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Clusters Garbage Collector

Overview

This command finds and removes orphaned clusters created by the kyma-gke-integration job in a Google Cloud Platform (GCP) project.

The kyma-gke-integration job creates a GKE cluster to install and test Kyma. Usually, the job also cleans up the cluster. It can happen, however, that the job is terminated before its clean-up finishes. This causes a resource leak that generates unwanted costs. The garbage collector finds and removes such clusters based on two different strategies, specified by the caller.

In the default filter strategy, there are three conditions used to find clusters for removal:

  • The cluster name pattern that is specific for the kyma-gke-integration job
  • The value of a volatile label the cluster is annotated with
  • The cluster createTime value that is used to find clusters existing at least for a preconfigured number of hours

In the time filter strategy, there are three conditions used to find clusters for removal:

  • The label value of volatile that the cluster is annotated with
  • The label value of created-at, which holds the unix timestamp of when the cluster was created
  • The label value of ttl, which specifies the clusters maximum intended runtime in hours

Clusters that meet these conditions in the specified strategy are subject to removal.

Usage

For safety reasons, the dry-run mode is the default one. To run it, use:

env GOOGLE_APPLICATION_CREDENTIALS={path to service account file} go run main.go \
    --project={gcloud project name}

To turn the dry-run mode off, use:

env GOOGLE_APPLICATION_CREDENTIALS={path to service account file} go run main.go \
    --project={gcloud project name} \
    --dryRun=false

Flags

See the list of available flags:

Name Required Description
--project Yes GCP project name
--dryRun No The boolean value that controls the dry-run mode. It defaults to true.
--strategy No The cluster filter strategy. Defaults to default, can be switched to time.
--ageInHours No The integer value for the number of hours. It only matches clusters older than now()-ageInHours. It defaults to 3. [Only honored in default strategy]
--clusterNameRegexp No The string value with a valid Golang regexp. It is used to match clusters by their name. It defaults to `^gkeint[-](pr
--excluded-clusters No The list of clusters that cannot be removed by the cluster collector.

Environment variables

See the list of available environment variables:

Name Required Description
GOOGLE_APPLICATION_CREDENTIALS Yes The path to the service account file. The service account requires at least container.clusters.list and container.clusters.delete Google IAM permissions.