pod 的亲和性，反亲和性实验

五彩斑斓黑
36 阅读2分钟

1 ,环境准备

node01、 node02 都有标签 test=a，有个pod1 运行在node01上， 标签为app=myapp01

#设置node01和node02节点，拥有标签 test=a
[root@master demo]# kubectl  label nodes node{01,02} test=a --overwrite
node/node01 labeled
node/node02 labeled

#查看拥有标签test=a的节点
[root@master demo]# kubectl  get nodes -l test=a
NAME     STATUS   ROLES    AGE    VERSION
node01   Ready    <none>   7d6h   v1.15.1
node02   Ready    <none>   7d6h   v1.15.1

image-20211108235906881

[root@master demo]# vim test.yaml
apiVersion: v1
kind: Pod
metadata:
  name: myapp01
  labels:
    app: myapp01
spec:
  containers:
  - name: with-node-affinity
    image: soscscs/myapp:v1

#声明式创建pod 
[root@master demo]# kubectl  apply  -f test.yaml 
pod/myapp01 created

#查看pod myapp01的详细信息的标签
[root@master demo]# kubectl  get pods  myapp01  -o wide --show-labels 
NAME      READY   STATUS    RESTARTS   AGE   IP             NODE     NOMINATED NODE   READINESS GATES   LABELS
myapp01   1/1     Running   0          26s   10.244.1.112   node01   <none>           <none>            app=myapp01

image-20211109000202929

2 亲和性+ In 测试

[root@master demo]# vim a.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: myapp10
  labels:
    app: myapp03
spec:
  containers:
  - name: myapp03
    image: soscscs/myapp:v1
  affinity:
    podAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: In
            values:
            - myapp01
        topologyKey: test

pod拥有app=myapp01 标签（设这个pod为x），则把新pod调度到和 pod x 拥有同一个拓扑域test=a 的 节点上。

[root@master demo]# for i in myapp{11..15}; do kubectl apply -f a.yaml; sed -ri "4s#myapp1[0-9]#$i#" a.yaml; done
pod/myapp10 created
pod/myapp11 created
pod/myapp12 created
pod/myapp13 created
pod/myapp14 created
[root@master demo]# kubectl  get pods -o wide --show-labels 
NAME      READY   STATUS    RESTARTS   AGE   IP             NODE     NOMINATED NODE   READINESS GATES   LABELS
myapp01   1/1     Running   0          88m   10.244.1.112   node01   <none>           <none>            app=myapp01
myapp10   1/1     Running   0          6s    10.244.2.104   node02   <none>           <none>            app=myapp03
myapp11   1/1     Running   0          6s    10.244.1.138   node01   <none>           <none>            app=myapp03
myapp12   1/1     Running   0          5s    10.244.2.105   node02   <none>           <none>            app=myapp03
myapp13   1/1     Running   0          5s    10.244.1.139   node01   <none>           <none>            app=myapp03
myapp14   1/1     Running   0          5s    10.244.2.106   node02   <none>           <none>            app=myapp03

image-20211109013002845

因为拓扑域test=a内，已经有了pod存在于node01节点上，所以

3 亲和性+NotIn 测试 

[root@master demo]# vim a.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: myapp10
  labels:
    app: myapp03
spec:
  containers:
  - name: myapp03
    image: soscscs/myapp:v1
  affinity:
    podAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: NotIn
            values:
            - myapp01
        topologyKey: test

[root@master demo]# kubectl delete pod myapp{10..14};for i in myapp{11..15}; do kubectl apply -f a.yaml; sed -ri "4s#myapp1[0-9]#$i#" a.yaml; done
pod "myapp10" deleted
pod "myapp11" deleted
pod "myapp12" deleted
pod "myapp13" deleted
pod "myapp14" deleted
pod/myapp10 created
pod/myapp11 created
pod/myapp12 created
pod/myapp13 created
pod/myapp14 created
[root@master demo]# kubectl  get pods -o wide --show-labels 
NAME      READY   STATUS    RESTARTS   AGE   IP             NODE     NOMINATED NODE   READINESS GATES   LABELS
myapp01   1/1     Running   0          91m   10.244.1.112   node01   <none>           <none>            app=myapp01
myapp10   1/1     Running   0          5s    10.244.1.140   node01   <none>           <none>            app=myapp03
myapp11   1/1     Running   0          5s    10.244.2.107   node02   <none>           <none>            app=myapp03
myapp12   1/1     Running   0          4s    10.244.1.141   node01   <none>           <none>            app=myapp03
myapp13   1/1     Running   0          4s    10.244.2.108   node02   <none>           <none>            app=myapp03
myapp14   1/1     Running   0          4s    10.244.1.142   node01   <none>           <none>            app=myapp03

