dump-secrets-kubernetes.sh

kubectl get — no-headers secret | awk '{print $1}' | \
  xargs -I{} sh -c 'kubectl get secret -o yaml "$1" > "$1.yaml"' — {}

If this command does not work, you might try this version:

kubectl get secret -A -o custom-columns=:.metadata.name,:.metadata.namespace --no-headers | 
xargs  -n 2 sh -c '(kubectl get secret -n $3 -o yaml $2; echo "---") >> $2.yaml' -- {}

It:

• doesn't use left/right quotation marks
• doesn't rely on the order of columns returned by kubectl get
• get secrets in all namespaces
• aggregate secrets with same name but from different namespaces as separate documents in same file (use '---')

cons:

• it always append to files so you need to manually delete them if you are calling it again

thanks for this time saving one liner