External Secrets Operator: Syncing Secrets into Kubernetes
Shriira Press
How the External Secrets Operator turns secrets scattered across Vault and the cloud into native Kubernetes Secrets that stay in sync.
Welcome to External Secrets Operator: Syncing Secrets into Kubernetes.
Almost every cluster needs credentials it should never have to store itself — database passwords, API tokens, TLS keys — and almost every organisation already keeps those credentials somewhere safer, in AWS Secrets Manager, HashiCorp Vault, Google Secret Manager, or Azure Key Vault. The External Secrets Operator is the bridge between the two worlds. It is a Kubernetes operator that reads secrets from an external system of record and projects them into ordinary Kubernetes Secret objects, keeping them refreshed as the source changes. This book begins with the problem of secret sprawl and why a native Secret is still the thing your pods want to consume. From there it works through the operator's architecture as a set of controllers and custom resources, then through the two halves of every setup: the SecretStore that holds connection and authentication details, and the ExternalSecret that declares what to fetch. Later chapters cover the provider ecosystem and its authentication models, the templating engine that reshapes raw values into usable files, pushing secrets back out with PushSecret, and finally how to run the operator well in production.
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— Shriira Press