1、Kubernetes 调度器 - 调度说明
https://blog.csdn.net/wtl1992/article/details/104982548
2、Kubernetes 调度器 - 调度亲和性
https://blog.csdn.net/wtl1992/article/details/104983234
3、Kubernetes 调度器 - 污点
https://blog.csdn.net/wtl1992/article/details/105041339
4、Kubernetes 调度器 - 固定节点
https://blog.csdn.net/wtl1992/article/details/105043138
案例:
节点亲和性
pod.spec.nodeAffinity
preferredDuringSchedulingIgnoredDuringExecution:软策略
requiredDuringSchedulingIgnoredDuringExecution:硬策略
指定到 kubernetes.io/hostname=xgcloud-ops-k8s-cluster-2.novalocal 有这个标签的机器
requiredDuringSchedulingIgnoredDuringExecution:硬策略
[root@xgcloud-ops-k8s-cluster-4 nodeaff]# cat pod2.yaml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
version: v1
spec:
containers:
- name: app
image: nginx
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- xgcloud-ops-k8s-cluster-2.novalocal
preferredDuringSchedulingIgnoredDuringExecution:软策略
[root@xgcloud-ops-k8s-cluster-4 nodeaff]# cat pod3.yaml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod3
labels:
app: myapp-pod3
version: v1
spec:
containers:
- name: myapp-pod3
image: nginx
affinity:
nodeAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 1
preference:
matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- xgcloud-ops-k8s-cluster-5.novalocal
kubectl apply -f pod3.yaml
kubectl get pod -o wide
指定了xgcloud-ops-k8s-cluster-5.novalocal,没有这个node,但是还是成功running,调度到了 xgcloud-ops-k8s-cluster-1.novalocal
preferredDuringSchedulingIgnoredDuringExecution:软策略
requiredDuringSchedulingIgnoredDuringExecution:硬策略
一起进行配置:
[root@xgcloud-ops-k8s-cluster-4 nodeaff]# cat pod4.yaml apiVersion: v1 kind: Pod metadata: name: myapp-pod4 labels: app: myapp-pod4 version: v1 spec: containers: - name: myapp-pod4 image: nginx affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - xgcloud-ops-k8s-cluster-3.novalocal preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 preference: matchExpressions: - key: kubernetes.io/hostname operator: In values: - xgcloud-ops-k8s-cluster-5.novalocal
kubectl apply -f pod4.yaml
kubectl describe pod/myapp-pod4
kubectl get pod -o wide
pod亲和性
pod.spec.affiffiffinity.podAffiffiffinity/podAntiAffiffiffinity
没找到别的容器,暂时不测了,用法差不多
跑一个pod2
apiVersion: v1 kind: Pod metadata: name: myapp-pod labels: app: myapp version: v1 spec: containers: - name: app image: nginx affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - xgcloud-ops-k8s-cluster-2.novalocal
跑一个pod3跟他pod亲和
apiVersion: v1 kind: Pod metadata: name: myapp-pod3 labels: app: myapp-pod3 version: v1 spec: containers: - command: - "sleep" - "3600" name: myapp-pod3 image: busybox affinity: podAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchExpressions: - key: app operator: In values: - myapp topologyKey: kubernetes.io/hostname podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 podAffinityTerm: labelSelector: matchExpressions: - key: app operator: In values: - myapp-pod4 topologyKey: kubernetes.io/hostname