< Marvin> Im trying add a self signed CA certificate to Pref Prefect Community #ask-marvin

<@ULVA73B9P> Im trying add a self-signed CA certif...

syakesaba

01/12/2025, 1:18 PM

@Marvin Im trying add a self-signed CA certificate to Prefect-Worker 3.1.9 . I prefer using helm to deploy Pod to my k8s. After Deploy, they say "No such CA file" at stderr. any ideas? my helm options set are below.

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--set worker.extraEnvVars[0].name=SSL_CERT_FILE --set-string worker.extraEnvVars[0].value=/ssl/ssl.crt --set worker.extraEnvVars[1].name=PREFECT_API_SSL_CERT_FILE --set-string worker.extraEnvVars[1].value=/ssl/ssl.crt --set worker.extraVolumeMounts[0].name=server-cert --set-string worker.extraVolumeMounts[0].mountPath=/ssl --set-string worker.extraVolumeMounts[0].subPath=ssl.crt --set worker.extraVolumes[0].name=server-cert --set worker.extraVolumes[0].configMap.name=server-cert

Marvin

01/12/2025, 1:19 PM

It seems like the issue you're facing with the "No such CA file" error might be related to how the CA certificate is being mounted and referenced in your Helm deployment. Here are a few things to check and consider: 1. Ensure the ConfigMap Exists: Verify that the ConfigMap

server-cert

is created and contains the

ssl.crt

file. You can check this using:

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bash
   kubectl get configmap server-cert -o yaml

2. Volume and Mount Path: Make sure that the volume and mount paths are correctly specified in your Helm chart. The error suggests that the file might not be present at the expected location. 3. Verify File Path: Double-check that the path

/ssl/ssl.crt

is correct and that the file exists at that location in the Pod. You can do this by logging into the Pod and checking the directory:

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bash
   kubectl exec -it <pod-name> -- /bin/sh
   ls /ssl

4. Environment Variable Configuration: Ensure that the environment variables

SSL_CERT_FILE

and

PREFECT_API_SSL_CERT_FILE

are correctly set and pointing to the right path. According to the Prefect documentation, these variables are used to specify the certificate file. 5. Consider Insecure Skip Verify: As a temporary measure, you can set

PREFECT_API_TLS_INSECURE_SKIP_VERIFY

True

to bypass certificate verification, but this is not recommended for production environments. For more detailed guidance, you can refer to the Prefect documentation on self-hosting and certificates. If the issue persists, consider checking for any related issues in the Prefect GitHub repository, as there might be similar cases or ongoing discussions.

syakesaba

01/12/2025, 1:26 PM

@Marvin

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ls /ssl/
I have no name!@prefect-worker-648d64dbcc-jtm45:~$

I found /ssl is empty. ideas?

Marvin

01/12/2025, 1:26 PM

The empty

/ssl

directory in your Pod indicates that the ConfigMap volume might not be mounted correctly. Here are some steps to troubleshoot and resolve this: 1. Check ConfigMap Creation: Ensure that the ConfigMap

server-cert

is created and contains the

ssl.crt

file. Use the following command to inspect the ConfigMap:

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bash
   kubectl describe configmap server-cert

Make sure that the

ssl.crt

key and its content are present. 2. Review Helm Chart Configuration: Double-check your Helm chart values to ensure that the volume and volume mount configurations are correctly set. Ensure that there are no typos or misconfigurations:

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yaml
   worker:
     extraVolumeMounts:
       - name: server-cert
         mountPath: /ssl
         subPath: ssl.crt
     extraVolumes:
       - name: server-cert
         configMap:
           name: server-cert

3. Verify Pod Configuration: Ensure that the Pod is using the correct volume and volume mounts. You can describe the Pod to see the current configuration:

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bash
   kubectl describe pod <pod-name>

Look for the

Volumes

and

Volume Mounts

sections to verify that they match your Helm chart configuration. 4. Reapply Configurations: If you find any discrepancies, update your Helm chart or Kubernetes manifests and redeploy the Pod. You can reapply the ConfigMap and deployment using:

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bash
   kubectl apply -f <your-configmap-file>.yaml
   helm upgrade <release-name> <chart> --set ...

