Linux - K8S - 调度策略 - 拓扑调度

## 拓扑调度

```sh
# 为所有node添加标识
[22:57:52 root@master1 scheduler]#kubectl label node master1 node=master1 zone=zoneA
node/master1 labeled
[22:59:35 root@master1 scheduler]#kubectl label node node1.noisedu.cn  node=node1 zone=zoneA
node/node1.noisedu.cn labeled
[22:59:53 root@master1 scheduler]#kubectl label node node2.noisedu.cn node=node2 zone=zoneB
node/node2.noisedu.cn labeled

# 应用资源文件，所有节点分布是3：3：1
[23:02:51 root@master1 scheduler]#cat 16-scheduler-pod-topology-test.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pod-affinity-preferred
spec:
  replicas: 7
  selector:
    matchLabels:
      foo: bar
  template:
    metadata:
      labels:
        foo: bar
    spec:
      containers:
      - name: pod-test
        image: 10.0.0.55:80/mykubernetes/pod_test:v0.1
        imagePullPolicy: IfNotPresent
      topologySpreadConstraints:
      - maxSkew: 3
        topologyKey: zone
        whenUnsatisfiable: DoNotSchedule
        labelSelector:
          matchLabels:
            foo: bar
[23:02:55 root@master1 scheduler]#kubectl apply -f 16-scheduler-pod-topology-test.yaml 
deployment.apps/pod-affinity-preferred created
[23:03:01 root@master1 scheduler]#kubectl get pod -o wide 
NAME                                      READY   STATUS    RESTARTS   AGE   IP            NODE               NOMINATED NODE   READINESS GATES
pod-affinity-preferred-84567586c8-2dlfp   1/1     Running   0          10s   10.244.3.7    node1.noisedu.cn   <none>           <none>
pod-affinity-preferred-84567586c8-bzm2g   1/1     Running   0          9s    10.244.4.5    node2.noisedu.cn   <none>           <none>
pod-affinity-preferred-84567586c8-gk5g5   1/1     Running   0          9s    10.244.4.7    node2.noisedu.cn   <none>           <none>
pod-affinity-preferred-84567586c8-jf2nq   1/1     Running   0          10s   10.244.3.8    node1.noisedu.cn   <none>           <none>
pod-affinity-preferred-84567586c8-swgxt   1/1     Running   0          9s    10.244.3.10   node1.noisedu.cn   <none>           <none>
pod-affinity-preferred-84567586c8-xjlx8   1/1     Running   0          10s   10.244.4.6    node2.noisedu.cn   <none>           <none>
pod-affinity-preferred-84567586c8-zdb75   1/1     Running   0          9s    10.244.3.9    node1.noisedu.cn   <none>           <none>

```