How to securely store secrets in Kubernetes if they are currently stored in ConfigMap and accessible to everyone with read access to the namespace?

Storing secrets in Kubernetes in ConfigMap is insecure because ConfigMap does not encrypt data and is accessible to anyone with read access to the namespace. For secure secret storage, it is recommended to:

• Use Kubernetes Secrets, which store data in base64 and can be additionally encrypted at the etcd level.
• Enable encryption of secrets at rest on the etcd side through kube-apiserver configuration.
• Restrict access to secrets using RBAC, granting permissions only to necessary services and users.
• Consider integrating with external secret management systems, such as HashiCorp Vault, AWS KMS, Azure Key Vault, which provide centralized and secure storage and rotation of secrets.

Example of using Kubernetes Secret:

apiVersion: v1
kind: Secret
metadata:
  name: my-secret
type: Opaque
data:
  password: cGFzc3dvcmQ= # base64 encoded 'password'

Thus, switching from ConfigMap to Secrets and configuring RBAC will significantly enhance the security of confidential data.