【k8s】Pod-topologySpreadConstraints
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环境
- kubernetes 1.20.4
- Spring Boot 2.5.0-M3
目标
topologySpreadConstraints 表示拓扑分布约束,可以控制 Pod 在某些节点的分布。
示例
设置地点分布
[root@master ~]# kubectl get nodes --show-labels
NAME STATUS ROLES AGE VERSION LABELS
master Ready control-plane,master 63d v1.20.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node-role.kubernetes.io/master=
node1 Ready <none> 63d v1.20.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node1,kubernetes.io/os=linux
node2 Ready <none> 63d v1.20.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node2,kubernetes.io/os=linux
[root@master ~]# kubectl label nodes node1 address=ChongQing
node/node1 labeled
[root@master ~]# kubectl label nodes node2 address=BeiJing
node/node2 labeled
[root@master ~]# kubectl get nodes --show-labels
NAME STATUS ROLES AGE VERSION LABELS
master Ready control-plane,master 63d v1.20.4 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node-role.kubernetes.io/master=
node1 Ready <none> 63d v1.20.4 address=ChongQing,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node1,kubernetes.io/os=linux
node2 Ready <none> 63d v1.20.4 address=BeiJing,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node2,kubernetes.io/os=linux
[root@master ~]#
ReplicationController.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: spring-k8s
spec:
replicas: 2
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: spring-k8s
image: jiangbo920827/spring-k8s:liveness
ports:
- containerPort: 8080
查看
[root@master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
spring-k8s 1/1 Running 0 48m 10.244.2.172 node2 <none> <none>
spring-k8s-4fkm7 1/1 Running 0 14s 10.244.2.176 node2 <none> <none>
spring-k8s-r9c7x 1/1 Running 0 14s 10.244.2.175 node2 <none> <none>
可以看到两个 Pod 分布到了同一个节点上。
分布约束
apiVersion: v1
kind: ReplicationController
metadata:
name: spring-k8s
spec:
replicas: 2
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: spring-k8s
image: jiangbo920827/spring-k8s:liveness
ports:
- containerPort: 8080
topologySpreadConstraints:
- topologyKey: address
maxSkew: 1
whenUnsatisfiable: DoNotSchedule
labelSelector:
matchLabels:
app: myapp
topologyKey 表示按照什么标签进行区分;
whenUnsatisfiable 表示不满足时采取什么策略,DoNotSchedule 表示不调度,ScheduleAnyway 表示任然调度;
maxSkew 表示几个区域相差的最大值;
labelSelector 表示标签选择器。
查看分布约束
[root@master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
spring-k8s 1/1 Running 0 55m 10.244.2.172 node2 <none> <none>
spring-k8s-89p7d 1/1 Running 0 20s 10.244.2.181 node2 <none> <none>
spring-k8s-v4nqb 1/1 Running 0 20s 10.244.1.219 node1 <none> <none>
总结
topologySpreadConstraints 可以在多个域之间平衡 Pod 数量。
附录
原文:https://www.cnblogs.com/jiangbo44/p/14588964.html
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