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Image pull error

As explained in Kubernetes for Developers

An image pull error is a Kubernetes failure state in which a cluster cannot download the container image required by a workload.

An image pull error occurs when Kubernetes cannot download the container image required by a Pod. The usual causes are a misspelled image name, a missing repository image, or missing registry credentials. section 3.2.3

Check these causes first:

  • Verify the image name and tag in the Deployment configuration. section 3.2.3
  • Confirm that the image exists in the container repository. section 3.2.3
  • Check that the cluster has credentials for a private repository. section 3.2.3
  • Apply configuration corrections with kubectl apply -f deploy.yaml. section 3.2.3
Listing 3.1 Chapter03/3.2_DeployingToKubernetes/deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: timeserver
spec:
  replicas: 3                                    #1
  selector:
    matchLabels:
      pod: timeserver-pod
  template:
    metadata:
      labels:
        pod: timeserver-pod
    spec:
      containers:
      - name: timeserver-container
        image: docker.io/wdenniss/timeserver:1   #2

Use the Deployment manifest to inspect the image name and tag Kubernetes will pull. section 3.2.3

How Kubernetes for Developers covers it

How deep it goes
Explains the failure and three common causes, then gives configuration and repository checks without covering deeper registry internals.
Examples
Uses a deploy.yaml manifest containing a versioned container image and recommends trying a public image as a quick fix.
What it assumes
Assumes basic Kubernetes Deployment configuration and container image terminology.
What you can do after
Diagnose image download failures and update a Deployment with kubectl.
How it connects
Connects Kubernetes Pods and Deployments with container images, container registries, credentials, and kubectl.
Cover of Kubernetes for Developers
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