Kube Remediator

Remediators

• Reschedules Pods in CrashLoopBackOff
• Deletes unbound PVCs

CrashLoopBackOff Rescheduler

Reschedules CrashLoopBackOff Pod to fix permanent crashes caused by stale init-container/sidecar/configmap

• Listens to Pod update events
• Looks for containers in CrashLoopBackOff with restartCount > 5 (failureThreshold config)
• Ignores Pods with annotation kube-remediator/CrashLoopBackOffRemediator: "false"
• Can work in a single namespace, default is all namespaces "" (namespace config)
• Ignores Pods without ownerReferences (Avoid deleting something which does not come back)

Old Pod Deleter

Deletes Pods with label kube-remediator/OldPodDeleter=true older than 24h

Unbound PersistentVolumeClaim cleaner TODO

Deletes PersistentVolumeClaim left behind by deleted StatefulSet, that are not automatically cleanup up otherwise

• Waits for 7 days(configurable) before deleting
• Ignores if PersistentVolume has persistentVolumeReclaimPolicy set to Retain

Deploy

kubectl apply -f kubernetes/rbac.yaml
kubectl apply -f kubernetes/app-server.yml

Configuration options:

• Deploy provided image to use defaults under config/*
• Make a new image FROM the provided image and add/remove config/*
• Overwrite config/* with a mounted ConfigMap

Development

Running locally on currently selected kubernetes cluster with go ~> 1.12.9:

unset GOPATH
go mod vendor # install into local directory instead of global path
make dev # run on cluster from $KUBECONFIG (defaults to ~/.kube/config)

# test CrashLoopBackOffRemediator by seeing if this pod is rescheduled when it crashloops after it's restarted failureThreshold times
kubectl apply -f examples/crashloop_pod.yml

# test OldPodDeleter by seeing if this pod is deleted when it gets old
kubectl apply -f examples/old_pod.yml