constellation/docs/versioned_docs/version-2.2/workflows/troubleshooting.md

# Troubleshooting

This section aids you in finding problems when working with Constellation.

## Cloud logging

To provide information during early stages of the node's boot process, Constellation logs messages into the cloud providers' log systems. Since these offerings **aren't** confidential, only generic information without any sensitive values are stored. This provides administrators with a high level understanding of the current state of a node.

You can view these information in the follow places:

<tabs groupId="csp">
<tabItem value="azure" label="Azure">

1. In your Azure subscription find the Constellation resource group.
2. Inside the resource group find the Application Insights resource called `constellation-insights-*`.
3. On the left-hand side go to `Logs`, which is located in the section `Monitoring`.
    + Close the Queries page if it pops up.
5. In the query text field type in `traces`, and click `Run`.

To **find the disk UUIDs** use the following query: `traces | where message contains "Disk UUID"`

</tabItem>
<tabItem value="gcp" label="GCP">

1. Select the project that hosts Constellation.
2. Go to the `Compute Engine` service.
3. On the right-hand side of a VM entry select `More Actions` (a stacked ellipsis)
    + Select `View logs`

To **find the disk UUIDs** use the following query: `resource.type="gce_instance" text_payload=~"Disk UUID:.*\n" logName=~".*/constellation-boot-log"`

:::info

Constellation uses the default bucket to store logs. Its [default retention period is 30 days](https://cloud.google.com/logging/quotas#logs_retention_periods).

:::

</tabItem>
<tabItem value="aws" label="AWS">

1. Open [AWS CloudWatch](https://console.aws.amazon.com/cloudwatch/home)
2. Select [Log Groups](https://console.aws.amazon.com/cloudwatch/home#logsV2:log-groups)
3. Select the log group that matches the name of your cluster.
4. Select the log stream for control or worker type nodes.

</tabItem>
</tabs>

## Connect to nodes via SSH

Debugging via a shell on a node is [directly supported by Kubernetes](https://kubernetes.io/docs/tasks/debug/debug-application/debug-running-pod/#node-shell-session).

1. Figure out which node to connect to:

    ```sh
    kubectl get nodes
    # or to see more information, such as IPs:
    kubectl get nodes -o wide
    ```

2. Connect to the node:

    ```sh
    kubectl debug node/constell-worker-xksa0-000000 -it --image=busybox
    ```

    You will be presented with a prompt.

    The nodes file system is mounted at `/host`.

3. Once finished, clean up the debug pod:

    ```sh
    kubectl delete pod node-debugger-constell-worker-xksa0-000000-bjthj
    ```