TechOps Examples
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Use Case
Kubernetes ImagePullBackOff Explained
For Kubernetes practitioners, encountering the ImagePullBackOff error is a common challenge that is inevitable.
The Kubernetes ImagePullBackOff error happens when the system fails to retrieve the required container image. When this occurs, the container remains in a Waiting state, unable to proceed with deployment.
Ref: groundcover
What exactly happens during an ImagePullBackOff?
Kubernetes requests the node to pull the image.
Node sends a request to Docker Daemon to pull the image.
Docker Daemon requests the image from the registry.
If the image is found, the registry sends the image back to Docker Daemon.
Docker Daemon pulls the image to the node.
If the image is successfully pulled, Kubernetes marks the image as ready.
If the image is not found, Docker Daemon reports the failure.
Kubernetes retries pulling the image.
If the retry fails, Kubernetes enters ImagePullBackOff state, preventing further retries.
credit: perfectscale
How to detect ImagePullBackOff?
1. View Pods Status
Check if the pod is experiencing issues by viewing its status.
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
api-pod 0/1 ErrImagePull 0 25s Wait a moment, then run the get pods command again: Confirm if the status has changed to ImagePullBackOff after a few seconds.
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
api-pod 0/1 ImagePullBackOff 0 1m5s 2. Inspect the Pod
Get detailed information on why the image pull is failing.
$ kubectl describe pod api-pod
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 50s default-scheduler Successfully assigned default/api-pod to minikube
Normal Pulling 25s (x2 over 45s) kubelet Pulling image "techopsexamples.com/api-service:v2.5"
Warning Failed 15s (x2 over 40s) kubelet Failed to pull image "techopsexamples.com/api-service:v2.5": Error response from daemon: pull access denied for example.com/api-service, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
Warning Failed 15s (x2 over 40s) kubelet Error: ErrImagePull
Normal BackOff 5s (x2 over 40s) kubelet Back-off pulling image "techopsexamples.com/api-service:v2.5"
Warning Failed 5s (x2 over 40s) kubelet Error: ImagePullBackOffFixing ImagePullBackOff
1. Fix Manifest or Image Name
Correct typos or incorrect image names in the pod manifest.
apiVersion: v1
kind: Pod
metadata:
name: api-pod
labels:
app: api
spec:
containers:
- name: api-container
image: techopsexamples.com/api-service:v2.5
ports:
- containerPort: 8080Apply this manifest again: Apply the corrected manifest to update the pod.
$ kubectl apply -f pod.yaml
pod/api-pod configuredCheck pod status: Verify that the pod is now running successfully.
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
api-pod 1/1 Running 0 1m 2. Non-existent Image Validation
Ensure the image is available in the registry before pulling.
$ docker push techopsexamples.com/api-service:v2.53. Image Registry Authorization
Create a secret with credentials to access the private registry.
$ kubectl create secret docker-registry reg-secret \
--docker-server=private-repo.com \
--docker-username=myuser \
--docker-password=mysecurepassword \
--docker-email=[email protected]Link the secret to the pod's manifest to allow access.
apiVersion: v1
kind: Pod
metadata:
name: private-api-pod
labels:
app: private-api
spec:
containers:
- name: private-api-container
image: private-repo.com/internal-app:v3.0
imagePullSecrets:
- name: reg-secretI believe this was helpful !
Next time when you encounter an ImagePullBackOff error, you'll know exactly how to diagnose and fix it efficiently.
Tool Of The Day
KUDO - A toolkit that makes it easy to build Kubernetes Operators, in most cases just using YAML.
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