What are Kubernetes Scheduler Profiles?

Question

Accepted Answer

**Scheduler Profiles** — configurable scheduling profiles with different strategies.

**Default profiles:**
- **QueueSort** — queue (FIFO).
- **Filter** — node filtering.
- **Score** — node scoring.
- **Bind** — binding.

**Custom Scheduler (KubeSchedulerConfiguration):**
```yaml
apiVersion: kubescheduler.config.k8s.io/v1
kind: KubeSchedulerConfiguration
profiles:
  - schedulerName: default-scheduler
    plugins:
      score:
        enabled:
          - name: NodeResourcesFit
            weight: 1
          - name: InterPodAffinity
            weight: 1
    pluginConfig:
      - name: NodeResourcesFit
        args:
          scoringStrategy:
            type: LeastAllocated
            resources:
              - name: cpu
                weight: 1
              - name: memory
                weight: 1

- schedulerName: gpu-scheduler
    plugins:
      filter:
        enabled:
          - name: NodeResourcesFit
    pluginConfig:
      - name: NodeResourcesFit
        args:
          scoringStrategy:
            type: MostAllocated  # Pack pods tightly
            resources:
              - name: nvidia.com/gpu
                weight: 1
```

**Scoring strategies:**
- **LeastAllocated** — distributes evenly.
- **MostAllocated** — packs tightly (saves resources).
- **RequestedToCapacityRatio** — weights for each load level.

**Binding to Pod:** `schedulerName: gpu-scheduler` in Pod spec.

DevOps: What are Kubernetes Scheduler Profiles?