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目录

• 概述/理解
• 使用场景
• 创建vmis
  • 扩缩容
  • 弹性伸缩
    • 方法1
    • 方法2

VirtualMachineInstanceReplicaSet（vmis）确保指定数量的 VirtualMachineInstance（vmi） 副本在任何时候都在运行。

我们可以这样理解，vmis就是kubernetes（k8s）里面的控制器（DeployMent，ReplicaSet）管理我们pod的副本数，实现扩缩容、回滚等。也可以借助HorizontalPodAutoscaler（hpa）实现弹性伸缩。这里我们就说vmis控制器，在这里的vmis控制器，管理我们vmi虚拟机实例的副本数，也可以实现扩缩容，借助hpa实现弹性伸缩。所有我们的yaml文件写法原理都类似。

当需要许多相同的虚拟机，并且不关心在虚拟机终止后任何磁盘状态时。

1. 编写vmis的yaml文件

   [root@master vm]# cat vmis.yaml
   apiVersion: kubevirt.io/v1alpha3
   kind: VirtualMachineInstanceReplicaSet
   metadata:
   name: testreplicaset
   spec:
   replicas: 2
   selector:
   matchLabels:
   myvmi: myvmi # 保持一致，选择
   template:
   metadata:
   labels:
   myvmi: myvmi # 保持一致，匹配
   spec:
   domain:
   devices:
   disks:
   - name: containerdisk
   disk:
   bus: virtio
   resources:
   requests:
   memory: 1024M
   volumes:
   - name: containerdisk
   containerDisk:
   image: centos7
   imagePullPolicy: IfNotPresent

2. 使用kubectl命令创建vmis

   [root@master vm]# kubectl apply -f vmis.yaml
   virtualmachineinstancereplicaset.kubevirt.io/testreplicaset created

3. 查看运行状态

   [root@master vm]# kubectl get vmis
   NAME AGE PHASE IP NODENAME READY
   testreplicaset6vm9s 42s Running 10.244.0.139 master False
   testreplicaset8dshm 22s Scheduling False
   testreplicasetbqxnb 22s Scheduling False
   [root@master vm]# kubectl get vmis
   NAME AGE PHASE IP NODENAME READY
   testreplicaset8dshm 46s Running 10.244.0.141 master False
   testreplicasetbqxnb 46s Running 10.244.0.140 master False
   [root@master vm]# kubectl get pod
   NAME READY STATUS RESTARTS AGE
   virt-launcher-testreplicaset8dshm-nz7x2 2/2 Running 0 69s
   virt-launcher-testreplicasetbqxnb-ljp2f 2/2 Running 0 70s

