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kubectl delete

Learn to delete resources with kubectl delete.

kubectl delete

kubectl delete deletes objects by name, file or label:

kubectl delete pod web-7c5b9f6d8-abcde
kubectl delete -f web.yaml           # all objects in the file
kubectl delete deploy,svc -l app=web # those matching the label

Deleting a pod belonging to a deployment isn't permanent; the deployment creates a new one. To really remove the application, the deployment itself is deleted.

Graceful termination

A deleted pod is first sent SIGTERM and Kubernetes waits terminationGracePeriodSeconds (default 30 s). To remove a stuck pod immediately there is force deletion; but it doesn't guarantee the container really stopped, so it's used as a last resort:

kubectl delete pod web-abc --grace-period=60
kubectl delete pod web-abc --grace-period=0 --force   # last resort
kubectl delete pods --all                             # all pods in the namespace

Practice Cleanup

Write three commands: delete the objects in web.yaml; delete the deployments and services labelled app=api; delete the pod named eski-pod with a 5-second grace period.

Starter code

terminal
# buraya yaz

Sample solution

terminal
kubectl delete -f web.yaml
kubectl delete deploy,svc -l app=api
kubectl delete pod eski-pod --grace-period=5

Expected output

deployment.apps "web" deleted
deployment.apps "api" deleted
service "api" deleted
pod "eski-pod" deleted

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What happens if you delete a deployment's pod?

  • The deployment is deleted too
  • It errors
  • The deployment creates a new one in its place Correct answer
  • The application is removed completely

Explanation: The ReplicaSet keeps the desired replica count.

2 Delete the objects matching the label.

Question 
kubectl delete deploy,svc ____ app=web
Answer 
kubectl delete deploy,svc -l app=web

Explanation: -l (selector) selects by label.

3 Match.

Term Meaning
delete -f Delete what's in the file
delete -l Delete by label
--grace-period Termination time
--force Forced, last resort

All lessons in Intermediate

1 What is Kubernetes?

  1. What is Kubernetes?
  2. Why Kubernetes?
  3. Cluster architecture
  4. Control plane
  5. Worker node
  6. Summary - What is Kubernetes

2 Minikube

  1. What is Minikube?
  2. Installing Minikube
  3. minikube start
  4. minikube status
  5. minikube dashboard
  6. Summary - Minikube

3 kubectl basics

  1. What is kubectl?
  2. kubectl get
  3. kubectl describe
  4. kubectl apply
  5. kubectl delete
  6. Summary - kubectl

4 Pod

  1. What is a Pod?
  2. Pod YAML
  3. Creating a Pod
  4. Pod status
  5. Multi-container Pod
  6. Summary - Pod

5 Deployment

  1. What is a Deployment?
  2. Deployment YAML
  3. Replica count
  4. Rolling update
  5. Rollback
  6. Summary - Deployment

6 ReplicaSet

  1. What is a ReplicaSet?
  2. ReplicaSet YAML
  3. ReplicaSet selector
  4. Scaling
  5. Self-healing
  6. Summary - ReplicaSet

7 Service

  1. What is a Service?
  2. ClusterIP
  3. NodePort
  4. LoadBalancer
  5. Service selector
  6. Summary - Service

8 ConfigMap

  1. What is a ConfigMap?
  2. ConfigMap YAML
  3. Environment variable
  4. Mounting as a volume
  5. kubectl create configmap
  6. Summary - ConfigMap

9 Secret

  1. What is a Secret?
  2. Secret types
  3. Secret YAML
  4. Mounting a Secret
  5. kubectl create secret
  6. Summary - Secret

10 Namespace

  1. What is a Namespace?
  2. kubectl get namespaces
  3. Creating a Namespace
  4. The -n flag
  5. Default Namespace
  6. Summary - Namespace

11 Labels and selectors

  1. What is a label?
  2. Adding labels
  3. Label selector
  4. kubectl get -l
  5. Equality and set selectors
  6. Summary - Labels

12 Project: Multi-tier app

  1. Project design
  2. Database Deployment
  3. Web Deployment
  4. ConfigMap and Secret
  5. Putting it together - multi-tier

13 Troubleshooting

  1. kubectl logs
  2. kubectl exec
  3. kubectl describe pod
  4. CrashLoopBackOff
  5. Pending Pod
  6. Summary - Troubleshooting

14 Intermediate final

  1. Challenge - Pod YAML
  2. Challenge - Deployment
  3. Challenge - Service
  4. Challenge - ConfigMap
  5. Challenge - Intermediate project