Thanks again, Jason. I'll spin some up today and run through some more
docs, tutorias.
On Sat, Sep 27, 2014 at 9:27 AM, Jason Antman <ja...@jasonantman.com> wrote:
> With a very small edge-case asterisk (the puppet Device support, which
> I've never used), yes. The agent is a piece of software that runs (as a
> daemon, via cron, manually, or via some other scheduling mechanism like
> mcollective) on a host ("node" in Puppet nomenclature) and applies catalogs
> to that one node.
>
> There's a good introduction to this at
> https://docs.puppetlabs.com/learning/agent_master_basic.html - I'd also
> encourage you to look through the rest of the Learning Puppet section on
> docs.puppetlabs.com.
>
> On Sat, Sep 27, 2014 at 12:23 PM, Dennis Gearon <gear...@gmail.com> wrote:
>
>> Thanks Jason. If I ever get to 1000 nodes, then I guess I'll have
>> something to worry about, then. LOL! One final question.
>>
>> An 'agent' is really a managed server instance, not a Puppet worker
>> managing something else, (as the word 'Agent' would suggest). So really,
>> Agents only apply catalogs to themselves, right?
>>
>> On Sat, Sep 27, 2014 at 9:07 AM, Jason Antman <ja...@jasonantman.com>
>> wrote:
>>
>>> Agents never control other agents. Aside from supporting technology
>>> (PuppetDB, an ENC if you have one, a database to back PuppetDB), yeah, a
>>> master and N agents is the gist of it.
>>>
>>> There are some docs online (see specifically the "Tuning and Scaling"
>>> section of the Puppet Documentation Index,
>>> https://docs.puppetlabs.com/puppet/#tuning-and-scaling ) about scaling,
>>> and a search of the mailing list archives (as well as Google - there have
>>> been quite a few blog posts on this) should help turn up other options and
>>> experiences.
>>>
>>> Off the top of my head, I believe there are generally two paradigms
>>> used: either clustering/HA for your masters, generally load-balanced from
>>> what I gather, or (what I do) splitting up agents between different masters
>>> (by location, or network, or dev/test/prod). My current infrastructure is
>>> made up of ~450 nodes which are served by three masters - dev, test/QA and
>>> prod. We run every 30 minutes, via mcollective with a set concurrency. The
>>> masters are VMs, running on the same physical hosts as PuppetDB and its
>>> PostgreSQL instance, so I'm quite confident that I could scale each one to
>>> a few thousand nodes before I have to worry about overloading one host. In
>>> addition, since we split dev, test/QA and prod masters, we can deploy
>>> module changes (and puppet/puppetdb/etc. upgrades) to the dev environment,
>>> validate there, promote to test/QA, validate there, and then promote to
>>> prod.
>>>
>>> -Jason
>>>
>>> On Sat, Sep 27, 2014 at 11:03 AM, Dennis Gearon <gear...@gmail.com>
>>> wrote:
>>>
>>>> Been burnnig up the keyboard and spewing packets to search for this
>>>> answer, but haven't seen it.
>>>>
>>>> From what I've read, there is only:
>>>> A/ A Puppet Master
>>>> B/ Infinite number of 'Agent' nodes.
>>>>
>>>> Is this right?
>>>>
>>>> Is there any other kinds of nodes?
>>>>
>>>> Do Agent nodes ever control other nodes?
>>>>
>>>> What happens when the puppet master gets overloaded, how do you cluster
>>>> or use a 'super' master to divide the load?
>>>>
>>>> Thanks for clearning this up for me :-)
>>>>
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