Kubernetes使用lable调度pod到指定节点

 云计算, 容器化  Add comments
4月 272020
 

获取当前集群pod列表及所属节点

[root@k8s01 ~]# kubectl get pods -o wide
NAME                               READY   STATUS    RESTARTS   AGE     IP            NODE    NOMINATED NODE   READINESS GATES
nginx-deployment-bbfdbf4b7-8khd4   1/1     Running   0          3d23h   10.244.2.35   k8s03   <none>           <none>
nginx-deployment-bbfdbf4b7-9g825   1/1     Running   0          3d23h   10.244.1.17   k8s02   <none>           <none>
nginx-deployment-bbfdbf4b7-hsvfg   1/1     Running   0          3d23h   10.244.2.36   k8s03   <none>           <none>
nginx-deployment-bbfdbf4b7-jpt96   1/1     Running   0          3d23h   10.244.2.34   k8s03   <none>           <none>
nginx-deployment-bbfdbf4b7-vlnlk   1/1     Running   0          3d23h   10.244.1.18   k8s02   <none>           <none>
[root@k8s01 ~]# kubectl get deployments
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   5/5     5            5           5d15h
[root@k8s01 ~]#

删除nginx-deployment资源

[root@k8s01 ~]# kubectl delete deployments.apps nginx-deployment 
deployment.apps "nginx-deployment" deleted
[root@k8s01 ~]# kubectl get pods
No resources found in default namespace.
[root@k8s01 ~]#

获取节点列表

[root@k8s01 ~]# kubectl get nodes
NAME    STATUS   ROLES    AGE     VERSION
k8s01   Ready    master   6d15h   v1.18.2
k8s02   Ready    <none>   6d15h   v1.18.2
k8s03   Ready    <none>   6d15h   v1.18.2
k8s04   Ready    <none>   3d23h   v1.18.2
k8s05   Ready    <none>   3d23h   v1.18.2
[root@k8s01 ~]#

应用nginx-deployment配置文件

[root@k8s01 ~]# cat nginx-deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.17.10
        ports:
        - containerPort: 80
[root@k8s01 ~]# kubectl apply -f nginx-deployment.yaml 
deployment.apps/nginx-deployment created
[root@k8s01 ~]# kubectl get pods -o wide
NAME                               READY   STATUS    RESTARTS   AGE   IP            NODE    NOMINATED NODE   READINESS GATES
nginx-deployment-cc5db57d4-dvr4p   1/1     Running   0          11s   10.244.2.37   k8s03   <none>           <none>
nginx-deployment-cc5db57d4-fnq9c   1/1     Running   0          11s   10.244.3.2    k8s04   <none>           <none>
[root@k8s01 ~]#

获取节点的默认标签配置信息

[root@k8s01 ~]# kubectl get nodes --show-labels 
NAME    STATUS   ROLES    AGE     VERSION   LABELS
k8s01   Ready    master   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s01,kubernetes.io/os=linux,node-role.kubernetes.io/master=
k8s02   Ready    <none>   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s02,kubernetes.io/os=linux
k8s03   Ready    <none>   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s03,kubernetes.io/os=linux
k8s04   Ready    <none>   3d23h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s04,kubernetes.io/os=linux
k8s05   Ready    <none>   3d23h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s05,kubernetes.io/os=linux
[root@k8s01 ~]#

对指定节点添加标签键值对

[root@k8s01 ~]# kubectl label nodes k8s05 disktype=ssd
node/k8s05 labeled
[root@k8s01 ~]# kubectl get nodes --show-labels 
NAME    STATUS   ROLES    AGE     VERSION   LABELS
k8s01   Ready    master   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s01,kubernetes.io/os=linux,node-role.kubernetes.io/master=
k8s02   Ready    <none>   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s02,kubernetes.io/os=linux
k8s03   Ready    <none>   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s03,kubernetes.io/os=linux
k8s04   Ready    <none>   3d23h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s04,kubernetes.io/os=linux
k8s05   Ready    <none>   3d23h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disktype=ssd,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s05,kubernetes.io/os=linux
[root@k8s01 ~]#

修改deployment配置文件添加关联标签

[root@k8s01 ~]# vi nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 6
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.17.10
        ports:
        - containerPort: 80
      nodeSelector:
        disktype: ssd

