Kubevirt学习和drawio使用

框架图软件

• 今天发现了一个新的画框图的软件：drawio，这个软件是开源的，地址是：https://github.com/jgraph/drawio-desktop/releases/tag/v15.8.7；
• 这之前在公司的主要的软件就是visio，因为现在的公司切换到MacOS了，因此画图的软件一直是缺失的状态，这个软件今天第一次使用了一下，感觉基本上的需求都是可以满足的；

Kubevirt和k8s等的交互关系

蓝色的部分是kubevirt的组成部分

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kubvirt是什么

• kubevirt 基于k8s，提供了vm的管理能力；可以认为是k8s的一个插件；

热迁移：

• 是一个vmi从当前node迁移到另外一个node的过程，在这个过程中vmi中的workload保持它运行和可访问。

VM相关

vm的重启

• vm的restart=vmi的delete；

• vmi的restart可以通过kubectl delete virtualmachineinstance vm_name来实现；也就是说delete vmi就是在重启vm；

vm的delete

• kubectl delete virtualmachine vm --cascade=false，这个只是删除vm，vmi没有删除，这样的话重建vm会领养这个vmi的；

• kubectl delete virtualmachine vm --cascade=true的效果和 kubectl delete virtualmachine vm是一样的，这就是说先删除vm，然后删除vmi；

vm的定义和vmi的创建

• vm的创建可以通过manifest.yaml文件来提交给k8s创建，kubectl create -f mainfest.yaml；如果spec.running是false的话，vmi是不会创建的，这个时候可以使用virtctl start vm vmi_test来创建一个vmi，可以使用kubectl desrcibe vm vmi_test来查看这个vmi的细节；

vmi 相关

• 在概念上有两个部分组成

• 用于做调度决策的信息

• vm ABI相关的信息

• vmi的管理和pod的管理类似：

• 每一个集群中定义的VM都应当是运行的；

• 删除一个vmi就相当于是关闭vm；

• vmi的生命周期：

• vmi的创建，kubectl create -f vmi.yaml

• vmi的获取，kubectl get vmis

• 获取vmi的定义，kubectl get vmis vmi_test

• vmi的停止，kubectl delete -f vi.yaml或者是Kubectl delete vmis vmi_test；

• 停止的话，就是删除vmi，后面就再也不能启动这个vmi了；

• vmi的暂停，以及vm的暂停，以及恢复

• virtctl pause vmi vmi_test ，virtctl pause vm vm_test

• virtctl unpause vmi vmitest，virtctl unpause vmi vmitest；

• vm的重命名，需要先stop或者pasue

• virtctl rename vmname new_vm_name

参考文献：

kubevirt的doc文档中的architecture的描述： https://kubevirt.io/user-guide/architecture/