On 2018-08-31 13:33, bert hajee wrote:
Lindsy,
Is it just ment for this use case? I can think of other situations where
in might be vary valuable to fetch a value at run-time on the agent. Now
whenever we have to get the current state, we need to make a fact. If we
can make deferred functions for that that would make things much more
simple. I'm not sure if it the still is "The Puppet way". Like to hear
any thoughts on that.
Bert
Consider a cached catalog - with Deferred values that cached catalog can
stay the same for as long as it is only the deferred values that need to
change (and that they can be obtained locally or from service).
Without use of cached catalog, Deferred values are good for things
that must or are much better suited to be computed fresh on the agent.
- henrik
On Friday, 31 August 2018 02:11:52 UTC+2, Lindsey Smith wrote:
Hi all,
We wanted to let you know about an upcoming capability, the Deferred
type, that is now present in Puppet 6 nightlies and will be part of
the Puppet 6.0 release.
A longstanding request has been to allow agents to fetch data for
themselves at catalog application time. One key use case for this is
getting secrets directly from a store like Conjur, Vault or Consul.
Without this capability the master has to be in the middle and
secret values are passed in catalogs around more than is necessary.
The solution in Puppet 6 is the Deferred type. A Deferred value
describes a function call to be made in the future and when placing
it in a catalog the agent will replace it with the result of calling
the wrapped function before it continues with application as normal.
Of course, for the agent to actually fetch data from a keystore the
function has to exist on the agent side and be loaded during a run.
In Puppet 6.0, these functions will be downloaded from the master
via pluginsync from the lib/puppet/functionsdirectory in modules,
then loaded during an agent run. Though Deferred is intended
primarily for agents running with a master, it does work in the same
way with an agent only.
https://gist.github.com/turbodog/06d3fecef403bfefd9c8174ede4d9174
<https://gist.github.com/turbodog/06d3fecef403bfefd9c8174ede4d9174>has
more explanation and walks you through a simple Deferred function
example. Work on this is tracked in PUP-8711
<https://tickets.puppetlabs.com/browse/PUP-8711>and updating the
Puppet specification for Deferred is a work in progress happening
here: https://github.com/puppetlabs/puppet-specifications/pull/122
<https://github.com/puppetlabs/puppet-specifications/pull/122>
If you have other use cases for Deferred we’d love to hear what
those are.
Lindsey
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