How to identify what creates a Kubernetes resource?
I am debugging what creates the following resources:
$ kubectl get deploy -o=name | grep datadog
deployment.apps/datadog-cluster-agent
deployment.apps/datadog-kube-state-metrics
Every time I delete them, within seconds they are created again.
Just by looking at the labels, I can tell that it is managed by Helm:
$ kubectl describe deploy/datadog-cluster-agent
Name: datadog-cluster-agent
Namespace: default
CreationTimestamp: Tue, 26 Jan 2021 18:56:51 -0800
Labels: app.kubernetes.io/instance=datadog
app.kubernetes.io/managed-by=Helm
app.kubernetes.io/name=datadog
app.kubernetes.io/version=7
contra.com/app-name=datadog
helm.sh/chart=datadog-2.7.0
However, I am pretty confident that Helm is not even installed on the cluster:
$ kubectl get all -A | grep helm
$ kubectl get all -A | grep tiller
How do I identify what is creating this datadog deployment
every time I delete it?
Further debugging information:
Attempting to list all related resources gives:
$ kubectl get all -l app.kubernetes.io/instance=datadog
NAME READY STATUS RESTARTS AGE
pod/datadog-kube-state-metrics-55d9f8659f-5tqsl 1/1 Running 0 4m43s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/datadog-cluster-agent ClusterIP 10.0.14.155 <none> 5005/TCP 6h16m
service/datadog-kube-state-metrics ClusterIP 10.0.2.87 <none> 8080/TCP 20d
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/datadog 5 5 4 1 4 kubernetes.io/os=linux 3m45s
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/datadog-cluster-agent 1/1 1 1 4m37s
deployment.apps/datadog-kube-state-metrics 1/1 1 1 4m43s
NAME DESIRED CURRENT READY AGE
replicaset.apps/datadog-kube-state-metrics-55d9f8659f 1 1 1 4m43s
If I delete all resources using kubectl delete all -l app.kubernetes.io/instance=datadog
, they are recreated within seconds again.
Solution 1:
You should check that Deployment JSON or YAML definition. In the metadata, there should be an ownerReference, such as:
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "1"
creationTimestamp: "2021-01-12T08:34:06Z"
generation: 1
name: eventlistener
namespace: ci
ownerReferences:
- apiVersion: triggers.tekton.dev/v1alpha1
blockOwnerDeletion: true
controller: true
kind: EventListener
name: github-listener
uid: 54a7115e-565d-4239-b8fc-66e94c6c221b
spec:
...
When an object is created by another, you should find that ownerReference, telling you who's to blame.