External Secrets Operator: Vault Dynamic Secrets in Kubernetes Without Sidecars

External Secrets Operator lets you sync HashiCorp Vault dynamic secrets directly into Kubernetes Secrets — no Vault Agent sidecars, no annotation sprawl. You'll learn: How ESO's ExternalSecret and SecretStore CRDs map Vault paths to Kubernetes Secrets Why dynamic secrets (short-lived, auto-rotated) are preferable to static tokens and how ESO handles lease renewal The auth methods ESO supports for talking to Vault — Kubernetes auth vs. AppRole and when to use each Common failure modes: stale secrets after Vault seal, RBAC misconfigs, and refresh interval gotchas How to scope a ClusterSecretStore safely across namespaces without over-permissioning Keywords: External Secrets Operator, HashiCorp Vault Kubernetes integration, dynamic secrets management, Vault sidecar alternative, Kubernetes secrets sync 🎧 Listen, then go deeper — DevOps & Cloud interview-prep ebooks at DevOpsInterview.Cloud