Kube-probe is a diagnostic tool used within Kubernetes to monitor the health of applications running in a cluster. It helps ensure that applications are running smoothly by checking their availability and responsiveness. Kube-probe can perform HTTP, TCP, and command-based checks to verify the status of an application.
One common symptom that developers encounter is the error message: HTTP probe failed with status code 404. This indicates that the HTTP probe attempted to access a specific path on the application, but the server returned a 404 Not Found status code.
A 404 status code is an HTTP response status code indicating that the server could not find the requested resource. This typically means that the URL path specified in the request does not exist on the server.
The error occurs when the HTTP probe is configured to check a path that is not available on the application. This could be due to a typo in the URL, a misconfiguration in the probe settings, or the endpoint not being implemented in the application.
To resolve the HTTP probe failed with status code 404 issue, follow these steps:
Check the probe configuration in your Kubernetes deployment YAML file. Ensure that the path specified in the httpGet
section matches a valid endpoint on your application. For example:
livenessProbe:
httpGet:
path: /healthz
port: 8080
Ensure that /healthz
is a valid endpoint.
Use a tool like curl to manually test the endpoint. Run the following command to check if the endpoint is accessible:
curl -I http://your-application-url:8080/healthz
If you receive a 404 status code, the endpoint may not exist or be incorrectly configured.
If the endpoint is missing, update your application code to include the necessary endpoint. Ensure that the application is serving the endpoint correctly.
After making changes to the probe configuration or application code, redeploy your application to apply the updates. Use the following command to apply changes:
kubectl apply -f your-deployment-file.yaml
By following these steps, you can resolve the HTTP probe failed with status code 404 issue in Kubernetes. Ensuring that your probe configurations are accurate and your application endpoints are correctly implemented will help maintain the health and availability of your applications. For more information, refer to the Kubernetes documentation on probes.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)