亲和性_（2022版）一套教程搞定k8s安装到实战|Affinity

篇首语：本文由编程笔记#小编为大家整理，主要介绍了（2022版）一套教程搞定k8s安装到实战 | Affinity相关的知识，希望对你有一定的参考价值。

视频来源&＃xff1a;B站《&＃xff08;2022版&＃xff09;最新、最全、最详细的Kubernetes&＃xff08;K8s&＃xff09;教程&＃xff0c;从K8s安装到实战一套搞定》

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附上汇总贴&＃xff1a;&＃xff08;2022版&＃xff09;一套教程搞定k8s安装到实战 | 汇总_COCOgsta的博客-CSDN博客

NodeAffinity&＃xff1a;节点亲和力

• RequiredDuringSchedulingIgnoredDuringExecution&＃xff1a;硬亲和力&＃xff0c;既支持必须部署在指定的节点上&＃xff0c;也支持必须不部署在指定的节点上。

• PreferredDuringSchedulingIgnoredDuringExecution&＃xff1a;软亲和力&＃xff0c;尽量部署在满足条件的节点上&＃xff0c;或者是尽量不要部署在被匹配的节点。

PodAffinity&＃xff1a;Pod亲和力

• A应用B应用C应用&＃xff0c;将A应用根据某种策略尽量或者部署在一块。Label

  
  
  • A&＃xff1a;app&＃61;a B&＃xff1a;app&＃61;b
  • RequiredDuringSchedulingIgnoredDuringExecution&＃xff1a;将A应用和B应用部署在一块
  • PreferredDuringSchedulingIgnoredDuringExecution&＃xff1a;尽量将A应用和B应用部署在一块

PodAntiAffinity&＃xff1a;Pod反亲和力

• A应用B应用C应用&＃xff0c;将A应用根据某种策略尽量或不部署在一块。Label

  
  
  • RequiredDuringSchedulingIgnoredDuringExecution&＃xff1a;不要将A应用与与之匹配的应用部署在一块
  • PreferredDuringSchedulingIgnoredDuringExecution&＃xff1a;尽量。。。

给节点打上label

kubectl label node k8s-node01 kubernetes.io/e2e-az-name&＃61;e2e-az1
kubectl label node k8s-node02 kubernetes.io/e2e-az-name&＃61;e2e-az2
kubectl label node k8s-node01 another-node-label-key&＃61;another-node-label-value
kubectl label node k8s-master01 another-node-label-key&＃61;another-node-label-value


编辑Deployment

spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/e2e-az-name
operator: In
values:
- e2e-az1
- e2e-az2
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 1
preference:
matchExpressions:
- key: another-node-label-key
operator: In
values:
- another-node-label-value


In&＃xff1a;部署在满足多个条件的节点上

NotIn&＃xff1a;不要部署在满足这些条件的节点上

Exists&＃xff1a;部署在具有某个存在key为指定的值的Node节点上

DoesNotExist&＃xff1a;和Exists相反

Gt&＃xff1a;大于指定的条件&＃xff08;条件为number&＃xff0c;不能为string&＃xff09;

Lt&＃xff1a;小于指定的条件

编辑Deployment&＃xff0c;修改pod亲和性

spec:
affinity:
podAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: region
operator: In
values:
- beijing
topologyKey: kubernetes.io/hostname


编辑Deployment&＃xff0c;修改namspace的pod亲和性

spec:
# 把demo-nginx和kube-system namespace下的符合label为k8s-app&＃61;calico-kube-controllers的Pod部署在同一个节点上&＃xff08;拓扑域&＃xff09;
affinity:
podAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values:
- calico-kube-controllers
# 如果写了namespace的字段&＃xff0c;但是留空&＃xff0c;它是匹配所有namespace下的指定label的Pod&＃xff0c;如果写了namespace并且制定了值&＃xff0c;就是匹配指定namespace下的指定label的Pod。
# 如果没有写namespace&＃xff0c;匹配当前namespace
namespaces:
- kube-system
topologyKey: kubernetes.io/hostname


topologyKey&＃xff1a;拓扑域&＃xff0c;首先说明一点&＃xff0c;不同的key不同的value是属于不同的拓扑域。

kube-system->k8s-app&＃61;calico-kube-controllers

拓扑域划分演示&＃xff1a;

kubectl label node k8s-master01 k8s-node01 jigui&＃61;1
kubectl label node k8s-master02 k8s-node02 jigui&＃61;2
kubectl label node k8s-master03 jigui&＃61;3
kubectl edit deploy demo-nginx
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoreDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- demo-nginx
topologyKey: jigui


扩展到4个pod&＃xff0c;其中3个可以找到部署节点&＃xff0c;最后一个处于pending状态&＃xff0c;因为配置了3个拓扑域&＃xff0c;最后一个找不到部署节点

配置为软亲和力

spec:
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoreDuringExecution:
- weight: 1
podAffinityTerm:
labelSelector:
matchExpressions:
- key: app
operator: In
values:
- demo-nginx
topologyKey: jigui