In most examples about using secrets in Kubernetes, you can find similar examples:
apiVersion: v1
kind: Secret
metadata:
name: mysecret
type: Opaque
data:
username: User
password: **********
What is the purpose of type: Opaque in the definition above? What other types (and for which use cases) are possible to specify there?
All types:
SecretType = "Opaque" // Opaque (arbitrary data; default)
SecretType = "kubernetes.io/service-account-token" // Kubernetes auth token
SecretType = "kubernetes.io/dockercfg" // Docker registry auth
SecretType = "kubernetes.io/dockerconfigjson" // Latest Docker registry auth
To learn more, see Secrets design document.
The source code lists all the types:
https://github.com/kubernetes/kubernetes/blob/release-1.14/pkg/apis/core/types.go#L4447