This email is only of interest to Labs project admins; Tool-Labs users
can disregard this entirely.
tl;dr:
Don't set instance puppet variables using the puppet config page;
instead use the hiera pages of the form
https://wikitech.wikimedia.org/wiki/Hiera:<project>/host/<instance>
The whole story:
Until recently, the recommended way to specify e.g. a puppet server on
Labs was via a global variable set on the 'configure' panel in Wikitech.
That panel was designed several Puppet versions ago; modern puppet
discourages use of global variables. Instead, we're going to configure
everything via hiera, which is the built-in cascading database puppet
uses to configure classes.
This will have quite a few advantages, but the main one is that this
gets us a bit closer to being able to adopt the new Horizon-based puppet
management system that I'm in the process of writing. It's also one of
the last steps on the road to eliminating a whole pile of ldap dependencies.
Right now I'm hunting down all the puppet globals currently set,
removing them, and adding equivalent hiera settings. In a day or two
the puppet variable feature on wikitech will disappear entirely, but
please don't use it in the meantime. If you're hunting for a setting,
look on the hiera page for your project or instance.
For project-wide hiera config, pages have this format:
https://wikitech.wikimedia.org/wiki/Hiera:<project>
For instance-specific hiera, the url looks like this:
https://wikitech.wikimedia.org/wiki/Hiera:<project>/host/<instance>
Those hiera pages are simple yaml, and setting a single param is even
simpler. Here's an example, from
https://wikitech.wikimedia.org/wiki/Hiera:Ttmserver/host/ttmserver-mediawiki01:
---
"role::salt::minions::salt_master": ttmserver-salt01.eqiad.wmflabs
"role::salt::minions::salt_finger":
42:bb:24:ad:a5:75:86:95:db:da:dd:33:c5:90:5d:3e
That's it!
I realize this is fairly arcane -- don't hesitate to respond with
questions or find me on IRC if you get stuck. In a few weeks we should
be back to having a friendly, web-based system, one that should make a
bit more sense.
-Andrew
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