3.MD

kubectl config use-context cluster1-admin@cluster1

k create ns dev-db
k create secret -n dev-db generic dbpassword --from-literal pwd=my-secret-pwd
k run db-pod --namespace dev-db --labels type=db --image mysql:8.0 --dry-run=client -o yaml >3.yaml

Edit definition file and add env variable to have

#  vim  3.yaml
apiVersion: v1
kind: Pod
metadata:
  labels:
    type: db
  name: db-pod
  namespace: dev-db
spec:
  containers:
  - image: mysql:8.0
    name: db-pod
    env:
    - name: MYSQL_ROOT_PASSWORD
      valueFrom:
        secretKeyRef:
          name: dbpassword
          key: pwd

Apply the changes:

k  apply -f 3.yaml