Kubernetes in Action

Chapter 7. ConfigMaps and Secrets: configuring applications

This chapter covers

• Changing the main process of a container
• Passing command-line options to the app
• Setting environment variables exposed to the app
• Configuring apps through ConfigMaps
• Passing sensitive information through Secrets

Up to now you haven’t had to pass any kind of configuration data to the apps you’ve run in the exercises in this book. Because almost all apps require configuration (settings that differ between deployed instances, credentials for accessing external systems, and so on), which shouldn’t be baked into the built app itself, let’s see how to pass configuration options to your app when running it in Kubernetes.

7.1. Configuring containerized applications

Before ...