Standard for exposing storage systems to containerized workloads.
Maps a Service to the contents of the externalName field (e.g., DNS name).
The document you're referring to is likely a comprehensive guide to Kubernetes, a popular container orchestration system. While I couldn't find a specific PDF titled "50 Kubernetes Concepts Every DevOps Engineer Should Know," I can provide you with an outline of key Kubernetes concepts that every DevOps engineer should know: