kubeflow/trainer

[Feature]: PodSet Container to support Image and Command

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#3,177 opened on Feb 5, 2026

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Description

What you would like to be added?

Problem: If we want to manipulate a Container or InitContainer on the JobSet, e.g., here we need to expose the Image and Command for the InitContainer, which are generally needed. We cannot use PodSet for InitContainer without this exposure. The ultimate goal is to have the PodSet interface map onto the actual Jobset (e.g., PodSet -> runtime.Container -> JobSet) with changed Image and Command. Note that tests can then be refactored too (reference)

Why is this needed?

Customization of Image/Command for InitContainers is generally desired. For the Flux Policy PR/integration we are not able to use PodSet without it: https://github.com/kubeflow/trainer/pull/3064#issuecomment-3815049315

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Contributor guide

Research direction
Investigate the PodSet interface in the runtime package, trace how containers are currently handled (e.g., in runtime.go), and extend the interface to expose Image and Command. Refer to the linked PR (#3064) for context on Flux Policy integration.
Tech stack
go
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoKubernetes
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40