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Problem-Pattern 'frequent-restarts'

ChartVersion

Overview

This chart will deploy ingress-nginx in the definedNamespace. The controller will be restarted by a CronJob.
By default the pkill will happen at 10:00, 10:01 & 10:02 UTC (0,1,2 10 * * *). This can be adjusted in the values.yaml file.
Each trigger of the CronJob results in a failed readiness probe. This failure causes the container to restart.

The CronJob and its required ServiceAccount will be deployed in the default "problem-patterns" Namespace (unless updated in the values.yaml).
All other components will adhere to the specified --namespace in the helm upgrade --install command.

Use-Case

In this demo we want to force a pod to be restarted a few times. This will increase the restart count on the pod as well as potentially raise an alert if the workload is monitored.
To fully utilize this demo you might want to adjust the schedule according to your needs.

$ kubectl get pod -l app.kubernetes.io/name=ingress-nginx -n frequent-restarts
NAME                                                          READY   STATUS    RESTARTS       AGE
frequent-restarts-ingress-nginx-controller-748ff659db-gmmhj   1/1     Running   3 (11h ago)   19h

Installation

After building the dependency for ingress-nginx simply run a helm upgrade command from the root of this repository:

helm dependency build ./frequent-restarts
helm upgrade --install --dependency-update frequent-restarts ./frequent-restarts --namespace frequent-restarts --create-namespace

Removal

Helm uninstall will get rid of everything but the namespaces. Thus we need to issue a kubectl delete manually to finish the cleanup.

Note

The faultInjection.namespace will be left regardless. It is used by many of our charts, so we will not delete it.
Please remove it manually when you are sure it's not needed anymore.

helm uninstall frequent-restarts --namespace frequent-restarts
kubectl delete namespace frequent-restarts

Dependency

We are using the ingress-nginx helm chart as a dependency for this deployment. No special configurations are in place or needed for this demo.
Please refer to the official documentation for configurations that you might need.