Pod节点调度污点

末蓝、 2022-10-16 06:10 13阅读 0赞

污点：给节点标记污点，影响节点调度，污点值有三种：一定不会被调度、尽量不会调度、一定不会调度并且驱逐该节点已有的pod到其他节点，可以在资源编排文件上配置污点容忍忽略污点。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpYW5nd2VubWFpbA_size_16_color_FFFFFF_t_70][]

# 查看集群节点
    [root@k8smaster ~]# kubectl get nodes
    NAME        STATUS   ROLES    AGE     VERSION
    k8smaster   Ready    master   6h45m   v1.18.0
    k8snode1    Ready    <none>   6h43m   v1.18.0
    k8snode2    Ready    <none>   6h43m   v1.18.0
    
    
    # 查看某个节点的污点
    [root@k8smaster ~]# kubectl describe node k8smaster | grep Taint
    Taints:             node-role.kubernetes.io/master:NoSchedule
    
    # 创建pod
    [root@k8smaster ~]# kubectl create deploy web --image=nginx
    deployment.apps/web created
    
    # 查看pod的详细信息 
    [root@k8smaster ~]# kubectl get pods -o wide
    NAME                   READY   STATUS    RESTARTS   AGE   IP            NODE       NOMINATED NODE   READINESS GATES
    web-5dcb957ccc-rbpb7   1/1     Running   0          43s   10.244.2.10   k8snode2   <none>           <none>
    
    # 查看deployment
    [root@k8smaster ~]# kubectl get deploy
    NAME   READY   UP-TO-DATE   AVAILABLE   AGE
    web    1/1     1            1           106s
    
    # 扩展副本
    [root@k8smaster ~]# kubectl scale deploy web --replicas=10
    deployment.apps/web scaled
    
    # 查看pod详细信息
    [root@k8smaster ~]# kubectl get pods -o wide
    NAME                   READY   STATUS              RESTARTS   AGE   IP            NODE       NOMINATED NODE   READINESS GATES
    web-5dcb957ccc-998xv   1/1     Running             0          49s   10.244.1.7    k8snode1   <none>           <none>
    web-5dcb957ccc-dnvcj   1/1     Running             0          49s   10.244.1.8    k8snode1   <none>           <none>
    web-5dcb957ccc-fz8h6   1/1     Running             0          64s   10.244.2.20   k8snode2   <none>           <none>
    web-5dcb957ccc-jhlvn   1/1     Running             0          49s   10.244.2.22   k8snode2   <none>           <none>
    web-5dcb957ccc-jxw97   1/1     Running             0          49s   10.244.2.21   k8snode2   <none>           <none>
    web-5dcb957ccc-mvjjq   1/1     Running             0          49s   10.244.2.23   k8snode2   <none>           <none>
    web-5dcb957ccc-nk2ft   1/1     Running             0          49s   10.244.1.6    k8snode1   <none>           <none>
    web-5dcb957ccc-ns8zb   0/1     ContainerCreating   0          49s   <none>        k8snode1   <none>           <none>
    web-5dcb957ccc-v9qhf   0/1     ContainerCreating   0          49s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-wz2w7   0/1     ContainerCreating   0          49s   <none>        k8snode1   <none>           <none>
    
    # 给k8snode1添加污点
    [root@k8smaster ~]# kubectl taint node k8snode1 env_role=yes:NoSchedule
    node/k8snode1 tainted
    
    # 查看污点
    [root@k8smaster ~]# kubectl describe node k8snode1 | grep Taint
    Taints:             env_role=yes:NoSchedule
    
    # 删除deploy 
    [root@k8smaster ~]# kubectl get deploy
    NAME   READY   UP-TO-DATE   AVAILABLE   AGE
    web    10/10   10           10          4m7s
    
    [root@k8smaster ~]# kubectl delete deploy web
    deployment.apps "web" deleted
    
    # 创建deploy  进行扩容 查看节点调度
    [root@k8smaster ~]# kubectl create deploy web --image=nginx
    deployment.apps/web created
    
    [root@k8smaster ~]# kubectl scale deploy web --replicas=10
    deployment.apps/web scaled
    
    [root@k8smaster ~]# kubectl get pod -o wide
    NAME                   READY   STATUS              RESTARTS   AGE   IP            NODE       NOMINATED NODE   READINESS GATES
    web-5dcb957ccc-2k6xd   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-5cs8f   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-6z67v   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-79qpz   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-9jwn8   1/1     Running             0          50s   10.244.2.25   k8snode2   <none>           <none>
    web-5dcb957ccc-bsk74   1/1     Running             0          25s   10.244.2.26   k8snode2   <none>           <none>
    web-5dcb957ccc-k7mnn   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-tpkg4   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-wq2ds   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>
    web-5dcb957ccc-z7khb   0/1     ContainerCreating   0          25s   <none>        k8snode2   <none>           <none>

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