On Monday, April 20, 2015 at 10:49:28 PM UTC+10, Pete Brown wrote:
>
> Comments inline.
>
> On 9 Mar 2015 17:19, "Alex Harvey" <alexh...@gmail.com <javascript:>>
> wrote:
>
> > I have two questions:
> >
> > Question #1. Most puppet cloud solutions typically a base class
> that configures services common to all nodes like the resolver, Nagios,
> LDAP, etc. These classes all depend on the existence of external services
> to function (i.e. a DNS server; a DHCP server; a Nagios server; an LDAP
> server; and a Logstash system). Without these services, puppet is expected
> to fail as it applies the said base class.
> >
> > Now imagine there's a role that builds a front end web server that
> applies a profile that includes the base class.
> >
> > If we try to apply that class in a vagrant environment it fails, unless:
> >
> > 1) Our vagrant model environment itself firstly provides a DNS, Nagios,
> LDAP server - I imagine no one actually does this because no one would have
> a development laptop with sufficient grunt to spin up all these services
> simultaneously, and not to mention the time it would take to spin them all
> up.
>
> You are using puppet to manage your cloud instances right?
> If you use images for your instances (using something like packer and
> provisioning them with puppet) they will load up pretty quickly.
> You could set dependencies on the instances each instance requires.
> So your instances become just another resource.
>
I think you are misunderstanding the problem.
Allow me to add some example code that might make it clearer.
Imagine I have a base class that includes a FreeIPA client class and a
metrics colllection class:
class base {
...
include freeipa::client
include metrics::client
}
Assume that both the FreeIPA client and metrics client classes manage
services or sets of services, and these services won't start unless there
exists a FreeIPA server and a metrics server on the network.
Let's assume further that I don't want my production FreeIPA or metrics
servers to be polluted with data from short-lived developer vagrant
instances.
So back to my questions,
1) How can I run up this instance in vagrant without building on my laptop
either real external services (FreeIPA & metrics collection) or mock
services that pretend to be the real thing (and, I have no idea how I would
actually build a mock FreeIPA service but I suppose it's one solution in
theory).
2) (More crucially) How can this chicken-egg problem be resolved when
building the first instances in my empty cloud at the start of the project.
If I build the FreeIPA server first, it will fail because it needs the
metrics collection server. If I build the metrics server first, it fails
because it needs the FreeIPA server.
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