Pod deletion in k8s

https://stackoverflow.com/questions/53405701/can-not-delete-pods-in-kubernetes

for the reason.

Kubernetes has some workloads (those contain PodTemplate in their manifest). These are:

Pods
Controllers (basically Pod controllers)
ReplicationController
ReplicaSet
Deployment
StatefulSet
DaemonSet
Job
CronJob
See, who controls whom:

ReplicationController -> Pod(s)
ReplicaSet -> Pod(s)
Deployment -> ReplicaSet(s) -> Pod(s)
StatefulSet -> Pod(s)
DaemonSet -> Pod(s)
Job -> Pod
CronJob -> Job(s) -> Pod
a -> b means a creates and controls b and the value of field .metadata.ownerReference in b's manifest is the reference of a. For example,

apiVersion: v1
kind: Pod
metadata:
  ...
  ownerReferences:
  - apiVersion: apps/v1
    controller: true
    blockOwnerDeletion: true
    kind: ReplicaSet
    name: my-repset
    uid: d9607e19-f88f-11e6-a518-42010a800195
  ...
This way, deletion of the parent object will also delete the child object via garbase collection.

So, a's controller ensures that a's current status matches with a's spec. Say, if one deletes b, then b will be deleted. But a is still alive and a's controller sees that there is a difference between a's current status and a's spec. So a's controller recreates a new b obj to match with the a's spec.

The ops created a Deployment that created ReplicaSet that further created Pod(s). So here the soln was to delete the root obj which was the Deployment.

$ kubectl get deploy -n {namespace}

$ kubectl delete deploy {deployment