Create a new Secret using a literal value:
kubectl create secret generic db-creds --from-literal=pwd=s3cre!
Create a new Secret using an .env file:
kubectl create secret generic db-creds --from-env-file=secret.env
Create a new Secret using an SSH key:
kubectl create secret generic ssh-key --from-file=id_rsa=~/.ssh/id_rsa
Encoding a literal value in base64 (compare that with the first secret):
echo -n 's3cre!' | base64