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docs: explain how to change cluster measurements

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Co-authored-by: Thomas Tendyck <tt@edgeless.systems>
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Otto Bittner 2023-03-15 10:14:49 +01:00
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docs/docs/workflows/troubleshooting.md
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@ -106,3 +106,29 @@ Debugging via a shell on a node is [directly supported by Kubernetes](https://ku
```sh
kubectl delete pod node-debugger-constell-worker-xksa0-000000-bjthj
```
## Nodes fail to join with error `untrusted PCR value`
This error indicates that a node's [attestation statement](../architecture/attestation.md) contains measurements that don't match the trusted values expected by the [JoinService](../architecture/microservices.md#joinservice).
This may for example happen if the cloud provider updates the VM's firmware such that it influences the [runtime measurements](../architecture/attestation.md#runtime-measurements) in an unforeseen way.
You can change the expected measurements to resolve the failure.
:::caution
Attestation and trusted measurements are crucial for the security of your cluster.
Be extra careful when manually changing these settings.
When in doubt, check if the encountered [issue is known](https://github.com/edgelesssys/constellation/issues?q=is%3Aopen+is%3Aissue+label%3A%22known+issue%22) or [contact support](https://github.com/edgelesssys/constellation#support).
:::
You can use the `upgrade apply` command to change measurements of a running cluster:
1. Modify the `measurements` key in your local `constellation-conf.yaml` to the expected values.
2. Run `constellation upgrade apply`.
Keep in mind that running `upgrade apply` will also apply any version changes you made in your config to the cluster.
You can run these commands to learn about the versions currently configured in the cluster:
- Kubernetes API server version: `kubectl get nodeversion constellation-version -o json -n kube-system | jq .spec.kubernetesClusterVersion`
- image version: `kubectl get nodeversion constellation-version -o json -n kube-system | jq .spec.imageVersion`
- microservices versions: `helm list --filter 'constellation-services' -n kube-system`