Adding Semver comparison operators for both NodeAffinity and Tolerations

[galal-hussein]

Enhancement Description

Currently, Kubernetes tolerations and NodeAffinity rules lack semantic versioning support. This feature will allow filtering based on semver ranges (e.g., >=v1.26.0) by adding new comparison operators:

• SemverLt
• SemverGt
• SemverEq

This enables clean support for firmware checks, Kubernetes version preferences, and other semver-based scheduling use cases.

Examples

Tolerations

tolerations:
  - key: "node.kubernetes.io/kubelet-version"
    operator: "SemverGt"
    value: "v1.28.0"

NodeAffinity

nodeAffinity:
  requiredDuringSchedulingIgnoredDuringExecution:
    nodeSelectorTerms:
      - matchExpressions:
          - key: "kubeletVersion"
            operator: "SemverEq"
            values: ["v1.28.0"]

Background

Current KEP #5471 focuses on integer operators only compliance for SLA/failure-probability for tolerations by adding Gt and Lt operators. Similarly this enhancement will involve parsing semantic versioning and using the new operators to support various scenarios, for example:

• Comparing node kubelet versions (e.g., feature gating)
• Firmware version targeting for device scheduling

/sig scheduling
/sig apps

• One-line enhancement description (can be used as a release note): Add Semantic Version Comparison operators to Tolerations and NodeAffinity.
• Discussion Link:
• PRs by stage and milestone:
  • Alpha - v1.xx
    • KEP (k/enhancements) update PR(s):
    • Code (k/k) update PR(s):
    • Docs (k/website) update PR(s):

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

[galal-hussein]

/assign

[helayoty]

/triage accepted