I want to create a secret for my kubernetes cluster. So I composed following dummy-secret.yaml file:

apiVersion: v1
kind: Secret
metadata:
  name: dummy-secret
type: Opaque
data:
  API_KEY: bWVnYV9zZWNyZXRfa2V5
  API_SECRET: cmVhbGx5X3NlY3JldF92YWx1ZTE=

When I run kubectl create -f dummy-secret.yaml I receive back following message:

Error from server (BadRequest): error when creating "dummy-secret.yaml": Secret in version "v1" cannot be handled as a Secret: v1.Secret: Data: decode base64: illegal base64 data at input byte 8, error found in #10 byte of ...|Q89_Hj1Aq","API_SECR|..., bigger context ...|sion":"v1","data":{"API_KEY":"af76fsdK_cQ89_Hj1Aq","API_SECRET":"bsdfmkwegwegwe"},"kind":"Secret","m|...

Not sure why it happens.

As I understood, I need to encode all values under the data key in the yaml file. So I did base64 encoding, but kubernetes still doesn't handle the yaml secret file as I expect.

UPDATE:

I used this command to encode data values on my mac:

echo -n 'mega_secret_key' | openssl base64

After a while I want to return back to this question and leave an answer with a reference to official kubernetes docs:

echo -n 'admin' | base64
YWRtaW4=
echo -n '1f2d1e2e67df' | base64
MWYyZDFlMmU2N2Rm

Pay extra attention to -n, because it guaranties that after decoding your secret key will not contain 'new line symbol'.