image-20211109013317371

4 非亲和性+In 测试

[root@master demo]# vim a.yaml
apiVersion: v1
kind: Pod
metadata:
  name: myapp10
  labels:
    app: myapp03
spec:
  containers:
  - name: myapp03
    image: soscscs/myapp:v1
  affinity:
    podAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: In
            values:
            - myapp01
        topologyKey: test

[root@master demo]# kubectl delete pod myapp{10..14};for i in myapp{11..15}; do kubectl apply -f a.yaml; sed -ri "4s#myapp1[0-9]#$i#" a.yaml; done
pod "myapp10" deleted
pod "myapp11" deleted
pod "myapp12" deleted
pod "myapp13" deleted
pod "myapp14" deleted
pod/myapp10 created
pod/myapp11 created
pod/myapp12 created
pod/myapp13 created
pod/myapp14 created
[root@master demo]# kubectl  get pods -o wide --show-labels 
NAME      READY   STATUS    RESTARTS   AGE   IP             NODE     NOMINATED NODE   READINESS GATES   LABELS
myapp01   1/1     Running   0          96m   10.244.1.112   node01   <none>           <none>            app=myapp01
myapp10   0/1     Pending   0          4s    <none>         <none>   <none>           <none>            app=myapp03
myapp11   0/1     Pending   0          3s    <none>         <none>   <none>           <none>            app=myapp03
myapp12   0/1     Pending   0          3s    <none>         <none>   <none>           <none>            app=myapp03
myapp13   0/1     Pending   0          3s    <none>         <none>   <none>           <none>            app=myapp03
myapp14   0/1     Pending   0          3s    <none>         <none>   <none>           <none>            app=myapp03


[root@master demo]# kubectl  describe  pod myapp10

image-20211109013725159

image-20211109013958345

5 非亲和性 + NotIn 测试

[root@master demo]# vim a.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: myapp10
  labels:
    app: myapp03
spec:
  containers:
  - name: myapp03
    image: soscscs/myapp:v1
  affinity:
    podAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: NotIn
            values:
            - myapp01
        topologyKey: test

[root@master demo]# kubectl delete pod myapp{10..14};for i in myapp{11..15}; do kubectl apply -f a.yaml; sed -ri "4s#myapp1[0-9]#$i#" a.yaml; done
pod "myapp10" deleted
pod "myapp11" deleted
pod "myapp12" deleted
pod "myapp13" deleted
pod "myapp14" deleted
pod/myapp10 created
pod/myapp11 created
pod/myapp12 created
pod/myapp13 created
pod/myapp14 created
[root@master demo]# kubectl  get pods -o wide --show-labels 
NAME      READY   STATUS    RESTARTS   AGE    IP             NODE     NOMINATED NODE   READINESS GATES   LABELS
myapp01   1/1     Running   0          102m   10.244.1.112   node01   <none>           <none>            app=myapp01
myapp10   1/1     Running   0          8s     10.244.2.109   node02   <none>           <none>            app=myapp03
myapp11   0/1     Pending   0          8s     <none>         <none>   <none>           <none>            app=myapp03
myapp12   0/1     Pending   0          7s     <none>         <none>   <none>           <none>            app=myapp03
myapp13   0/1     Pending   0          7s     <none>         <none>   <none>           <none>            app=myapp03
myapp14   0/1     Pending   0          7s     <none>         <none>   <none>           <none>            app=myapp03


[root@master demo]# kubectl  describe  pod myapp11

image-20211109014328701

image-20211109014510722

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