应用配置文件执行销毁原有pod并调度新pod资源到节点k8s05上

[root@k8s01 ~]# kubectl get pods -o wide
NAME                               READY   STATUS              RESTARTS   AGE     IP            NODE    NOMINATED NODE   READINESS GATES
nginx-deployment-cc5db57d4-5lzsz   1/1     Running             0          12s     10.244.3.3    k8s04   <none>           <none>
nginx-deployment-cc5db57d4-dvr4p   1/1     Running             0          9m53s   10.244.2.37   k8s03   <none>           <none>
nginx-deployment-cc5db57d4-fnq9c   1/1     Running             0          9m53s   10.244.3.2    k8s04   <none>           <none>
nginx-deployment-cc5db57d4-hwmk4   1/1     Running             0          12s     10.244.1.19   k8s02   <none>           <none>
nginx-deployment-cc5db57d4-qt26r   1/1     Running             0          12s     10.244.2.38   k8s03   <none>           <none>
nginx-deployment-ddc6847d-4qx2m    0/1     ContainerCreating   0          12s     <none>        k8s05   <none>           <none>
nginx-deployment-ddc6847d-cvhv4    0/1     ContainerCreating   0          12s     <none>        k8s05   <none>           <none>
nginx-deployment-ddc6847d-dcztn    0/1     ContainerCreating   0          12s     <none>        k8s05   <none>           <none>
[root@k8s01 ~]# kubectl get pods -o wide
NAME                               READY   STATUS        RESTARTS   AGE   IP            NODE    NOMINATED NODE   READINESS GATES
nginx-deployment-cc5db57d4-dvr4p   0/1     Terminating   0          10m   10.244.2.37   k8s03   <none>           <none>
nginx-deployment-cc5db57d4-fnq9c   0/1     Terminating   0          10m   10.244.3.2    k8s04   <none>           <none>
nginx-deployment-ddc6847d-26hl9    1/1     Running       0          13s   10.244.5.7    k8s05   <none>           <none>
nginx-deployment-ddc6847d-4qx2m    1/1     Running       0          26s   10.244.5.3    k8s05   <none>           <none>
nginx-deployment-ddc6847d-cvhv4    1/1     Running       0          26s   10.244.5.4    k8s05   <none>           <none>
nginx-deployment-ddc6847d-d6f99    1/1     Running       0          14s   10.244.5.6    k8s05   <none>           <none>
nginx-deployment-ddc6847d-dcztn    1/1     Running       0          26s   10.244.5.5    k8s05   <none>           <none>
nginx-deployment-ddc6847d-dj5x4    1/1     Running       0          12s   10.244.5.8    k8s05   <none>           <none>
[root@k8s01 ~]# kubectl get pods -o wide
NAME                              READY   STATUS    RESTARTS   AGE   IP           NODE    NOMINATED NODE   READINESS GATES
nginx-deployment-ddc6847d-26hl9   1/1     Running   0          21s   10.244.5.7   k8s05   <none>           <none>
nginx-deployment-ddc6847d-4qx2m   1/1     Running   0          34s   10.244.5.3   k8s05   <none>           <none>
nginx-deployment-ddc6847d-cvhv4   1/1     Running   0          34s   10.244.5.4   k8s05   <none>           <none>
nginx-deployment-ddc6847d-d6f99   1/1     Running   0          22s   10.244.5.6   k8s05   <none>           <none>
nginx-deployment-ddc6847d-dcztn   1/1     Running   0          34s   10.244.5.5   k8s05   <none>           <none>
nginx-deployment-ddc6847d-dj5x4   1/1     Running   0          20s   10.244.5.8   k8s05   <none>           <none>
[root@k8s01 ~]#

删除lable标签配置

[root@k8s01 ~]# kubectl label nodes k8s05 disktype-
node/k8s05 labeled
[root@k8s01 ~]# kubectl get nodes --show-labels 
NAME    STATUS   ROLES    AGE     VERSION   LABELS
k8s01   Ready    master   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s01,kubernetes.io/os=linux,node-role.kubernetes.io/master=
k8s02   Ready    <none>   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s02,kubernetes.io/os=linux
k8s03   Ready    <none>   6d15h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s03,kubernetes.io/os=linux
k8s04   Ready    <none>   3d23h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s04,kubernetes.io/os=linux
k8s05   Ready    <none>   3d23h   v1.18.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s05,kubernetes.io/os=linux
[root@k8s01 ~]#

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