helm values from kubernetes secrets?

4
votes

I am using this chart : https://github.com/helm/charts/tree/master/stable/prometheus-mongodb-exporter

This chart requires MONGODB_URI environment variable or mongodb.uri populated in values.yaml file, Since this is a connection string I don't want to check-in that into git. I was thinking of kubernetes secrets and provide the connection string from kubernetes secrets. I have not been able to successfully find a solution for this one.

I also tried creating another helm chart and using this one as a dependency for that chart and provide value for MONGODB_URI from secrets.yaml but that also didn't work because in prometheus-mongodb-exporter chart MONGODB_URI is defined as a required value which is then passed into secrets.yaml file within that chart, so dependency chart never gets installed because of that.

What would be the best way of achieving this?

1
kubernetesprometheuskubernetes-helmprometheus-operator

1 Answers

2
votes

Solution 1: Create custom chart

  1. Delete the secret.yaml from chart's template directory.
  2. Create the k8s secret on your own, maybe named cumstom-secret
  3. Edit the deployment.yaml: here
       - name: MONGODB_URI
         valueFrom:
           secretKeyRef:
             name: custom-secret ## {{ include "prometheus-mongodb-exporter.fullname" . }}##
             key: mongodb-uri

Solution 2: Use original chart

  1. Set a dummy value for mongodb.uri in value.yaml.
  2. Use --set flag to overwrite the dummy value with original while installing the chart. So, your git won't have the history.
$ helm install prometheus-mongodb-exporter stable/prometheus-mongodb-exporter --set mongodb.uri=******