DevOps: What is Kubernetes Resource Bin Packing?

1# Scheduler Configuration
2apiVersion: kubescheduler.config.k8s.io/v1
3kind: KubeSchedulerConfiguration
4profiles:
5- schedulerName: default-scheduler
6  plugins:
7    score:
8      enabled:
9      - name: NodeResourcesFit
10        weight: 1
11      disabled:
12      - name: NodeResourcesLeastAllocated
13      enabled:
14      - name: NodeResourcesMostAllocated
15        weight: 1
16      - name: NodeResourcesBalancedAllocation
17        weight: 1
18  pluginConfig:
19  - name: NodeResourcesFit
20    args:
21      scoringStrategy:
22        type: MostAllocated
23        resources:
24        - name: cpu
25          weight: 1
26        - name: memory
27          weight: 1
28---
29# Pod with resource requests for bin packing
30apiVersion: apps/v1
31kind: Deployment
32metadata:
33  name: myapp
34spec:
35  replicas: 10
36  template:
37    spec:
38      containers:
39      - name: app
40        image: myapp:latest
41        resources:
42          requests:
43            cpu: "500m"
44            memory: "256Mi"
45          limits:
46            cpu: "1000m"
47            memory: "512Mi"

1# Check node utilization
2kubectl top nodes
3kubectl describe node node-1 | grep -A 5 "Allocated resources"
4
5# Check Pod distribution
6kubectl get pods -o wide | awk 'NR>1{print $7}' | sort | uniq -c | sort -rn
7
8# Verify resource requests vs actual
9kubectl get pods -o json | jq '.items[] | {name: .metadata.name, cpu_req: .spec.containers[0].resources.requests.cpu, mem_req: .spec.containers[0].resources.requests.memory}'
10
11# Check scheduler decisions
12kubectl get events --field-selector reason=Scheduled
13kubectl logs -n kube-system -l component=kube-scheduler | grep -i "fit\|score"