Configmaps or secrets in kubernetes

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containers

Kubernetes

Hello Everyone

I have one query to selecting which is best for Kubernetes.
Pros and Cons between a file symlink and an environment variable for accessing a Secret or ConfigMap?
What should be in a Secret or ConfigMap (e.g. instance name or full API URL such as example or http://example:12345/servicename )? Why?

What I have tried:

I have one query to selecting which is best for Kubernetes.