用节点亲和性把 Pod 分配到节点

原创已于 2025-04-24 11:38:33 修改 · 349 阅读

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#kubernetes #容器 #云原生

于 2025-04-24 11:36:38 首次发布

用节点亲和性把 Pod 分配到节点

你的 Kubernetes 服务器版本必须不低于版本 v1.10. 要获知版本信息，请输入 kubectl version.

1.给节点添加标签

kubectl get nodes --show-labels

输出如下

master1   Ready    control-plane   28d   v1.28.8   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master1,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node.kubernetes.io/exclude-from-external-load-balancers=
worker1   Ready    worker          28d   v1.28.8   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=worker1,kubernetes.io/os=linux,node-role.kubernetes.io/worker=
worker2   Ready    worker          28d   v1.28.8   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=worker2,kubernetes.io/os=linux,node-role.kubernetes.io/worker=

2.创建pod

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  affinity:
    nodeAffinity:
       requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: disktype
            operator: In
            values:
            - ssd 
  containers:
  - name: nginx
    image: registry.cn-hangzhou.aliyuncs.com/devops_de/nginx:latest
    imagePullPolicy: IfNotPresent

创建pod

kubectl apply -f pod-nginx-required-affinity.yaml

3.查看pod调度

[root@master1 pods]# kubectl get pods --output=wide
NAME                   READY   STATUS             RESTARTS        AGE     IP               NODE      NOMINATED NODE   READINESS GATES
command-demo           0/1     Completed          0               2d17h   10.233.103.171   worker2   <none>           <none>
hello-28921126-hjk74   0/1     CrashLoopBackOff   5 (2m39s ago)   5m45s   10.233.103.94    worker2   <none>           <none>
hello-28921127-k4t8x   0/1     CrashLoopBackOff   5 (113s ago)    4m45s   10.233.103.92    worker2   <none>           <none>
hello-28921128-b2sgv   0/1     CrashLoopBackOff   5 (43s ago)     3m45s   10.233.103.89    worker2   <none>           <none>
hello-28921129-nxnnx   0/1     CrashLoopBackOff   4 (81s ago)     2m45s   10.233.103.99    worker2   <none>           <none>
hello-28921130-qt4qk   0/1     CrashLoopBackOff   4 (16s ago)     105s    10.233.103.85    worker2   <none>           <none>
hello-28921131-jbvn2   0/1     Error              3 (31s ago)     45s     10.233.103.97    worker2   <none>           <none>
nginx                  1/1     Running            0               29s     10.233.110.116   worker1   <none>           <none>