Topic 9: The Downward API
The downward API is a mechanism that allows containers to consume information about API objects without coupling to the Kubernetes Platform.
Such information includes the Pod’s name, namespace, and resource values.
Containers can consume their metadata from the downward API using environment variables or a volume plug-in.
The pattern often referred to as The Reflection Pattern
There are two ways to expose Pod and Container fields to a running Container:
1. Environment variables
2. Volume files
These two ways of exposing Pod and Container fields are called the “Downward API.”
