18、Kubernetes 调度器 - 调度亲和性

╰+攻爆jí腚メ 2023-07-17 06:28 143阅读 0赞

# 节点亲和性 #

###### pod.spec.nodeAffinity ######

*  ###### preferredDuringSchedulingIgnoredDuringExecution：软策略 ######
 *  ###### requiredDuringSchedulingIgnoredDuringExecution：硬策略 ######

###### requiredDuringSchedulingIgnoredDuringExecution ######

![在这里插入图片描述][2020032012525363.png]

![在这里插入图片描述][20200320125408697.png]

###### preferredDuringSchedulingIgnoredDuringExecution ######

![在这里插入图片描述][2020032012555590.png]

# 合体 #

apiVersion: v1
    kind: Pod
    metadata:
      name: affinity
      labels:
        app: node-affinity-pod
    spec:
      containers:
      - name: with-node-affinity
        image: wangyanglinux/myapp:v1
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/hostname
                operator: NotIn
                values:
                - k8s-node02
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 1
            preference:
              matchExpressions:
              - key: kubernetes.io/hostname
                operator: In
                values:
                - k8s-node01

#### 键值运算关系 ####

*  ###### In：label 的值在某个列表中 ######
 *  ###### NotIn：label 的值不在某个列表中 ######
 *  ###### Gt：label 的值大于某个值 ######
 *  ###### Lt：label 的值小于某个值 ######
 *  ###### Exists：某个 label 存在 ######
 *  ###### DoesNotExist：某个 label 不存在 ######

# Pod 亲和性 #

### pod.spec.affinity.podAffinity/podAntiAffinity ###

*  ###### preferredDuringSchedulingIgnoredDuringExecution：软策略 ######
 *  ###### requiredDuringSchedulingIgnoredDuringExecution：硬策略 ######

apiVersion: v1
    kind: Pod
    metadata:
      name: node01
      labels:
        app: node01
    spec:
      containers:
      - name: node01
        image: wangyanglinux/myapp:v1

![在这里插入图片描述][20200320130136726.png]

apiVersion: v1
    kind: Pod
    metadata:
      name: pod-3
      labels:
        app: pod-3
    spec:
      containers:
      - name: pod-3
        image: wangyanglinux/myapp:v1
      affinity:
        podAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - node01
            topologyKey: kubernetes.io/hostname

![在这里插入图片描述][20200320130335172.png]

###### 将app=node01改成app=node02时，就不能匹配了 ######

![在这里插入图片描述][20200320130730709.png]  
![在这里插入图片描述][20200320130749393.png]  
![在这里插入图片描述][2020032013101148.png]

apiVersion: v1
    kind: Pod
    metadata:
      name: pod-3
      labels:
        app: pod-3
    spec:
      containers:
      - name: pod-3
        image: wangyanglinux/myapp:v1
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 1
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: app
                  operator: In
                  values:
                  - node01
              topologyKey: kubernetes.io/hostname

![在这里插入图片描述][20200320131219673.png]

###### 亲和性/反亲和性调度策略比较如下： ######

<table> 
 <thead> 
  <tr> 
   <th>调度策略</th> 
   <th>匹配标签</th> 
   <th>操作符</th> 
   <th>拓扑域支持</th> 
   <th>调度目标</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>nodeAffinity</td> 
   <td>主机</td> 
   <td>In, NotIn, Exists,DoesNotExist, Gt, Lt</td> 
   <td>否</td> 
   <td>指定主机</td> 
  </tr> 
  <tr> 
   <td>podAffinity</td> 
   <td>POD</td> 
   <td>In, NotIn, Exists,DoesNotExist</td> 
   <td>是</td> 
   <td>POD与指定POD同一拓扑域</td> 
  </tr> 
  <tr> 
   <td>podAnitAffinity</td> 
   <td>POD</td> 
   <td>In, NotIn, Exists,DoesNotExist</td> 
   <td>是</td> 
   <td>POD与指定POD不在同一拓扑域</td> 
  </tr> 
 </tbody> 
</table>

[2020032012525363.png]: /images/20230528/a9037ab41b2140c882213c5589c0cf66.png
[20200320125408697.png]: /images/20230528/d758473808664bbc95a142a75ba4231c.png
[2020032012555590.png]: /images/20230528/6fd95a80ad7b4606ad94b23e10075ed6.png
[20200320130136726.png]: /images/20230528/5a2b1ba322584db1a5536fd73d324703.png
[20200320130335172.png]: /images/20230528/200993d2506146668ed4ed670642b728.png
[20200320130730709.png]: /images/20230528/ebc01555d3e0433795f9ac6be2cd8281.png
[20200320130749393.png]: /images/20230528/5133f8859f644f529c2595206541a67c.png
[2020032013101148.png]: /images/20230528/2968a47be4014c1ab833b10c13c24c6e.png
[20200320131219673.png]: /images/20230528/070dcd037e854a24b54c75fe85603008.png