Affinity

kaidi
k8s
2024-08-04
53热度
0评论

Affinity亲和力

NodeAffinity：节点亲和力

PreferredDuringSchedulingIgnoredDuringExecution：软亲和力，尽量部署在满足条件的节点上，或者是尽量不要部署在被匹配的节点。

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deploy-with-node-affinity
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      name: myapp-pod
      labels:
        app: myapp
    spec:
      affinity:
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 60
            preference:
              matchExpressions:
              - {key: zone, operator: In, values: ["foo"]}
          - weight: 30
            preference:
              matchExpressions:
              - {key: ssd, operator: Exists, values: []}
      containers:
      - name: myapp
        image: chenkaidi/myapp:v1

RequiredDuringSchedulingIgnoredDuringExecution：硬亲和力，即支持必须部署在指定的节点上，也支持必须不部署在指定的节点上。

apiVersion: v1
kind: Pod
metadata:
  name: with-required-nodeaffinity-1
spec:
  affinity:
    nodeAffinity: 
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - {key: zone, operator: In, values: ["foo"]}
  containers:
  - name: myapp
    image: chenkaidi/myapp:v1

apiVersion: v1
kind: Pod
metadata:
  name: with-required-nodeaffinity-2
spec:
  affinity:
    nodeAffinity: 
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - {key: zone, operator: In, values: ["foo", "bar"]}
          - {key: ssd, operator: Exists, values: []}
  containers:
  - name: myapp
    image: chenkaidi/myapp:v1

apiVersion: v1
kind: Pod
metadata:
  name: with-required-nodeaffinity-3
spec:
  affinity:
    nodeAffinity: 
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - {key: zone, operator: In, values: ["foo", "bar"]}
          - {key: ssd, operator: Exists, values: []}
  containers:
  - name: myapp
    image: chenkaidi/myapp:v1
    resources:
      requests:
        cpu: 1
        memory: 2Gi

PodAffinity：Pod亲和力

RequiredDuringSchedulingIgnoredDuringExecution：将A应用和B应用部署在一块

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-with-pod-affinity
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      name: myapp
      labels:
        app: myapp
    spec:
      affinity:
        podAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - {key: app, operator: In, values: ["db"]}
            topologyKey: zone
      containers:
      - name: myapp
        image: chenkaidi/myapp:v1

PreferredDuringSchedulingIgnoredDuringExecution：尽量将A应用和B应用部署在一块

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-with-preferred-pod-affinity
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      name: myapp
      labels:
        app: myapp
    spec:
      affinity:
        podAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 80
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - {key: app, operator: In, values: ["db"]}
              topologyKey: rack
          - weight: 20
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - {key: app, operator: In, values: ["db"]}
              topologyKey: zone
      containers:
      - name: myapp
        image: chenkaidi/myapp:v1

PodAntiAffinity：Pod反亲和力

RequiredDuringSchedulingIgnoredDuringExecution：不要将A应用与与之匹配的应用部署在一块

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-with-pod-anti-affinity
spec:
  replicas: 4
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      name: myapp
      labels:
        app: myapp
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app 
                operator: In
                values:
                - myapp
            topologyKey: kubernetes.io/hostname
      containers:
      - name: myapp
        image: chenkaidi/myapp:v1

PreferredDuringSchedulingIgnoredDuringExecution：尽量不要将A应用与与之匹配的应用部署在一块

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-server
spec:
  selector:
    matchLabels:
      app: web-store
  replicas: 3
  template:
    metadata:
      labels:
        app: web-store
    spec:
      affinity:
        podAntiAffinity: #反亲和性
          preferredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - web-store
            topologyKey: "kubernetes.io/hostname"
      containers:
      - name: web-app
        image: nginx:1.12-alpine