The document summarizes the speaker's experience at the de:code 2019 technical conference hosted by Microsoft. It discusses several sessions that were of interest, including Windows containers, Virtual Kubelet which allows Kubernetes to manage non-node resources, Kubernetes-based event-driven autoscaling (KEDA), and NetApp services. It also provides a demo of using Virtual Kubelet to run both Linux and Windows containers on AKS clusters through Azure container instances, showing how the pods are scheduled on virtual nodes.

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Recap of de:code 2019

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Kyohei Mizumoto(@kyohmizu)
C# Software Engineer
Interests
Docker/Kubernetes
Go
Security
whoami

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de:code 2019
https://www.microsoft.com/ja-jp/events/decode/2019/default.aspx
The technical conference for all IT engineers hosted by
Microsoft
Held on 29th, 30th May

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de:code 2019
Most of sessions are about Microsoft Azure
Lots of sessions about AKS
The number of introduction examples is increasing
Their ervices(cloud services especially) are getting
sophisticated
More simple, more functional

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What I was interested in
Windows Containers
Virtual Kubelet
Kubernetes-based Event-driven Autoscaling(KEDA)
NetApp Services

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Windows Containers

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Windows Containers on k8s
https://cloudblogs.microsoft.com/opensource/2019/03/25/windows-
server-containers-now-supported-kubernetes/
Single Kubernetes cluster can have both Linux nodes and Windows
Server nodes

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Windows Containers on AKS
https://docs.microsoft.com/en-us/azure/aks/windows-container-cli
Preview feature
Multiple nood pools
You need to:
Install aks-preview CLI extension
Add a Windows Server node pool

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Virtual Kubelet

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Virtual Kubelet
https://github.com/Virtual-Kubelet/Virtual-Kubelet
"Kubernetes API on top, programmable back."
Allows the nodes to be backed by other services
(ACI, AWS Fargate, IoT Edge etc)
Enable the extension of the k8s API into serverless
container platforms
Denoted to CNCF from Microsoft

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How It Works

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Providers
Alibaba Cloud ECI Provider
Azure Container Instances Provider
AWS Fargate Provider
HashiCorp Nomad Provider
OpenStack Zun Provider
(Adding a New Provider via the Provider Interface)

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Virtual Nodes on Azure Portal

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Virtual Nodes on Azure Portal
ACI is added in AKS
$ kubectl get node
NAME STATUS ROLES AGE --
aks-agentpool-20139558-0 Ready agent 19m
aks-agentpool-20139558-1 Ready agent 19m
virtual-node-aci-linux Ready agent 17m

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KEDA

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https://github.com/kedacore/keda
Kubernetes-based Event-driven Autoscaling
0-1 autoscaling
Run on both the Cloud and the Edge

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How It Works

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How It Works
KEDA acts as:
an agent to activate and deactivate a deployment to
scale to/from zero on no events
a Kubernetes metrics server to expose rich event data
to the HPA to drive scale out

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NetApp Services

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Azure NetApp Files
https://cloud.netapp.com/azure-netapp-files/
https://docs.microsoft.com/en-us/azure/azure-netapp-files/

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NetApp Kubernetes Service
https://cloud.netapp.com/kubernetes-service

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Demo

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Vertual Kubelet with AKS
https://docs.microsoft.com/en-us/azure/aks/virtual-kubelet
Install vertual kubelet(Windows + Linux)
Deploy Pods on vertual kubelet nodes

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Before You Begin
Register Container Instances feature provider
Initialize Helm
Service account for RBAC-enabled clusters
$ helm init --service-account tiller

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Install
$az aks install-connector
--resource-group myResourceGroup
--name myAKSCluster
--connector-name virtual-kubelet
--os-type Both

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Validate Vertual Kubelet
1 node + 2 virtual kubelet nodes
$ kubectl get node
NAME STATUS --
aks-agentpool-20139558-0 Ready
virtual-kubelet-virtual-kubelet-linux-japaneast Ready
virtual-kubelet-virtual-kubelet-windows-japaneast Ready

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Deploy on Vertual Kubelet
Pods for virtual kubelet are deployed on the normal
node
$ kubectl get po -o wide
NAME
READY STATUS RESTARTS AGE IP NODE --
pod/virtual-kubelet-linux-japaneast-virtual-kubelet-for-aks-87rd2m5
1/1 Running 0 17m 10.244.0.14 aks-agentpool-20139558-0
pod/virtual-kubelet-windows-japaneast-virtual-kubelet-for-aks-9fzw5
1/1 Running 0 17m 10.244.0.15 aks-agentpool-20139558-0

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Run Linux Container
apiVersion: apps/v1
kind: Deployment
metadata:
name: aci-helloworld
spec:
replicas: 1
selector:
matchLabels:
app: aci-helloworld
template:
metadata:
labels:
app: aci-helloworld
spec:
containers:
- name: aci-helloworld
image: microsoft/aci-helloworld
ports:
- containerPort: 80
nodeSelector:
beta.kubernetes.io/os: linux
kubernetes.io/role: agent
type: virtual-kubelet
tolerations:
- key: virtual-kubelet.io/provider
operator: Equal
value: azure
effect: NoSchedule

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Run Linux Container
The pod is running on the linux virtual kubelet node
$ kubectl apply -f vk-linux.yaml
deployment.apps/aci-helloworld created
$ kubectl get po -o wide
NAME READY STATUS RESTARTS AGE
IP NODE --
aci-helloworld-657c97d89b-7lnpm 1/1 Running 0 65s
40.81.220.187 virtual-kubelet-virtual-kubelet-linux-japaneast

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Run Windows Container
apiVersion: apps/v1
kind: Deployment
metadata:
name: nanoserver-iis
spec:
replicas: 1
selector:
matchLabels:
app: nanoserver-iis
template:
metadata:
labels:
app: nanoserver-iis
spec:
containers:
- name: nanoserver-iis
image: microsoft/iis:nanoserver
ports:
- containerPort: 80
nodeSelector:
beta.kubernetes.io/os: windows
kubernetes.io/role: agent
type: virtual-kubelet
tolerations:
- key: virtual-kubelet.io/provider
operator: Equal
value: azure
effect: NoSchedule

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Run Windows Container
The pod is running on the windows virtual kubelet node
$ kubectl apply -f vk-windows.yaml
deployment.apps/nanoserver-iis created
$ kubectl get po -o wide
NAME READY STATUS RESTARTS AGE
IP NODE --
nanoserver-iis-6465dc649f-v7q2x 1/1 Running 0 53s
20.43.88.185 virtual-kubelet-virtual-kubelet-windows-japaneast

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Access to the Pods
Pods on vertual kubelet nodes have public IP address
No need to create service resources

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Thank you!