I inherited a Kubernetes/Docker setup, and I accidentally crashed the pod by changing something relating to the DB password.
I am trying to troubleshoot this.
I don't have much Kubernetes or Docker experience, so I'm still learning how to do things.
The value is contained inside the db-user-pass credential I believe, which is an Opaque type secret.
I'm describing it:
kubectl describe secrets/db-user-pass
Name: db-user-pass
Namespace: default
Labels: <none>
Annotations: <none>
Type: Opaque
Data
====
password: 16 bytes
username: 13 bytesbut I have no clue how to get any data from this secret. The example on the Kubernetes site seems to assume I'll have a base64 encoded string, but I can't even seem to get that. How do I get the value for this?
416 Answers
You can use kubectl get secrets/db-user-pass -o yaml or -o json where you'll see the base64-encoded username and password. You can then copy the value and decode it with something like echo <ENCODED_VALUE> | base64 -D (Mac OS X).
A more compact one-liner for this:
kubectl get secrets/db-user-pass --template={{.data.password}} | base64 -Dand likewise for the username:
kubectl get secrets/db-user-pass --template={{.data.username}} | base64 -DNote: on GNU/Linux, the base64 flag is -d, not -D.
I would suggest using this handy command. It utilizes a power of go-templates. It iterates over all values, decodes them, and prints them along with the key. It also handles not set values.
kubectl get secret name-of-secret -o go-template='
{{range $k,$v := .data}}{{printf "%s: " $k}}{{if not $v}}{{$v}}{{else}}{{$v | base64decode}}{{end}}{{"\n"}}{{end}}'
## In your case it would output
# password: decoded_password
# username: decoded_usernameIf you don't like go-templates you can use different output formats e.g. yaml or json, but that will output secrets encoded by base64.
If you have jq (json query) this works:
kubectl get secret db-user-pass -o json | jq '.data | map_values(@base64d)'NOTE:
db-user-passis the name of the k8s secret.datais the variable within that contains the secret value
If your secret keys contain dash (-) or dot (.):
kubectl get secret db-user-pass -o=go-template='{{index .data "password"}}' | base64 -dThis should work on all platforms, with kubectl 1.11+
kubectl get secrets/db-user-pass --template='{{.data.password | base64decode}}'And if you want to get all keys, values
kubectl get secrets/db-user-pass --template='{{ range $key, $value := .data }}{{ printf "%s: %s\n" $key ($value | base64decode) }}{{ end }}'First, get the secret from the etcd by querying the api server using kubectl.
kubectl get secret db-user-pass -o yaml This will give you the base64 encoded secret in yaml format.
Once you have the yaml file decode them using
"base64 --decode"
Final command will look like this:
Don't forget the -n flag in echo command
echo -n "jdddjdkkdkdmdl" | base64 --decode
This is the link you might be looking for.
Kubernetes secrets need the secrets to be given in base64 encoded format, which can be created using base64 binary in case of linux distributions.
Example:
echo "hello" | base64
aGVsbG8KKubernetes decodes the base64 encoding when we pass the secret key as environment variable or mounted as volume.
2This jsonpath variation works for me on OSX.
kubectl get secrets/db-user-pass -o jsonpath="{.data.username}" | base64 -dTo get secret with dot in the name.
kubectl get secrets/tls -o jsonpath="{.data['tls\.crt']}" | base64 -dFor easier decoding you can use a tool like ksd that will do the base64 decoding for you
kubectl get secrets/db-user-pass -o yaml | ksdor using
kubectl view-secret secrets/db-user-passon ubuntu 18+
kubectl get secrets/db-user-pass --template={{.data.password}} | base64 -dKubernetes 1.11+
kubectl get secrets/db-user-pass --template='{{.data.password | base64decode }}'This one liner is used to get an encoded kubeconfig file from a secret, and generate a file from it to be used dynamically on a ci job for example:
kubectl get secret YOUR_SECRET -o json | grep -oP '(?<=\"YOUR_SECRET_KEY\": \")[^\"]*' | base64 --decode > ./YOUR_KUBECONFIG_FILE_NAMEExtending @Břetislav Hájek solution (thank you very much for that).
If you need to get it by a label, then you'll need to add an extra range command to iterate over the returned items.
$ LABEL_FILTER=""
$ kubectl get secret -l "$LABEL_FILTER" -o go-template='
{{range $i := .items}}{{range $k,$v := $i.data}}{{printf "%s: " $k}}{{if not $v}}{{$v}}{{else}}{{$v | base64decode}}{{end}}{{"\n"}}{{end}}{{end}}'
mysql_password: ...
mysql_root_password: ...
mysql_user: ...With bash. This is running ubuntu 18.04, and Kubernetes 1.18.5
kubectl -n metallb-system get secrets memberlist -o json | grep secretkey | grep -v f:s | awk -F '"' '{print$4}' |base64 --decode; echoMinimal nodejs CLI tool (github)
npm i -g kusd
kubectl get secret your-secret -o yaml | kusdThis would help if you have yaml file for k8s secrets. You can use this intellij plugin to decode all base64 encoded values in a yaml file.
