---
title: Use Cascading Deletion in a Cluster
content_type: task
weight: 360
---

<!--overview-->

This page shows you how to specify the type of
[cascading deletion](/docs/concepts/architecture/garbage-collection/#cascading-deletion)
to use in your cluster during {{<glossary_tooltip text="garbage collection" term_id="garbage-collection">}}.

## {{% heading "prerequisites" %}}

{{< include "task-tutorial-prereqs.md" >}}

You also need to [create a sample Deployment](/docs/tasks/run-application/run-stateless-application-deployment/#creating-and-exploring-an-nginx-deployment) 
to experiment with the different types of cascading deletion. You will need to
recreate the Deployment for each type.

## Check owner references on your pods

Check that the `ownerReferences` field is present on your pods:

```shell 
kubectl get pods -l app=nginx --output=yaml
```

The output has an `ownerReferences` field similar to this:

```yaml
apiVersion: v1
    ...
    ownerReferences:
    - apiVersion: apps/v1
      blockOwnerDeletion: true
      controller: true
      kind: ReplicaSet
      name: nginx-deployment-6b474476c4
      uid: 4fdcd81c-bd5d-41f7-97af-3a3b759af9a7
    ...
```

## Use foreground cascading deletion {#use-foreground-cascading-deletion}

By default, Kubernetes uses [background cascading deletion](/docs/concepts/architecture/garbage-collection/#background-deletion)
to delete dependents of an object. You can switch to foreground cascading deletion
using either `kubectl` or the Kubernetes API, depending on the Kubernetes
version your cluster runs. {{<version-check>}}


You can delete objects using foreground cascading deletion using `kubectl` or the
Kubernetes API.

**Using kubectl**

Run the following command:
<!--TODO: verify release after which the --cascade flag is switched to a string in https://github.com/kubernetes/kubectl/commit/fd930e3995957b0093ecc4b9fd8b0525d94d3b4e-->

```shell
kubectl delete deployment nginx-deployment --cascade=foreground
```

**Using the Kubernetes API**

1. Start a local proxy session:

   ```shell
   kubectl proxy --port=8080
   ```

1. Use `curl` to trigger deletion:

   ```shell
   curl -X DELETE localhost:8080/apis/apps/v1/namespaces/default/deployments/nginx-deployment \
       -d '{"kind":"DeleteOptions","apiVersion":"v1","propagationPolicy":"Foreground"}' \
       -H "Content-Type: application/json"
   ```

   The output contains a `foregroundDeletion` {{<glossary_tooltip text="finalizer" term_id="finalizer">}}
   like this:

   ```
   "kind": "Deployment",
   "apiVersion": "apps/v1",
   "metadata": {
       "name": "nginx-deployment",
       "namespace": "default",
       "uid": "d1ce1b02-cae8-4288-8a53-30e84d8fa505",
       "resourceVersion": "1363097",
       "creationTimestamp": "2021-07-08T20:24:37Z",
       "deletionTimestamp": "2021-07-08T20:27:39Z",
       "finalizers": [
         "foregroundDeletion"
       ]
       ...
   ```


## Use background cascading deletion {#use-background-cascading-deletion}

1. [Create a sample Deployment](/docs/tasks/run-application/run-stateless-application-deployment/#creating-and-exploring-an-nginx-deployment).