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Developer Guide

This developer guide is for people who want to contribute to the Katib project. If you're interesting in using Katib in your machine learning project, see the following user guides:

Requirements

Build from source code

Check source code as follows:

make build REGISTRY=<image-registry> TAG=<image-tag>

To use your custom images for the Katib components, modify Kustomization file and Katib Config

You can deploy Katib v1beta1 manifests into a Kubernetes cluster as follows:

make deploy

You can undeploy Katib v1beta1 manifests from a Kubernetes cluster as follows:

make undeploy

Technical and style guide

The following guidelines apply primarily to Katib, but other projects like Training Operator might also adhere to them.

Go Development

When coding:

  • Follow effective go guidelines.
  • Run locally make check to verify if changes follow best practices before submitting PRs.

Testing:

  • Use cmp.Diff instead of reflect.Equal, to provide useful comparisons.
  • Define test cases as maps instead of slices to avoid dependencies on the running order. Map key should be equal to the test case name.

Modify controller APIs

If you want to modify Katib controller APIs, you have to generate deepcopy, clientset, listers, informers, open-api and Python SDK with the changed APIs. You can update the necessary files as follows:

make generate

Controller Flags

Below is a list of command-line flags accepted by Katib controller:

Name Type Default Description
katib-config string "" The katib-controller will load its initial configuration from this file. Omit this flag to use the default configuration values.

DB Manager Flags

Below is a list of command-line flags accepted by Katib DB Manager:

Name Type Default Description
connect-timeout time.Duration 60s Timeout before calling error during database connection

Workflow design

Please see workflow-design.md.

Katib admission webhooks

Katib uses three Kubernetes admission webhooks.

  1. validator.experiment.katib.kubeflow.org - Validating admission webhook to validate the Katib Experiment before the creation.

  2. defaulter.experiment.katib.kubeflow.org - Mutating admission webhook to set the default values in the Katib Experiment before the creation.

  3. mutator.pod.katib.kubeflow.org - Mutating admission webhook to inject the metrics collector sidecar container to the training pod. Learn more about the Katib's metrics collector in the Kubeflow documentation.

You can find the YAMLs for the Katib webhooks here.

Note: If you are using a private Kubernetes cluster, you have to allow traffic via TCP:8443 by specifying the firewall rule and you have to update the master plane CIDR source range to use the Katib webhooks

Katib cert generator

Katib Controller has the internal cert-generator to generate certificates for the webhooks.

Once Katib is deployed in the Kubernetes cluster, the cert-generator follows these steps:

  • Generate the self-signed certificate and private key.

  • Update a Kubernetes Secret with the self-signed TLS certificate and private key.

  • Patch the webhooks with the CABundle.

Once the cert-generator finished, the Katib controller starts to register controllers such as experiment-controller to the manager.

You can find the cert-generator source code here.

NOTE: the Katib also supports the cert-manager to generate certs for the admission webhooks instead of using cert-generator. You can find the installation with the cert-manager here.

Implement a new algorithm and use it in Katib

Please see new-algorithm-service.md.

Katib UI documentation

Please see Katib UI README.

Design proposals

Please see proposals.