
role > ''CLIENT'' ?
Essentially, use ''fail'' when it isn''t set.  You can
pull this up a bit by, for
example, using the define there without a default value, but it essentially
comes down to the same thing.
> question 2: how can i include the ip of the ntp server as $ntpserverip
> without having to manually set it?
You can''t.  At least, not trivially: puppet doesn''t let you
ask questions like
"what is the IP address of the server(s) including the ntp::master
class".

Your choices come down to writing it in the manifest somewhere, or using a
fact or external tool that works it out for you.
> question 3: what else did i do wrong?
Nothing I can see; when *I* started this I used node inheritance, which is a
mistake, because it is useless.  Your approach isn''t. :)

        Daniel

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               ♽ made with 100 percent post-consumer electrons

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Silviu Paragina

2010-May-25 00:32 UTC

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Re: [Puppet Users] getting started with puppet: overriding roles

On 22.05.2010 02:32, andreash wrote:> hi there,
>
> i''m not sure as to how to call the subject of this post, as
i''m
> totally new to puppet -- so please forgive me if this is
> misleading ...
>
> for my servers, i''m planning to do something like this
(pseudo-code):
>
> class (?) base-config:
>      include ntp::client
>      include resolver
>      ...
>
> all servers should by default include the base-config class.
>
> however, for the node which has the role "ntpd-server", i
don''t want
> ntp::client to be included, but rather ntp::server.
>
> how can i do this?
>
> my ntp module looks like this:
>
> class ntp {
>      package { ''openntpd'':
>           ensure =>  latest
>      }
>
>      service { ''openntpd'':
>          ensure =>  running,
>      }
>      $ntpserverip = ''192.168.1.1'' # this is somehow to be
replaced with
> the
>                              # actual ip of the ntpd server
>    You may have some success of setting this ip address automatically with 
exported resources. You export the resources in the server class, and 
you realize them on the client. Check out 
http://docs.puppetlabs.com/guides/exported_resources.html . Till now I 
haven''t seen this used to set up ntp, but I think it might be possible 
with the help of the concat module.


Silviu

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Dan Bode

2010-May-25 00:39 UTC

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Re: [Puppet Users] getting started with puppet: overriding roles

On Fri, May 21, 2010 at 4:32 PM, andreash <hilboll@gmail.com> wrote:
> hi there,
>
> i''m not sure as to how to call the subject of this post, as
i''m
> totally new to puppet -- so please forgive me if this is
> misleading ...
>
> for my servers, i''m planning to do something like this
(pseudo-code):
>
> class (?) base-config:
>    include ntp::client
>    include resolver
>    ...
>
> all servers should by default include the base-config class.
>
> however, for the node which has the role "ntpd-server", i
don''t want
> ntp::client to be included, but rather ntp::server.
>
> how can i do this?
>
you can include both a parent and child class in puppet and puppet is smart
enough to apply all of the overridden attributes.

I use this fact sometimes in combination with an external node classifier
(like the dashboard) to override resources from parent groups.

I also opened a feature on the Dashboard to better support this kind of
behavior.

http://projects.puppetlabs.com/issues/3675


> my ntp module looks like this:
>
> class ntp {
>    package { ''openntpd'':
>         ensure => latest
>    }
>
>    service { ''openntpd'':
>        ensure => running,
>    }
>    $ntpserverip = ''192.168.1.1'' # this is somehow to be
replaced with
> the
>                            # actual ip of the ntpd server
>    class client {
>        $role = ''CLIENT''
>    }
>    class server {
>        $role = ''SERVER''
>    }
>    file { "/etc/openntpd/ntpd.conf":
>        template("ntp/ntpd.conf.erb")
>    }
> }
>
> and the template looks like this:
>
> <% if role == "SERVER" %>
>    listen on <%= ntpserverip %>
>    server ptbtime1.ptb.de
>    server ptbtime2.ptb.de
>    server ptbtime3.ptb.de
> <% end %>
>
> <% if role == "CLIENT" %>
>    server <%= ntpserverip %>
> <% end %>
>
> to summarize:
>
> question 1: how can i make sure that the server which shall be
> openntpd server has $role = ''SERVER'' and all others have
role > ''CLIENT'' ?
>
> question 2: how can i include the ip of the ntp server as $ntpserverip
> without having to manually set it?
>
> question 3: what else did i do wrong?
>
> i just found out about puppet, and am really excited about it. looks
> like a great helper even for a rather small (~15 machines (virtual +
> physical) in total) environment.
>
> thanks for your insight!
>
> Andreas.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Puppet Users" group.
> To post to this group, send email to puppet-users@googlegroups.com.
> To unsubscribe from this group, send email to
>
puppet-users+unsubscribe@googlegroups.com<puppet-users%2Bunsubscribe@googlegroups.com>
> .
> For more options, visit this group at
> http://groups.google.com/group/puppet-users?hl=en.
>
>
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Puppet users - May 2010 - getting started with puppet: overriding roles

[Puppet Users] getting started with puppet: overriding roles

Re: [Puppet Users] getting started with puppet: overriding roles

Re: [Puppet Users] getting started with puppet: overriding roles

Re: [Puppet Users] getting started with puppet: overriding roles