[Puppet Users] Generating dhcp/pxe configuration from puppet

On 18/04/12 08:22, Christian Requena wrote:
Hello,

I want to generate my infrastructure's dhcp/pxe config from puppet,
but to go through the node definitions? Btw. we only use explicit
definitions, no regexp. So everything is explicit.

I thought about using Puppet::Parser...something ... any hints?


Thanks for you help!
Christian
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On Apr 18, 10:22 am, Luke Bigum wrote:
If you wanted to do this all in Puppet, you could take the same approach
that people do with Nagios an use exported resources. Have each of your
nodes export some kind of resource that describes what it's DHCP
configuration would be based on it's IP and MAC address Facts, then
collect those resources on your DHCP server and write out your config
file(s).

http://docs.puppetlabs.com/guides/exported_resources.html

If you wanted to do this outside of Puppet then you could parse all of
your node's Facts cache (/var/lib/puppet/yaml/facts on my machine) but
that assumes all the information you need is in Facter.

On 18/04/12 08:22, Christian Requena wrote:








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On 20/04/12 14:57, Christian Requena wrote:
Hi,

I set the whole thing up and got not the expected results. The thing
is, that:

"It’s important to mention here that you will only get exported
resources from hosts whose configurations have been compiled. If hostB
exports a resource but hostB has never connected to the server, then
no host will get that exported resource."

That means that the nodes must be already installed in order to use
the information. I need this information mainly from the nodes that
are not existant yet. I want to boot them using PXE and run the whole
installation procedure afterwards.

I want to describe the nodes in a nodes.pp and from there setup DHCP
and PXE for them.

Any other hints?

Cheers,
Christian

On Apr 18, 10:22 am, Luke Bigumwrote:

On 04/20/2012 10:15 AM, Luke Bigum wrote:
Ahh, I see, I was running under the assumption that you already had
Puppet Agents checking in.

How do you imagine this would work perfectly for you? Would you write
node definitions in nodes.pp, then a Puppet Agent would do the
DHCP/PXE on a specific server?

If so it sounds like you have nodes.pp as your "source of truth" for
all your servers, and you want to feed DHCP and PXE with all your node
information as a whole. That's pretty difficult to solve in Puppet
because no node knows about another node, defined or otherwise (unless
you somehow advertise it's there with exported resources).

Maybe you could write something that transferred your nodes.pp file to
your DHCP server, then Puppet runs scripts to parse nodes.pp into the
right DNS/DHCP config. It would probably be faster to write this
(Perl), but I consider it a bit hacky - for every new server you're
putting information into Puppet manifests only to pull it back out again.

If you've got the time I'd suggest you pull your source of truth out
of Puppet and into another source like an external node classifier
(some people use LDAP) or an external data source like Hiera. It would
be a bit more work but might be easier to work with in the long run,
as then you have a simpler problem to solve when you want to add your
nodes into Software X in a few months.

Hope that helps,

-Luke

Hi,

I set the whole thing up and got not the expected results. The thing
is, that:

"It’s important to mention here that you will only get exported
resources from hosts whose configurations have been compiled. If hostB
exports a resource but hostB has never connected to the server, then
no host will get that exported resource."

That means that the nodes must be already installed in order to use
the information. I need this information mainly from the nodes that
are not existant yet. I want to boot them using PXE and run the whole
installation procedure afterwards.

I want to describe the nodes in a nodes.pp and from there setup DHCP
and PXE for them.

Any other hints?

Cheers,
Christian
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On Apr 18, 12:22 am, Christian Requena wrote:
Hello,

I want to generate my infrastructure's dhcp/pxe config from puppet, but
to go through the node definitions?   Btw. we only use explicit
definitions, no regexp. So everything is explicit.

I thought about using Puppet::Parser...something ... any hints?

Thanks for you help!
Christian