nodeSelector调度

1.查看节点的label

student@ubuntu:~/schedule$kubectl get node --show-labels
NAME       STATUS   ROLES    AGE     VERSION   LABELS
node-193   Ready    worker   7d18h   v1.12.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/fluentd-ds-ready=true,beta.kubernetes.io/os=linux,kubernetes.io/hostname=node-193,node-role.kubernetes.io/worker=,status=other
ubuntu     Ready    master   7d19h   v1.12.1   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/fluentd-ds-ready=true,beta.kubernetes.io/os=linux,key=value,kubernetes.io/hostname=ubuntu,node-role.kubernetes.io/master=,status=vip

2.创建基于nodeselector的pod

student@ubuntu:~/schedule$cat schedule_by_nodeselector.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: node-selector
spec:
  containers:
  - name: busybox
    image: busybox
    command:
    - /bin/sleep
    - ”10000“
  nodeSelector:
    kubernetes.io/hostname: ubuntu

student@ubuntu:~/schedule$kubectl create -f schedule_by_nodeselector.yaml 
pod/node-selector created

3. 查看pod的分布

student@ubuntu:~/schedule$kubectl get pod -o wide
NAME            READY   STATUS    RESTARTS   AGE    IP              NODE     NOMINATED NODE
node-selector   1/1     Running   0          2m5s   192.168.0.238   ubuntu   <none>

使用taint控制调度

1. NoSchedule

student@ubuntu:~/schedule$kubectl taint node ubuntu Taint=true:NoSchedule
node/ubuntu tainted

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx
  labels:
    run: nginx
    name: nginx
spec:
  replicas: 4
  selector:
    matchLabels:
      run: nginx
  template:
    metadata:
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx

student@ubuntu:~/schedule$kubectl create -f schedule_by_taint.yaml 
deployment.extensions/nginx created

student@ubuntu:~/schedule$kubectl get pod -o wide
NAME                    READY   STATUS              RESTARTS   AGE   IP              NODE       NOMINATED NODE
nginx-dbddb74b8-rvqgs   0/1     ContainerCreating   0          18s   <none>          node-193   <none>
nginx-dbddb74b8-t7wt6   1/1     Running             0          18s   192.168.1.188   node-193   <none>
nginx-dbddb74b8-v62f9   1/1     Running             0          18s   192.168.1.187   node-193   <none>
nginx-dbddb74b8-w4djm   1/1     Running             0          18s   192.168.1.186   node-193   <none>

2.NoExecute

student@ubuntu:~/schedule$kubectl taint node node-193 Taint=true:NoExecute

student@ubuntu:~/schedule$kubectl get pod -o wide
NAME                    READY   STATUS        RESTARTS   AGE    IP       NODE       NOMINATED NODE
nginx-dbddb74b8-5nns7   0/1     Pending       0          5s     <none>   <none>     <none>
nginx-dbddb74b8-79nj7   0/1     Pending       0          5s     <none>   <none>     <none>
nginx-dbddb74b8-8kkjt   0/1     Pending       0          5s     <none>   <none>     <none>
nginx-dbddb74b8-pmtm8   0/1     Pending       0          5s     <none>   <none>     <none>
nginx-dbddb74b8-rvqgs   0/1     Terminating   0          100s   <none>   node-193   <none>
nginx-dbddb74b8-w4djm   0/1     Terminating   0          100s   <none>   node-193   <none>

3.Tolerations

student@ubuntu:~/schedule$kubectl edit deployments. nginx

      tolerations:
      - effect: NoExecute
        key: Taint
        operator: Equal

student@ubuntu:~/schedule$kubectl get pod -o wide
NAME                     READY   STATUS    RESTARTS   AGE   IP              NODE       NOMINATED NODE
nginx-7df76f4cbc-7xkcv   1/1     Running   0          51s   192.168.1.190   node-193   <none>
nginx-7df76f4cbc-fp5md   1/1     Running   0          41s   192.168.1.193   node-193   <none>
nginx-7df76f4cbc-kgxj6   1/1     Running   0          51s   192.168.1.191   node-193   <none>
nginx-7df76f4cbc-xj8tq   1/1     Running   0          45s   192.168.1.192   node-193   <none>

student@ubuntu:~/schedule$kubectl edit deployments. nginx 
      tolerations:
      - effect: NoSchedule
        key: Taint
        operator: Equal
        value: "true"
student@ubuntu:~/schedule$kubectl get pod -o wide
NAME                     READY   STATUS        RESTARTS   AGE    IP              NODE       NOMINATED NODE
nginx-567778bb4f-8rgvk   1/1     Running       0          12s    192.168.0.243   ubuntu     <none>
nginx-567778bb4f-lcxld   1/1     Running       0          21s    192.168.0.241   ubuntu     <none>
nginx-567778bb4f-pvd7g   1/1     Running       0          21s    192.168.0.240   ubuntu     <none>
nginx-567778bb4f-t5nkd   1/1     Running       0          16s    192.168.0.242   ubuntu     <none>

使用nodeaffinity调度

使用podaffinity调度