Cilium Cilium Hubble UI not accessible

What is Cilium Cilium Hubble UI not accessible

Understanding Cilium and Hubble

Cilium is an open-source software for providing, securing, and observing network connectivity between container workloads. It leverages eBPF technology in the Linux kernel to provide high-performance networking, security, and observability. Hubble is a fully distributed networking and security observability platform for cloud-native workloads, built on top of Cilium.

Identifying the Symptom

One common issue users encounter is that the Cilium Hubble UI is not accessible. This means that when trying to access the Hubble UI, the page does not load, or an error message is displayed indicating that the service is unreachable.

Common Error Messages

"Unable to connect to Hubble UI" "Service Unavailable" "Connection Refused"

Exploring the Issue

The inaccessibility of the Hubble UI can be attributed to network issues or misconfiguration in the Hubble setup. This could be due to incorrect service exposure, firewall rules blocking access, or misconfigured Hubble components.

Network Issues

Network issues can arise if the Hubble UI service is not correctly exposed or if there are firewall rules preventing access. It's crucial to ensure that the service is reachable from the network you are trying to access it from.

Hubble Misconfiguration

Misconfiguration can occur if the Hubble components are not correctly set up, such as incorrect service ports or missing configurations in the Hubble deployment.

Steps to Resolve the Issue

Follow these steps to diagnose and resolve the issue of the Hubble UI not being accessible:

Step 1: Verify Network Connectivity

Ensure that the network connectivity to the Hubble UI service is intact. You can use the following command to check if the service is reachable:

kubectl get svc -n kube-system

Check if the Hubble UI service is listed and note the external IP or port.

Step 2: Check Hubble Configuration

Verify that the Hubble components are correctly configured. Check the Hubble configuration by inspecting the Hubble pod logs:

kubectl logs -n kube-system -l k8s-app=hubble-ui

Look for any error messages or warnings that might indicate configuration issues.

Step 3: Review Firewall Rules

Ensure that there are no firewall rules blocking access to the Hubble UI service. You may need to adjust your firewall settings to allow traffic on the necessary ports.

Step 4: Restart Hubble Components

If the above steps do not resolve the issue, try restarting the Hubble components:

kubectl rollout restart deployment/hubble-ui -n kube-system

This command will restart the Hubble UI deployment, which can resolve transient issues.

Further Resources

For more detailed information on configuring and troubleshooting Cilium and Hubble, refer to the following resources:

Cilium Hubble Documentation Hubble GitHub Repository