kubernetes高级调度简单说明

1.查看node label

kubectl get nodes --show-labels=true

2.创建label

kubectl label node $(node_name) ?$key=$value

3.更新label

kubectl label --overwrite node ?$(node_name) ?$key=$value

4.删除

kubectl label node $(node_name) ?$key-

Node调度几种模式

首先看一下，我测试环境node label

1.nodeName模式

apiVersion: extensions/v1beta1kind: Deploymentmetadata: ?name: hello-world spec: ?replicas: 3 ?template: ???metadata: ?????labels: ???????k8s-app: hello-world ????spec: ?????nodeName: node1 ?????containers: ?????- name: hello-world ????????image: registry.cn-qingdao.aliyuncs.com/icommon/hello-world:latest

2.nodeSelector模式

apiVersion: extensions/v1beta1kind: Deploymentmetadata: ?name: hello-world spec: ?replicas: 3 ?template: ???metadata: ?????labels: ???????k8s-app: hello-world ????spec: ?????nodeSelector: ???????kubernetes.io/hostname: node1 ?????????containers: ?????- name: hello-world ????????image: registry.cn-qingdao.aliyuncs.com/icommon/hello-world:latest

3.affinity模式

kind: DeploymentapiVersion: extensions/v1beta1metadata: ?name: hello-worldspec: ?replicas: 4 ?template: ???metadata: ?????labels: ???????app: hello-world ???spec: ?????containers: ?????- name: hello-world ???????image: registry.cn-qingdao.aliyuncs.com/icommon/hello-world:latest ?????affinity: ???????nodeAffinity: ?????????requiredDuringSchedulingIgnoredDuringExecution: ???????????nodeSelectorTerms: ???????????- matchExpressions: ?????????????- key: "kubernetes.io/hostname" ???????????????operator: NotIn ???????????????values: ["node2"] ?????????preferredDuringSchedulingIgnoredDuringExecution: ?????????- weight: 10 ???????????preference: ?????????????matchExpressions: ?????????????- key: zone ????????????????operator: In ???????????????values: ???????????????- ali

解读：
上面规则说明：除node2节点外，分配到zone=ali标签的node上，反之随机调度
requiredDuringSchedulingIgnoredDuringExecution ：硬要求，在调度期间要求满足亲和性或者反亲和性规则，如果不能满足规则，则POD不能被调度到对应的主机上。在之后的运行过程中，系统不会再检查这些规则是否满足。
preferredDuringSchedulingIgnoredDuringExecution：软要求，在调度期间尽量满足亲和性或者反亲和性规则，如果不能满足规则，POD也有可能被调度到对应的主机上。在之后的运行过程中，系统不会再检查这些规则是否满足。
operator四种模式： In NotIn Exists NotExists

Taints and Tolerations （污点和容忍）

运行下面命令，标记节点为污点进行测试

kubectl taint nodes node1 node-role/node1=:NoSchedule

kind: DeploymentapiVersion: extensions/v1beta1metadata: ?name: hello-worldspec: ?replicas: 4 ?template: ???metadata: ?????labels: ???????app: hello-world ???spec: ?????tolerations: ?????- key: node-role/node1 ???????operator: Exists ???????effect: NoSchedule ?????containers: ?????- name: hello-world ???????image: registry.cn-qingdao.aliyuncs.com/icommon/hello-world:latest ?????affinity: ???????nodeAffinity: ?????????requiredDuringSchedulingIgnoredDuringExecution: ???????????nodeSelectorTerms: ???????????- matchExpressions: ?????????????- key: "kubernetes.io/hostname" ???????????????operator: In ???????????????values: ["node1"]

Pod调度模式

kind: DeploymentapiVersion: extensions/v1beta1metadata: ?name: hello-worldspec: ?replicas: 4 ?template: ???metadata: ?????labels: ???????app: hello-world ???spec: ?????containers: ?????- name: hello-world ???????image: registry.cn-qingdao.aliyuncs.com/icommon/hello-world:latest ?????affinity: ???????podAffinity: ?????????requiredDuringSchedulingIgnoredDuringExecution: ?????????- labelSelector: ?????????????matchExpressions: ?????????????- key: k8s-app ???????????????operator: In ???????????????values: ???????????????- redis ?????????????topologyKey: kubernetes.io/hostname ????????podAntiAffinity: ?????????preferredDuringSchedulingIgnoredDuringExecution: ?????????- weight: 1 ???????????podAffinityTerm: ?????????????labelSelector: ???????????????matchExpressions: ???????????????- key: k8s-app ?????????????????operator: NotIn ?????????????????values: ?????????????????- nginx ?????????????topologyKey: kubernetes.io/hostname

kubernetes高级调度简单说明

原文地址：http://blog.51cto.com/2759492/2088997