注册网站域名需要什么资料医疗器械,评价一个网站设计的好坏,邯郸恋家网,天猫购买平台文章目录 一、概念二、实操节点亲和力1三、实操pod亲和力2 一、概念 节点亲和力概念#xff08;反亲和力相反#xff09; ps#xff1a;官方文档http://kubernetes.p2hp.com/docs/concepts/scheduling-eviction/assign-pod-node.html 节点亲和力#xff08;Node Affinity反亲和力相反 ps官方文档http://kubernetes.p2hp.com/docs/concepts/scheduling-eviction/assign-pod-node.html 节点亲和力Node Affinity是在 Pod 上定义的一组约束用于确定哪些节点适合进行调度即使用亲和性规则为 Pod 的节点分配定义硬性要求和软性要求。类似于nodeSelector你可以根据节点上的标签来约束Pod可以调度到哪些节点上。节点亲和性有两种: 1requiredDuringSchedulingIgnoredDuringExecution硬亲和力调度器只有在规则被满足的时候才能执行调度。 类似于nodeselector 但其语法表达能力更强。 2preferredDuringSchedulingIgnoredDuringExecution软亲和力调度器会尝试寻找满足对应规则的节点。如果找不到匹配的节点调度器仍然会调度该Pod。优选尽量满足匹配条件的节点。 亲和力匹配条件 ln满足一个就行
NotIn一个都不能满足反亲和性
Exists只要存在就满足
DoesNotExist只有不存在。才满足
Gt必须要大于节点上的数值才满足
Lt必须小于节点上的数值才满足二、实操节点亲和力1 给node2打标签kubectl label no worker2 nginxpermit 创建nginx的deploy,设置节点亲和 vi nginx-deployment apiVersion: apps/v1
kind: Deployment
metadata:name: nginx-deployment
spec:replicas: 3selector:matchLabels:app: nginx-podtemplate:metadata:labels:app: nginx-podspec:affinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: nginxoperator: Invalues:- permitcontainers:- name: nginx-containerimage: nginx:latestports:- name: nginx-portcontainerPort: 80protocol: TCP查看podkubectl get pod -o wide
三、实操pod亲和力2
ps根据节点上是否存在指定标签的pod来判断pod是否调度到该节点 创建nginx的deploy,设置节点亲和 vi /opt/nginx_podaffinity.yaml ps将pod节点部署到拥有appnginx-pod的pod的节点上 apiVersion: apps/v1
kind: Deployment
metadata:name: nginx-podaffinity
spec:replicas: 3selector:matchLabels:app: nginx-podaffinitytemplate:metadata:labels:app: nginx-podaffinityspec:affinity:podAffinity:requiredDuringSchedulingIgnoredDuringExecution:- labelSelector:matchExpressions:- key: appoperator: Invalues:- nginx-podtopologyKey: kubernetes.io/hostnamecontainers:- name: nginx-containerimage: nginx:latestports:- name: nginx-portcontainerPort: 80protocol: TCP创建podkubectl apply -f /opt/nginx_podaffinity.yaml 查看kubectl get pod -o wide ps因为只有worker2满足所以都部署到第二个去了
