11. Sync secret between name space

11.1 Without tools

Export existing secret in yaml format

kubectl get secret <secret-name> -n <namespace> -o yaml

For example, you can see the below output, put it in a file secret.yaml

apiVersion: v1
data:
  password: dGVzdFBAc3N3b3Jk
  username: dGVzdC11c2Vy
kind: Secret
metadata:
  creationTimestamp: "2022-10-11T21:21:02Z"
  name: test-secret-1
  namespace: testns1
  resourceVersion: "307939"
  uid: 6a8d9a6d-9648-4a39-a362-150e682c9a42
type: Opaque

The only attribute you need to change is namespace

Change namespace: testns1 to namespace: testns2

Then apply the new secert

kubectl apply -f secret.yaml

11.2 With tools

There are three possilbe tools that can sync configMap/secret between namespaces

• config-syncer (aka. kubed) : A tuto of kubed
• reflector
• kubernetes-replicator

No time to test them.