4. describe 查看详细信息

   [root@master vm]# kubectl describe vmirs testreplicaset
   Name: testreplicaset
   Namespace: default
   Labels:
   Annotations: kubevirt.io/latest-observed-api-version: v1
   kubevirt.io/storage-observed-api-version: v1alpha3
   API Version: kubevirt.io/v1
   Kind: VirtualMachineInstanceReplicaSet
   Metadata:
   Creation Timestamp: 2022-05-02T13:50:05Z
   Generation: 2
   Managed Fields:
   API Version: kubevirt.io/v1alpha3
   Fields Type: FieldsV1
   fieldsV1:
   f:metadata:
   f:annotations:
   f:kubevirt.io/latest-observed-api-version:
   f:kubevirt.io/storage-observed-api-version:
   f:spec:
   f:template:
   f:metadata:
   f:creationTimestamp:
   f:status:
   .:
   f:labelSelector:
   f:replicas:
   Manager: Go-http-client
   Operation: Update
   Time: 2022-05-02T13:50:05Z
   API Version: kubevirt.io/v1alpha3
   Fields Type: FieldsV1
   fieldsV1:
   f:metadata:
   f:annotations:
   …
   …
   .:
   f:memory:
   f:volumes:
   Manager: kubectl
   Operation: Update
   Time: 2022-05-02T13:50:05Z
   Resource Version: 267261
   Self Link: /apis/kubevirt.io/v1/namespaces/default/virtualmachineinstancereplicasets/testreplicaset
   UID: 96d17d12-17b5-4df7-940a-fac7c6b820d2
   Spec:
   Replicas: 2
   Selector:
   Match Labels:
   Myvmi: myvmi
   Template:
   Metadata:
   Creation Timestamp:
   Labels:
   Myvmi: myvmi
   Spec:
   Domain:
   Devices:
   Disks:
   Disk:
   Bus: virtio
   Name: containerdisk
   Resources:
   Requests:
   Memory: 1024M
   Volumes:
   Container Disk:
   Image: kubevirt/cirros-container-disk-demo
   Image Pull Policy: IfNotPresent
   Name: containerdisk
   Status:
   Label Selector: myvmi=myvmi
   Replicas: 2
   Events:
   Type Reason Age From Message
   ---- ------ ---- ---- -------
   Normal SuccessfulCreate 5m21s virtualmachinereplicaset-controller Started the virtual machine by creating the new virtual machine instance testreplicaseth6zsl
   Normal SuccessfulCreate 5m21s virtualmachinereplicaset-controller Started the virtual machine by creating the new virtual machine instance testreplicasetw75s4

扩缩容

1. 查看vmis

   [root@master vm]# kubectl get -f vmis.yaml
   NAME DESIRED CURRENT READY AGE
   testreplicaset 3 3 2m52s

2. 使用scale命令，设置副本数为5

   [root@master vm]# kubectl scale vmirs testreplicaset --replicas 5
   virtualmachineinstancereplicaset.kubevirt.io/testreplicaset scaled

3. 查看效果

   [root@master vm]# kubectl get vmis
   NAME AGE PHASE IP NODENAME READY
   testreplicaset98x8d 5m29s Running 10.244.0.146 master False
   testreplicasetddqc9 2m24s Running 10.244.0.148 master False
   testreplicasetdss8l 5m29s Running 10.244.0.144 master False
   testreplicasetmhm6x 5m29s Running 10.244.0.145 master False
   testreplicasetv4dzs 2m24s Running 10.244.0.147 master False

   [root@master vm]# kubectl get pod
   NAME READY STATUS RESTARTS AGE
   virt-launcher-testreplicaset98x8d-5p99p 2/2 Running 0 3m15s
   virt-launcher-testreplicasetddqc9-6c2m4 2/2 Running 0 10s
   virt-launcher-testreplicasetdss8l-9mv56 2/2 Running 0 3m15s
   virt-launcher-testreplicasetmhm6x-r76wt 2/2 Running 0 3m15s
   virt-launcher-testreplicasetv4dzs-bm4s8 2/2 Running 0 10s

弹性伸缩

方法1

1. 使用Horizo​​ntal Pod Autoscaler（hpa），创建yaml文件

   [root@master vm]# cat vmis-hpa.yaml
   apiVersion: autoscaling/v1
   kind: HorizontalPodAutoscaler
   metadata:
   creationTimestamp: null
   name: testreplicaset
   spec:
   maxReplicas: 5
   minReplicas: 2
   scaleTargetRef:
   apiVersion: kubevirt.io/v1
   kind: VirtualMachineInstanceReplicaSet
   name: testreplicaset

2. 创建vmis-hpa

   [root@master vm]# kubectl apply -f vmis-hpa.yaml
   horizontalpodautoscaler.autoscaling/testreplicaset created

3. 查看状态

   [root@master vm]# kubectl get hpa
   NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
   testreplicaset VirtualMachineInstanceReplicaSet/testreplicaset /80% 2 5 0 7s

方法2

1. 使用kubectl autoscale命令

   [root@master vm]# kubectl autoscale vmirs testreplicaset --min=2 --max=5