本文介绍
本文有两个版本，详细版、简洁版。
前者适合新手，后者适合老手（方便大家查找，从而过滤掉某些步骤，节约时间成本） 所以大家按需查看哟。
简洁版：包含所有步骤，以及命令的执行过程（适合新手）
简洁版：只包含命令（适合有一定熟练度的人）
前言
- 什么是kubevirt？
kubevirt是一个容器方式运行虚拟机的项目。
kubevirt是附加kubernetes集群上的，它是通过CustomResourceDefinition（CRD）部署到Kubernetes API变成资源对象。使用方式类似创建deploy、pod......这些资源清单。
环境准备
- 环境保证网络出外网
| 系统 | 服务 |
|---|---|
| centos7 | kubernetes集群 |
官网地址：https://kubevirt.io/
详细版
搭建步骤
安装KubeVirt
[root@master ~]# export RELEASE=v0.35.0
[root@master ~]# kubectl apply -f https://github.com/kubevirt/kubevirt/releases/download/${RELEASE}/kubevirt-operator.yaml
[root@master ~]# kubectl apply -f https://github.com/kubevirt/kubevirt/releases/download/${RELEASE}/kubevirt-cr.yaml
[root@master ~]# kubectl get pods -n kubevirt
NAME READY STATUS RESTARTS AGE
virt-api-64999f7bf5-fblkh 1/1 Running 0 5m24s
virt-api-64999f7bf5-l8wzr 1/1 Running 0 5m24s
virt-controller-8696ccdf44-k9qpv 1/1 Running 0 4m52s
virt-controller-8696ccdf44-tpxwp 1/1 Running 0 4m52s
virt-handler-kl8tl 1/1 Running 0 4m52s
virt-operator-78fbcdfdf4-468h4 1/1 Running 0 8m4s
virt-operator-78fbcdfdf4-nvvxx 1/1 Running 0 8m4s所以服务启动后，执行下面这条命令
[root@master ~]# kubectl -n kubevirt wait kv kubevirt --for condition=Available
kubevirt.kubevirt.io/kubevirt condition met安装virtctl客户端工具
[root@master ~]# export VERSION=v0.41.0
[root@master ~]# wget https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/virtctl-${VERSION}-linux-amd64
[root@master kubevirt]# cp virtctl-v0.41.0-linux-amd64 /usr/local/bin/virtctl
[root@master kubevirt]# chmod +x /usr/local/bin/virtctl ; ll /usr/local/bin/
total 64000
-r-xr-xr-x. 1 root root 17586312 Jan 11 10:52 docker-compose
-rwxr-xr-x. 1 root root 47944250 Apr 16 16:58 virtctl
[root@master kubevirt]# virtctl version
Client Version: version.Info{GitVersion:"v0.41.0", GitCommit:"b77b858ac9345ae6858cf409e1833f4548ec2809", GitTreeState:"clean", BuildDate:"2020-11-09T13:38:36Z", GoVersion:"go1.13.14", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{GitVersion:"{gitVersion}", GitCommit:"{gitCommit}", GitTreeState:"{gitTreeState}", BuildDate:"{buildDate}", GoVersion:"go1.13.14", Compiler:"gc", Platform:"linux/amd64"}创建VirtualMachine
VirtualMachine(vm)类似于docker镜像一个模板可以启动很多运行实例vmi：
[root@master kubevirt]# cat test.yaml
apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
metadata:
labels:
kubevirt.io/vm: vm-cirros
name: vm-cirros
spec:
running: false
template:
metadata:
labels:
kubevirt.io/vm: vm-cirros
spec:
domain:
devices:
disks:
- disk:
bus: virtio
name: containerdisk
- disk:
bus: virtio
name: cloudinitdisk
machine:
type: ""
resources:
requests:
memory: 64M
terminationGracePeriodSeconds: 0
volumes:
- name: containerdisk
containerDisk:
image: kubevirt/cirros-container-disk-demo:latest
- cloudInitNoCloud:
userDataBase64: IyEvYmluL3NoCgplY2hvICdwcmludGVkIGZyb20gY2xvdWQtaW5pdCB1c2VyZGF0YScK
name: cloudinitdisk
[root@master kubevirt]# kubectl apply -f test.yaml
virtualmachine.kubevirt.io/vm-cirros created
[root@master kubevirt]# kubectl get vm
NAME AGE VOLUME
vm-cirros 21m启动VirtualMachineInstance
VirtualMachineInstance（vmi）类似于docker镜像的运行实例容器：
[root@master kubevirt]# virtctl start vm-cirros
VM vm-cirros was scheduled to start
[root@master kubevirt]# kubectl get vmi
NAME AGE PHASE IP NODENAME
vm-cirros 62s Running 10.244.0.15 master
[root@master kubevirt]# virtctl console vm-cirros # 进入虚拟机
Successfully connected to vm-cirros console. The escape sequence is ^]
login as 'cirros' user. default password: 'gocubsgo'. use 'sudo' for root.
