K3s is a lightweight Kubernetes distribution designed for resource-constrained environments and edge computing. It simplifies the deployment and management of Kubernetes clusters by reducing the overhead and complexity associated with traditional Kubernetes setups. K3s is ideal for IoT devices, development environments, and small-scale production deployments.
One common issue encountered in K3s is the 'PodFailedToPullImage' error. This error occurs when a pod fails to pull the specified container image from a container registry. The symptom is typically observed in the pod's status, where it remains in a 'Pending' state with an error message indicating the failure to pull the image.
The error message might look like this:
Failed to pull image "myregistry/myimage:latest": rpc error: code = Unknown desc = Error response from daemon: pull access denied for myregistry/myimage, repository does not exist or may require 'docker login'
The 'PodFailedToPullImage' error can arise due to several reasons:
Ensure that the image name and tag are correct. Verify this by checking the image repository for the exact name and tag.
Follow these steps to resolve the 'PodFailedToPullImage' issue:
Check the pod's YAML configuration to ensure the image name and tag are correct. You can use the following command to view the pod's configuration:
kubectl get pod -o yaml
Ensure the image name and tag match those available in your container registry.
If the registry requires authentication, ensure that the necessary credentials are provided. You can create a Kubernetes secret to store the Docker registry credentials:
kubectl create secret docker-registry myregistrykey \
--docker-server=myregistry.example.com \
--docker-username=myusername \
--docker-password=mypassword \
--docker-email=myemail@example.com
Then, reference this secret in your pod's configuration under the imagePullSecrets section.
Ensure that your K3s nodes have network access to the container registry. You can test connectivity using tools like curl or ping from within the node:
curl -v https://myregistry.example.com/v2/
For more information on troubleshooting image pull issues, refer to the official Kubernetes documentation on container images. Additionally, the K3s documentation provides insights into managing K3s clusters effectively.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)