5. Logs and Events: Check the logs and events for any errors related to volume mounting:

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bash
   kubectl logs <pod-name>
   kubectl get events --sort-by='{.lastTimestamp}'

By ensuring that the ConfigMap is correctly created and mounted, your Pod should be able to access the

ssl.crt

file at the specified path. If issues persist, reviewing the Helm chart and Kubernetes events should provide further insights.

syakesaba

01/12/2025, 1:39 PM

@Marvin Somehow I got worked with these options in my helm command.

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--set worker.extraEnvVars[0].name=SSL_CERT_FILE --set-string worker.extraEnvVars[0].value=/ssl/ssl.crt --set worker.extraEnvVars[1].name=PREFECT_API_SSL_CERT_FILE --set-string worker.extraEnvVars[1].value=/ssl/ssl.crt --set worker.extraVolumeMounts[0].name=server-cert --set-string worker.extraVolumeMounts[0].mountPath=/ssl/ssl.crt --set-string worker.extraVolumeMounts[0].subPath=ssl.crt --set worker.extraVolumes[0].name=server-cert --set-string worker.extraVolumes[0].configMap.name=server-cert

will you describe usage of mountPath and subPath?

Marvin

01/12/2025, 1:39 PM

In Kubernetes, when you mount a volume into a Pod, you can use

mountPath

and

subPath

to control how the volume is presented within the container's filesystem. Here's what each option does: 1. mountPath
: - This is the directory within the container where the volume will be mounted. - It specifies the root directory where the volume becomes accessible to the container. - If you specify just a directory (e.g.,

/ssl

), the entire volume is mounted at that path. 2. subPath
: - This specifies a subdirectory or a specific file within the volume to mount at the

mountPath

. - When you use

subPath

, only the specified subdirectory or file from the volume is mounted at the

mountPath

. - In your case, setting

mountPath

/ssl/ssl.crt

and

subPath

ssl.crt

means that only the

ssl.crt

file from the ConfigMap is mounted at the path

/ssl/ssl.crt

within the container. This configuration is useful when you want to mount a specific file from a volume rather than the entire volume, which can help in organizing files and avoiding conflicts in the container's filesystem. It seems like using

mountPath

and

subPath

in this way resolved your issue by correctly mounting the

ssl.crt

file to the expected location.

syakesaba

01/12/2025, 1:58 PM

@Marvin Thank you but pointing

SSL_CERT_FILE

and

PREFECT_API_SSL_CERT_FILE

to /ssl/ssl.crt does not resolve issue that there is no flow-run graphs at the Runs window. the message was occured again. WARNING | prefect.events.clients - Unable to connect to wss://myhost.com/api/events/in . Please check your network settings to ensure websocket connections to the API are allowed. Otherwise event data (including task run data) may be lost. Reason: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self-signed certificate (_ssl.c:1006). Set PREFECT_DEBUG_MODE=1 to see the full error. sad:

Marvin

01/12/2025, 1:59 PM

The error message you're encountering indicates that the self-signed certificate isn't being trusted by the system, leading to SSL verification failures. Here are some steps you can take to address this issue: 1. System Trust Store: Ensure that your self-signed certificate is added to the system's trust store. This might involve updating the CA certificates on the machine running your Prefect worker. This step is crucial as simply pointing to the certificate file might not be enough if the system doesn't inherently trust it. 2. Environment Variables: - Confirm that the

SSL_CERT_FILE

environment variable is correctly pointing to the self-signed certificate file. - Consider setting

PREFECT_API_TLS_INSECURE_SKIP_VERIFY

True

as a temporary measure to bypass SSL verification. Note that this is insecure and should only be used for testing purposes. 3. Network and Proxy Configuration: - Check if there are any network proxies in your environment that might be interfering with the websocket connections. Ensure that any necessary proxy settings are configured via

HTTPS_PROXY

HTTP_PROXY

, or

NO_PROXY

environment variables. 4. Debugging: - Set

PREFECT_DEBUG_MODE=1

to get more detailed error messages and logs, which might provide additional insights into what might be going wrong. For more detailed guidance, you can refer to the Prefect documentation on self-hosting and certificates. If the issue persists, you might need to consult with your network or system administrator to ensure that the certificate is correctly configured and trusted across your network infrastructure.

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