vm-cirros login: cirros
Password:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc pfifo_fast qlen 1000
link/ether 2e:3e:2a:46:29:94 brd ff:ff:ff:ff:ff:ff
inet 10.244.0.16/24 brd 10.244.0.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::2c3e:2aff:fe46:2994/64 scope link tentative flags 08
valid_lft forever preferred_lft forever
$ # 按 ctrl+] 退出虚拟机
$ [root@master kubevirt]#启动和停止命令
spec.running 字段如果设置为true为启动、false为停止**
- 创建
VirtualMachine后，可以像这样打开或关闭它：
# Start the virtual machine: 启动虚拟机
virtctl start vm
# Stop the virtual machine: 停止虚拟机
virtctl stop vmkubectl也可以使用：
# Start the virtual machine: 启动虚拟机
kubectl patch virtualmachine vm --type merge -p \
'{"spec":{"running":true}}'
# Stop the virtual machine: 停止虚拟机
kubectl patch virtualmachine vm --type merge -p \
'{"spec":{"running":false}}'vm作为服务公开
VirtualMachine 可以作为服务公开。实际服务将在 VirtualMachineInstance 启动后可用。
例如， 在创建 VirtualMachine 后，将 SSH 端口 (22) 公开为NodePort服务
[root@master kubevirt]# virtctl expose virtualmachine vm-cirros --name vmiservice-node --target-port 22 --port 24 --type NodePort
Service vmiservice-node successfully exposed for virtualmachine vm-cirros
[root@master kubevirt]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 95d
vmiservice-node NodePort 10.106.62.191 <none> 24:31912/TCP 3s最后使用远程工具连接即可：
注意 端口使用svc NodePort端口**，如图所示：
简洁版
安装KubeVirt
export RELEASE=v0.35.0
kubectl apply -f https://github.com/kubevirt/kubevirt/releases/download/${RELEASE}/kubevirt-operator.yaml
kubectl apply -f https://github.com/kubevirt/kubevirt/releases/download/${RELEASE}/kubevirt-cr.yaml
kubectl get pods -n kubevirtkubectl -n kubevirt wait kv kubevirt --for condition=Available安装virtctl客户端工具
export VERSION=v0.41.0
wget https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/virtctl-${VERSION}-linux-amd64
cp virtctl-v0.41.0-linux-amd64 /usr/local/bin/virtctl
chmod +x /usr/local/bin/virtctl ; ll /usr/local/bin/
virtctl version创建VirtualMachine
[root@master kubevirt]# cat test.yaml
apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
metadata:
labels:
kubevirt.io/vm: vm-cirros
name: vm-cirros
spec:
running: false
template:
metadata:
labels:
kubevirt.io/vm: vm-cirros
spec:
domain:
devices:
disks:
- disk:
bus: virtio
name: containerdisk
- disk:
bus: virtio
name: cloudinitdisk
machine:
type: ""
resources:
requests:
memory: 64M
terminationGracePeriodSeconds: 0
volumes:
- name: containerdisk
containerDisk:
image: kubevirt/cirros-container-disk-demo:latest
- cloudInitNoCloud:
userDataBase64: IyEvYmluL3NoCgplY2hvICdwcmludGVkIGZyb20gY2xvdWQtaW5pdCB1c2VyZGF0YScK
name: cloudinitdisk
[root@master kubevirt]# kubectl apply -f test.yaml
virtualmachine.kubevirt.io/vm-cirros created
[root@master kubevirt]# kubectl get vm
NAME AGE VOLUME
vm-cirros 21m启动VirtualMachineInstance
virtctl start vm-cirros
kubectl get vmi
virtctl console vm-cirros # 进入虚拟机
按 ctrl+] 退出虚拟机启动和停止命令
virtctl start vm
virtctl stop vm
# Start the virtual machine: 启动虚拟机
kubectl patch virtualmachine vm --type merge -p \
'{"spec":{"running":true}}'
# Stop the virtual machine: 停止虚拟机
kubectl patch virtualmachine vm --type merge -p \
'{"spec":{"running":false}}'vm作为服务公开
[root@master kubevirt]# virtctl expose virtualmachine vm-cirros --name vmiservice-node --target-port 22 --port 24 --type NodePort
[root@master kubevirt]# kubectl get svc
