【kubevirt】VirtualMachineInstanceReplicaSet(vmis)-扩缩容-弹性伸缩
阅读原文时间:2022年05月03日阅读:1

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目录

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

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