Kubernetes: dump all keys in secret to files:

secretdump.sh

# Requirements: kubectl and yq
# This will take every key/value in a secret, base64 decode the value, and dump the result to
# a file named as the key name

# It's like doing the inverse process of creating a secret from file like this:
#
# kubectl create secret generic db-user-pass \
#     --from-file=./username.txt \
#     --from-file=./password.txt

# If you use JQ ( https://jqlang.github.io/jq/ )
SECRET=credentials-staging NAMESPACE=staging
for i in `kubectl -n ${NAMESPACE} get secret ${SECRET} -o json | jq -r '.data | keys | .[]'`
do
  echo "Dumping ${i}"
  kubectl -n ${NAMESPACE} get secret ${SECRET} -o json| jq -r '.data."'${i}'"' | base64 -d > ${i}
done

# If you use Mike Farah's yq ( https://github.com/mikefarah/yq )
SECRET=credentials-staging NAMESPACE=staging
for i in `kubectl -n ${NAMESPACE} get secret ${SECRET} -o yaml | yq '.data | keys | .[]'`
do
  echo "Dumping ${i}"
  kubectl -n ${NAMESPACE} get secret ${SECRET} -o yaml| yq -r '.data."'${i}'"' | base64 -d > ${i}
done

# If you use Andrey Kislyuk's yq ( https://github.com/kislyuk/yq )
SECRET=credentials-staging NAMESPACE=staging
for i in `kubectl -n ${NAMESPACE} get secret ${SECRET} -o yaml | yq -r '.data | keys[]'`
do
  echo "Dumping ${i}"
  kubectl -n ${NAMESPACE} get secret ${SECRET} -o yaml | yq -r '.data."'${i}'"' | base64 -d > ${i}
done

Unfortunately I receive the following error when trying this:
Error from server (BadRequest): the export parameter, deprecated since v1.14, is no longer supported

Hi @milosonator . Fortunately I was doing something like this just 5 minutes ago. I'm having lunch, but in an hour or so I'll update it :)

@milosonator , from what I've seen, removing the --export parameter is enough for it to work. Also, I've added another version just in case you use Mike Farah's yq, as that's the version I use currently.

@andor-pierdelacabeza thank you for that. Indeed I am using Mike Farah's yq (didn't realize there are more). And the command also works without the --export. Tried the updated script and does the trick. Cheers!

Looks like it will be shorter..

kubectl get secrets --namespace <namespace> -o json

@iamjenechka Hi Jenechka! I think you might have confused the functionality of the script.

What it does is:

• Takes a secret
• Creates a file for each of its keys, using the key as file name
• Puts the value of each key, base64 decoded, inside the file

So, for example, if you have the typical tls secret that looks a bit like this:

apiVersion: v1
kind: Secret
metadata:
  name: secret-tls
type: kubernetes.io/tls
data:
  tls.crt: |
    [BASE64DATA]
  tls.key: |
    [BASE64DATA]    

...running the previous script would give you two files (tls.crt and tls.key) with the content decoded from base64.

It's like doing the inverse process of creating a secret from file like this:

kubectl create secret generic db-user-pass \
    --from-file=./username.txt \
    --from-file=./password.txt