加强网站建设 实施政务公开,wordpress企业网站模板,dw软件下载官方免费下载,设计师可以赚钱的网站使用背景和场景 业务中的某个关键服务#xff0c;配置了多个replica#xff0c;结果在部署时#xff0c;发现多个相同的副本同时部署在同一个主机上#xff0c;结果主机故障时#xff0c;所有副本同时漂移了#xff0c;导致服务间断性中断 基于以上背景#xff0c;实现…使用背景和场景 业务中的某个关键服务配置了多个replica结果在部署时发现多个相同的副本同时部署在同一个主机上结果主机故障时所有副本同时漂移了导致服务间断性中断 基于以上背景实现一个服务的多个副本分散到不同的主机上使每个主机有且只能运行服务的一个副本这里用到的是Pod anti-affinity属性即pod反亲和性特性是根据已经运行在node上的pod的label不再将相同label的pod也调度到该node实现每个node上只运行一个副本的pod pod亲和性和反亲和性的区别 亲和性podAffinity和指定label的pod部署在相同node上 反亲和性podAntiAffinity不想和指定label的pod的服务部署在相同node上 podAntiAffinity实战部署 反亲和性分软性要求和硬性要求 requiredDuringSchedulingIgnoredDuringExecution硬性要求必须满足条件保证分散部署的效果最好使用用此方式 preferredDuringSchedulingIgnoredDuringExecution软性要求可以不完全满足即有可能同一node上可以跑多个副本 # 配置如下只需要修改label的配置即matchExpressions中的key和values的值# 硬性要求 # 如果节点上的pod标签存在满足appnginx则不能部署到节点上spec:affinity:podAntiAffinity:requiredDuringSchedulingIgnoredDuringExecution:- labelSelector:matchExpressions:- key: appoperator: Invalues:- nginxtopologyKey: kubernetes.io/hostname# 软性要求 # 如果节点上的pod标签存在满足appnginx也可以部署到节点上尽可能先部署到其它节点如果没有满足也可以部署到此节点大概是这么理解吧spec:affinity:podAntiAffinity:preferredDuringSchedulingIgnoredDuringExecution:- weight: 100podAffinityTerm:- labelSelector:matchExpressions:- key: appoperator: Invalues:- nginxtopologyKey: kubernetes.io/hostname 附完整的deployment.yaml配置 apiVersion: apps/v1 kind: Deployment metadata:name: nginxlabels:app: nginx spec:replicas: 3strategy:rollingUpdate:maxSurge: 30%maxUnavailable: 0type: RollingUpdateminReadySeconds: 10selector:matchLabels:app: nginxtemplate:metadata:labels:app: nginxspec:affinity:podAntiAffinity:requiredDuringSchedulingIgnoredDuringExecution:- labelSelector:matchExpressions:- key: appoperator: Invalues:- nginxtopologyKey: kubernetes.io/hostnamerestartPolicy: Alwayscontainers:- name: nginximage: nginximagePullPolicy: IfNotPresentports:- containerPort: 80name: httpprotocol: TCP实际生产环境用的pod反亲和性 podAntiAffinity:requiredDuringSchedulingIgnoredDuringExecution:# Never schedule multiple replicas on the same node- topologyKey: kubernetes.io/hostnamelabelSelector:matchLabels:app.kubernetes.io/name: ${service}app.kubernetes.io/instance: ${service} apiVersion: apps/v1 kind: Deployment metadata:name: ${service}labels:app.kubernetes.io/name: ${service}app.kubernetes.io/version: 0.0.0app.kubernetes.io/instance: ${service}environment: ${env} spec:replicas: ${replicas}revisionHistoryLimit: 5selector:matchLabels:app.kubernetes.io/name: ${service}strategy:rollingUpdate:maxSurge: 25%maxUnavailable: 25%type: RollingUpdatetemplate:metadata:labels:app.kubernetes.io/name: ${service}app.kubernetes.io/version: 0.0.0app.kubernetes.io/instance: ${service}logging: falsearmsPilotAutoEnable: offarmsPilotCreateAppName: ${service}-${env}spec:serviceAccountName: defaultdnsPolicy: ClusterFirstimagePullSecrets:- name: gemdale-registry.cn-shenzhen.cr.aliyuncs.com-secretcontainers:- name: ${service}image: ${image}imagePullPolicy: IfNotPresentenv:- name: CONSUL_HOSTvalueFrom:fieldRef:fieldPath: status.hostIP- name: ELASTIC_APM_SERVER_URLSvalue: http://apm-server.logging:8200- name: HOST_IPvalueFrom:fieldRef:fieldPath: status.hostIP- name: SERVER_PORTvalue: 80- name: JAVA_OPTSvalue: -Duser.timezoneAsia/Shanghai- name: WFWAPPvalue: wfw-applogvolumeMounts:- mountPath: /data/appdata/name: appdata- mountPath: /data/config-repo/name: config-repo- mountPath: /data/logs/name: logs- mountPath: /mnt/hgfs/name: mnt-hgfsports:- containerPort: 80name: httpresources:{}affinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: microserviceoperator: Invalues:- truepodAntiAffinity:requiredDuringSchedulingIgnoredDuringExecution:# Never schedule multiple replicas on the same node- topologyKey: kubernetes.io/hostnamelabelSelector:matchLabels:app.kubernetes.io/name: ${service}app.kubernetes.io/instance: ${service}volumes:- hostPath:path: /data/appdata/type: DirectoryOrCreatename: appdata- hostPath:path: /data/config-repo/type: DirectoryOrCreatename: config-repo- hostPath:path: /data/logs/type: DirectoryOrCreatename: logs- hostPath:path: /mnt/hgfs/type: DirectoryOrCreatename: mnt-hgfs --- apiVersion: v1 kind: Service metadata:name: ${service}labels:app.kubernetes.io/name: ${service}app.kubernetes.io/version: 0.0.0app.kubernetes.io/instance: ${service}environment: ${env} spec:type: ClusterIPports:- name: httpport: 80protocol: TCPtargetPort: httpselector:app.kubernetes.io/name: ${service}app.kubernetes.io/instance: ${service}