In this chapter, we looked at how to take advantage of the declarative nature of Kubernetes in detail and managing our application through specification files. We also looked at Annotations, ConfigMap, and Secrets and how those can be created and then used from within Pods. We closed the chapter with updating our Python and Node.js applications to use ConfigMaps to run the example code we set up previously, and looked briefly at how to leverage the built-in JSONPATH within kubectl to make that tool more immediately powerful at providing the specific information you want.
