This created a monolithic configuration and tool ecosystem. Even frameworks like mapreduce and services on top of Borg like BorgCron had to use BCL and borgcfg to interact with Borg. Getting-started tools generated BCL
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I wrote an overview of the motivation and principles for the configuration design in https://github.com/kubernetes/community/blob/master/contributors/design-proposals/architecture/declarative-application-management.md …. The original draft of that also contained sketches of what became https://github.com/kubernetes-sigs/application … andhttps://github.com/kubernetes-sigs/kustomize …
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Whereas Apply facilitates collaborative config authoring between humans and machines (thanks to @originalavalamp for that description), kustomize enables collaboration among humans, by facilitating modification of unchanged base prototype/seed configurations.
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The declarative API, Apply, and kustomize facilitate maintaining configuration as YAML or JSON or proto, amenable to manipulation by tools, rather than as YAML marked up with macros, complex configuration languages, or scripts written in general-purpose programming language.
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On one hand, the ~100 tools that have been developed show that the decoupling of config format and the API has worked. OTOH, it shows there are still gaps. With work like diff and dry run (https://github.com/kubernetes/enhancements/pull/893 …) and prune (https://github.com/kubernetes/enhancements/pull/810 …), we're working to close them
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A list of tools can be found here: https://docs.google.com/spreadsheets/d/1FCgqz1Ci7_VCz_wdh8vBitZ3giBtac_H8SBw4uxnrsE/edit#gid=0 …. I just added another 20 or so that I've seen.
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This thread is already the longest yet, so I'll start another later with configuration terminology: declarative vs intent, macros vs config languages, packages vs stacks, prototypes vs templates, whitebox vs blackbox, overlays, lifecycle directives, etc.
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End of conversation
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