Troubleshoot Data Plane Nodes

Out of sync data plane node

Problem

Occasionally, a Kong Gateway data plane node might get out of sync with the Konnect control plane. If this happens, you will see the status Out of sync on the Data Plane Nodes page, meaning the control plane can’t communicate with the node.

Solution

Troubleshoot the issue using the following methods:

Ensure the data plane node is running. If it’s not running, start it; if it is running, restart it.

Check the sync status in the Gateway Manager.
Check the logs of the data plane node that’s appearing as Out of sync. The default directory for Kong Gateway logs is /usr/local/kong/logs.

If you find any of the following errors:
- Data plane node failed to connect to the control plane.
- Data plane node failed to ping the control plane.
- Data plane node failed to receive a ping response from the control plane.
You may have an issue on the host network where the node resides. Diagnose and resolve the issue, then restart the node and check the sync status in the Gateway Manager.
If the logs show a license issue, contact Kong Support.

If you are unable to resolve sync issues using the above methods, contact Kong Support.

Missing functionality

Problem

If a Konnect feature isn’t working on your data plane node, the version may be out of date.

Solution

Dedicated Cloud Gateway

Self-hosted

With Dedicated Cloud Gateways, Kong Gateway updates can be performed with the Konnect manager or API. Konnect will automatically provision new data plane nodes and slowly migrate traffic while monitoring for errors. For more information, read the Upgrade documentation.

Verify that your data plane node versions are up to date:

Open Gateway Manager, then open your control plane.
Select Data Plane Nodes from the side menu, then click the New Data Plane Node button.
Check the Kong Gateway version in the code block. This is the version that the Konnect control plane is running.
Return to the data plane nodes page.
Check the data plane node versions in the table. If you see a node running an older version of Kong Gateway, your data plane node may need upgrading.

If your version is up to date but the feature still isn’t working, contact Kong Support.

Kubernetes data plane node installation does not work

Problem

You followed the Kubernetes installation instructions in Gateway Manager but your data plane node isn’t connecting.

Solution

Check your deployment logs for the error:

kubectl logs deployment/my-kong-kong -n kong

If you find any errors and need to update values.yaml, make your changes, save the file, then reapply the configuration by running the Helm upgrade command:

helm upgrade my-kong kong/kong -n kong \
  --values ./values.yaml

Connect a data plane to Kong Konnect that is behind a non-transparent forward proxy.

In situations where forward proxies are non-transparent, you can still connect the Kong Gateway data plane with the Kong Konnect control plane. To do this, you need to configure each Kong Gateway data plane node to authenticate with the proxy server and allow traffic through. For more information, see Control Plane and Data Plane Communication through a Forward Proxy in the Kong Gateway documentation.