There are four files. We use Kubernetes Secret so that all pods can access it via an environment variable or mount a volume and access as a file. For more details about secrets, please refer to the Working with secrets section in Chapter 2, Walking through Kubernetes Concepts. You can use the kubectl command to load these four files to store to the Kubernetes secret via the following steps:

1. Run the kubectl create command with the --from-file parameter to specify the secrets directory:

$ kubectl create secret generic registry-secrets --from-file secrets/
secret "registry-secrets" created

2. Check the status via the kubectl describe command:

$ kubectl describe secret registry-secrets
Name:         registry-secrets
Namespace:    default
Labels:       <none>
Annotations:  <none>
Type:  Opaque
Data
====
domain.key:       3243 bytes
http.secret:      17 bytes
registry_passwd:  69 bytes
domain.crt:       1899 bytes