I'm trying to further my understanding of the Orchestrate runner, and the
way salt can use dependencies and ordering across boxes. For an example,
imagine a legacy .NET MVC based web app, with multiple IIS nodes up front,
some batch processing nodes and a monolithic SQL Server DB. I might create
build artifacts for each of these out of a pipeline:
* bin folder for the web app (wrapped in a chocolatey package or MSI etc)
* bin folder for some back end windows services (wrapped in a chocolatey
package or MSI etc)
* xml config and sql scripts for the database (checks for changes or
explicitly versioned)
The nature of the dependencies might be:
* If the database requires an upgrade, we want to stop processing new batch
processing tasks, and wait until the current ones are done
* When we're ready to go, redirect to a maintenance message at the front end
* Kick off the upgrade of all 3 layers in parallel
Importantly, in this example if no DB upgrade is required, there's no need
to pause the batch tasks. It might be a simple upgrade of the web nodes, or
one of the batch processing services.
Reading through the doco
<http://docs.saltstack.com/en/latest/topics/tutorials/states_pt5.html#function> on
the orchestrate runner, it looks like there's 2 tools available, functions
and state. I'm trying to understand how the type of scenario I've described
here fits into these 2 approaches. It seems like I need a combination of
the 2. For example:
* Use state to find out if component x is out of date/requires an upgrade
* If so, use a function to send a message to another node
That seems like an awkward combination? Are there any examples around that
cover this in more detail? Obviously the monolithic architecture is the
major problem here, and everything would be easier without so many
dependencies between the nodes, but that's not a realistic change right now.
I've found this post, which mentions inter minion messaging, but that seems
like it might get messy to manage:
https://groups.google.com/forum/#!searchin/salt-users/orchestrate/salt-users/q3A_Kx6gZCg/BqEFZCVKniMJ
Any thoughts or suggestions would be really appreciated.
Cheers,
Eddie
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