Run Windows container with Hyper-V isolation mode in Kubernetes

Windows Container有两种隔离运行模式Hyper-V和Process, 参见:Isolation Modes

两种模式下的host的OS版本与containter的OS版本存在兼容性又不相同,参见:Windows container version compatibility

很明显Hyper-V模式的兼容性要比Process模式要好,向下兼容,也就是高版本的host OS可以运行低版本的container OS, 反之不行;

而Process模式下Windows Server中则要求host OS与container OS的版本完全相同, Windows 10中则不支持Process模式.

 

某一天,我想在Kubernetes Windows 节点中以Hyper-V模式运行Container, 于是乎发现1.17的文档中写道:

Note: In this document, when we talk about Windows containers we mean Windows containers with process isolation. Windows containers with Hyper-V isolation is planned for a future release.

不甘心又google了一下,发现:

1. 有人提了bug, 已经被修复了: https://github.com/kubernetes/kubernetes/issues/58750
2. 代码也merge了: https://github.com/kubernetes/kubernetes/pull/58751
3. 有人在测试过程中遇到问题,也解决了: https://github.com/kubernetes/kubernetes/issues/62812

但我测试的过程中却提示:

Error response from daemon: CreateComputeSystem test: The container operating system does not match the host operating system.

我的环境:

Kubernetes Ver: 1.14.8

Kubernetes Node OS Ver: Windows Server Datacenter 10.0.17763.504, 属于1809的版本

Container Base Image: windowsservercore-1709

Deployment yaml:

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  labels:
    app: test
  name: test
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: test
  template:
    metadata:
      annotations:
        experimental.windows.kubernetes.io/isolation-type: hyperv
      labels:
        app: test
...

 

然后对比了下github别人试成功的deployment yaml, 发现人家用的是apps/v1

apiVersion: apps/v1
kind: Deployment
metadata:
  name: whoami
  labels:
    app: whoami
spec:
  ...

 

目前在k8s中启用hyperv isolation的三个条件:

  1. kubelet 启用参数:  –feature-gates=HyperVContainer=true
  2. Pod/Deployment apiVersion: apps/v1
  3. spec.template.metadata.annotations[].experimental.windows.kubernetes.io/isolation-type:hyperv

参见: https://kubernetes.io/docs/setup/production-environment/windows/intro-windows-in-kubernetes/#hyper-v-isolation

 

目前我的云提供商给的kubernetes 1.14.8又不支持apps/v1 …

于是乎,我要么等提供商升级kubernetes,要么自己升级container OS跟kubernetes node OS一样…

Leave a Comment