Docker image to detect outdated Helm charts

This docker image uses https://github.com/fabmation-gmbh/helm-whatup to check whether there are outdated Helm charts installed in your cluster. Helm 3 only.

It is installed as a Kubernetes cron job
- needs a service account with sufficient privileges (read-only permissions)
Supports two usage modes: either
- the job fails if a chart is outdated (which integrates into your existing monitoring), or
- it mails you a list of outdated charts (if recipient and SMTP configured)
Supports to send mails only on changes (if /data is a persistent volume)

Repository address

DockerHub image (built using GitHub action): aspettl/docker-helm-outdated

See the example resource definitions in the deploy folder. This example includes

a cron job that executes once a night
a service account with (cluster-wide) read-only permissions, needed to detect all Helm charts
a config map with a custom add_repos.sh script to add the Helm repositories
a secret with SMTP credentials for sending mails
a persistent volume claim, needed to send emails only on changes

Use kubectl create job --namespace=helm-outdated --from=cronjob/helm-outdated helm-outdated-test to schedule a job immediately.

MIT license, see LICENSE