Kubernetes originally just supported one workload controller, the ReplicationController, which was designed for elastic stateless workloads with fungible replicas. Shortly after we open-sourced Kubernetes we started to discuss how to add support for additional kinds of workloads
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Aside on "template": a "template" is a pattern used to make copies of the same shape. I think the Kubernetes "Pod template" usage is true to that colloquial definition, but typical CS usage implies parameterization and/or macro expansion, so maybe "prototype" would be better
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The idea of explicitly modeling state so that it can be externally controlled and observed is a key principle of Cloud Native. I originally included it in a longer form of the definition I wrote for CNCF: https://github.com/cncf/toc/blob/master/DEFINITION.md …
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The principle can also be applied to workflow systems and configuration management (e.g., see https://github.com/kubernetes/community/blob/master/contributors/design-proposals/architecture/declarative-application-management.md …). Embodying these as code is powerful, but with great power comes great responsibility, since it obstructs external tooling and automation
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