Kubernetes Configuration Patterns 101
ConfigMap
A ConfigMap is an API object that stores non-confidential data in key-value pairs. Pods can consume ConfigMaps as environment variables, command-line arguments, or as configuration files in a volume.
A ConfigMap allows you to decouple environment-specific configuration from your Container Images, making your applications easily portable. The data stored in a ConfigMap cannot exceed 1 MiB.
If you need to store settings larger than this limit, consider mounting a volume or using a separate database or file service.
There are four different ways that you can use a ConfigMap to configure a container inside a Pod:
1. Inside a container command and args
2. Environment variables for a container
3. Add a file in read-only volume for the application to read
4. Write code to run inside the Pod that uses the Kubernetes API to read a ConfigMap
