Managing secrets in Kubernetes is a critical operational challenge. This guide explores the major approaches: storing secrets in etcd (the default, but with encryption at rest), using Sealed Secrets with kubeseal and ArgoCD for GitOps workflows, leveraging the External Secrets Operator (ESO) to sync secrets from external providers, integrating HashiCorp Vault for a dedicated secrets management platform, and using CSI drivers to mount secrets directly from storage systems. Each approach has trade-offs in terms of security, complexity, and operational overhead. For example, Sealed Secrets enables secure GitOps but adds encryption key management, while Vault provides robust access control but requires additional infrastructure. Understanding these options is essential for building a secure and scalable Kubernetes platform. This comparison helps teams choose the right strategy based on their security requirements, team expertise, and existing tooling.
This article provides a comprehensive overview of Kubernetes secrets management solutions, covering etcd, Sealed Secrets (kubeseal, ArgoCD), External Secrets Operator (ESO), HashiCorp Vault, and CSI drivers. It compares their architectures, use cases, and security implications, making it a valuable resource for DevOps and security teams. The topic is evergreen and commercially critical for any organization running Kubernetes in production.