@TOC
概述 / 了解
VirtualMachineInstanceReplicaSet（vmis）确保指定数量的 VirtualMachineInstance（vmi）正本在任何时候都在运行。
咱们能够这样了解，vmis 就是 kubernetes（k8s）外面的控制器（DeployMent，ReplicaSet）治理咱们 pod 的正本数，实现扩缩容、回滚等。也能够借助 HorizontalPodAutoscaler（hpa）实现弹性伸缩。这里咱们就说 vmis 控制器，在这里的 vmis 控制器，治理咱们 vmi 虚拟机实例的正本数，也能够实现扩缩容，借助 hpa 实现弹性伸缩。所有咱们的 yaml 文件写法原理都相似。
应用场景
当须要许多雷同的虚拟机，并且不关怀在虚拟机终止后任何磁盘状态时。
创立 vmis
-
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，抉择 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 -
应用 kubectl 命令创立 vmis
[root@master vm]# kubectl apply -f vmis.yaml virtualmachineinstancereplicaset.kubevirt.io/testreplicaset created -
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 - describe 查看详细信息
[root@master vm]# kubectl describe vmirs testreplicaset
Name: testreplicaset
Namespace: default
Labels: <none>
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: <nil>
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
-
查看 vmis
[root@master vm]# kubectl get -f vmis.yaml NAME DESIRED CURRENT READY AGE testreplicaset 3 3 2m52s -
应用 scale 命令，设置正本数为 5
[root@master vm]# kubectl scale vmirs testreplicaset --replicas 5 virtualmachineinstancereplicaset.kubevirt.io/testreplicaset scaled - 查看成果
[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
办法 1
-
应用 Horizontal Pod Autoscaler（hpa），创立 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 -
创立 vmis-hpa
[root@master vm]# kubectl apply -f vmis-hpa.yaml horizontalpodautoscaler.autoscaling/testreplicaset created - 查看状态
[root@master vm]# kubectl get hpa
NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
testreplicaset VirtualMachineInstanceReplicaSet/testreplicaset <unknown>/80% 2 5 0 7s办法 2
- 应用
kubectl autoscale命令
[root@master vm]# kubectl autoscale vmirs testreplicaset --min=2 --max=5