unable to spawn jupyter notebook - volume name is too long

[kkasravi]

using IAP and a G suite account kam.d.kasravi@intel.com I get the following error when attempting to create the POD

Error: (422) Reason: error HTTP response headers: HTTPHeaderDict({'Audit-Id': '18fc2109-861e-4c94-943e-1946b9dbc2e5', 'Content-Type': 'application/json', 'Date': 'Wed, 11 Jul 2018 14:53:33 GMT', 'Content-Length': '942'}) HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Pod "jupyter-accounts-2egoogle-2ecom-3akam-2ed-2ekasravi-40intel-2ecom" is invalid: [spec.volumes[0].name: Invalid value: "volume-accounts-2egoogle-2ecom-3akam-2ed-2ekasravi-40intel-2ecom": must be no more than 63 characters, spec.containers[0].volumeMounts[0].name: Not found: "volume-accounts-2egoogle-2ecom-3akam-2ed-2ekasravi-40intel-2ecom"]","reason":"Invalid","details":{"name":"jupyter-accounts-2egoogle-2ecom-3akam-2ed-2ekasravi-40intel-2ecom","kind":"Pod","causes":[{"reason":"FieldValueInvalid","message":"Invalid value: "volume-accounts-2egoogle-2ecom-3akam-2ed-2ekasravi-40intel-2ecom": must be no more than 63 characters","field":"spec.volumes[0].name"},{"reason":"FieldValueNotFound","message":"Not found: "volume-accounts-2egoogle-2ecom-3akam-2ed-2ekasravi-40intel-2ecom"","field":"spec.containers[0].volumeMounts[0].name"}]},"code":422}

[jlewi]

I think the problem is that kubeform_spawner is using the user id in the pod name and not truncating it in the case when pod names end up too long.

I don't think this issue is necessarily GCP or IAP specific. Its probably just more likely in that case because we are using the user's email which tends to be longer. Wheras using username probably leads to shorter issues.

[jlewi]

It doesn't look like our existing spawner specifies a pattern for the pod name
https://github.com/kubeflow/kubeflow/blob/master/kubeflow/core/kubeform_spawner.py

[jlewi]

It looks like kube spawner has an option
pod_name_template
http://jupyterhub-kubespawner.readthedocs.io/en/latest/spawner.html#module-kubespawner.spawner

[jlewi]

Might
Need to wait for 0.2.2 I don't want to keep blocking 0.2.1

[jlewi]

Some suggestions

• Truncate pod name

  • Ideally we'd use a deterministic hash of the full name to avoid conflicts but not sure if kube spawner
    makes that doable.

• Can we add a label for the username? Also truncated

[kkasravi]

I'll submit a PR with a config pod_name_template and pvc_name_template

Code to create the names is here