Kube-probe HTTP probe failed with status code 302

The application is redirecting the probe request temporarily.

Understanding Kube-probe

Kube-probe is an essential component of Kubernetes, responsible for checking the health of containers running within a pod. It helps ensure that applications are running smoothly by performing periodic checks and taking corrective actions if necessary. Kube-probe supports three types of probes: HTTP, TCP, and command-based (exec) probes.

Identifying the Symptom

When using Kube-probe, you might encounter an error message stating: HTTP probe failed with status code 302. This indicates that the HTTP probe sent to the application received a 302 status code in response, which is a temporary redirect.

Exploring the Issue

The HTTP status code 302 is a common response indicating that the resource requested has been temporarily moved to a different URL. In the context of Kube-probe, this means that the probe request is being redirected, which is not handled by default. This can occur if the application is configured to redirect requests for authentication or other purposes.

Why Redirects Occur

Redirects can occur due to several reasons, such as:

Application-level redirects for load balancing or maintenance.
Security configurations requiring HTTPS, redirecting HTTP requests to HTTPS.
URL restructuring or changes in the application.

Steps to Resolve the Issue

To resolve the issue of HTTP probe failures due to a 302 status code, follow these steps:

Step 1: Verify the Application's Redirect Behavior

Check the application's configuration to understand why the redirect is occurring. You can use tools like curl to manually test the endpoint:

curl -I http://your-application-url

This command will show you the HTTP headers, including any Location headers indicating a redirect.

Step 2: Update the Probe Configuration

Modify the Kubernetes probe configuration to handle the redirect or point to the correct URL. If the redirect is intentional and necessary, consider updating the probe to follow redirects:

livenessProbe: httpGet: path: /new-path port: 80 initialDelaySeconds: 3 periodSeconds: 3

Ensure the path is updated to the correct endpoint that does not redirect.

Step 3: Consider Using HTTPS

If the redirect is due to HTTP to HTTPS redirection, update the probe to use HTTPS:

livenessProbe: httpGet: scheme: HTTPS path: / port: 443 initialDelaySeconds: 3 periodSeconds: 3

Additional Resources

For more detailed information on configuring probes in Kubernetes, refer to the official Kubernetes documentation. Understanding how to configure and troubleshoot probes can significantly enhance the reliability of your applications.

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MORE ISSUES

Kube-probe Probe failed: invalid probe configuration

The probe configuration contains invalid parameters or syntax errors.

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The port specified for the TCP probe is already in use by another process.

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The application is misconfigured and cannot become ready.

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The application does not allow the HTTP method used by the probe.

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There is a protocol mismatch between the probe and the application.

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The SSL certificate used by the application is invalid or expired.

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The application failed to initialize properly.

Kube-probe Probe failed: invalid response code

The application returned an unexpected HTTP status code.

Kube-probe HTTP probe failed with status code 302

The application is redirecting the probe request temporarily.

Kube-probe Exec probe failed: environment variable missing

The command executed by the exec probe relies on an environment variable that is not set.

Kube-probe HTTP probe failed with status code 400

The application received a bad request from the probe.

Kube-probe TCP probe failed: host unreachable

The probe cannot reach the host due to network issues.

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The probe is sending headers in an incorrect format.

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The HTTP probe is trying to access a path that does not exist on the application.

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The probe is attempting to use a protocol not supported by the application.

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The URL specified in the probe configuration is not correctly formatted.

Kube-probe HTTP probe failed with status code 301

The application is redirecting the probe request to a different URL.

Kube-probe Readiness probe failed: dependency service down

A dependent service required by the application is not available.

Kube-probe Exec probe failed: exit code non-zero

The command executed by the exec probe returned a non-zero exit code, indicating failure.

Kube-probe TCP probe failed: connection timed out

The probe is unable to establish a connection to the application within the timeout period.

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The probe is using an HTTP method that the application does not support.

Kube-probe HTTP probe failed with status code 503

The application is temporarily unavailable, possibly due to overload or maintenance.

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There is an issue with the SSL/TLS configuration between the probe and the application.

Kube-probe Liveness probe failed: application crash

The application has crashed and is unable to respond to the liveness probe.

Kube-probe Readiness probe failed: resource limit exceeded

The application is unable to allocate necessary resources to handle the probe request.

Kube-probe TCP probe failed: network unreachable

The network is not properly configured, preventing the probe from reaching the application.

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The application returned a response in an unexpected format that the probe cannot interpret.

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The command specified in the exec probe lacks the necessary permissions to execute.

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The application is acting as a gateway or proxy and received an invalid response from the upstream server.

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The application is denying access to the probe due to insufficient permissions.

Kube-probe HTTP probe failed with status code 401

The probe is not authenticated to access the endpoint.

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The application is not ready to serve traffic.

Kube-probe Liveness probe failed: container not running

The container has crashed or is not running.

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The probe is unable to resolve the DNS name of the application.

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Network connectivity issues between the probe and the application.

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The command specified in the exec probe is not available in the container's environment.

Kube-probe Liveness probe failed: HTTP 500

The application is returning an internal server error for the liveness probe request.

Kube-probe TCP probe failed: connection refused

The application is not listening on the specified port, or the service is not running.

Kube-probe Readiness probe failed: timeout

The application is taking too long to respond to the readiness probe.

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