Need for scale, the Serverless way

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Need for scale, the serverless way Ahmed Nada Lead Consultant @readify a_nada

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Hi, I’m Ahmed… aka Nada history.com mygc.com.au a_nada anadaz ahnada

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Takeaways 1. Serverless option to scale Kubernetes and how it works. 2. Readiness for production @a_nada

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Kubernetes Master Node Worker Node Worker Node

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Azure Kubernetes Service (AKS) Master Node Worker Node Worker Node Azure Customer

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ACI • Fast provisioning of containers. • Only pay per second for execution time. • No need to provision virtual machines. @a_nada

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Why don’t we have both!

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Enter Virtual Nodes

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How to enable Virtual Nodes?

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az aks enable-addons --resource-group rg-azbc --name aks-azbc --addons virtual-node --subnet-name sbnt-virtual-node

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Virtual Nodes Node A Virtual Node AKS Kubelet Proxy P P P ACI P P kubectl

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Demo 1

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Virtual Kubelet @a_nada • Open source project started by Microsoft. • Donated to CNCF • Cloud providers support virtual-kubelet.io

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Kubelet Is the primary “node agent” that runs on each node to manage pods.

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Kubelet Node A Node B Master Node Kubelet Proxy P P P Kubelet Proxy P P scheduler api-server controller kubectl

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Virtual Kubelet Node A Virtual Node AKS Kubelet Proxy P P P ACI P P kubectl

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github.com/virtual-kubelet/

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Provider interface

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Providers • Alibaba Cloud Elastic Container Instance (ECI) • AWS Fargate • Azure Batch • Azure Container Instances (ACI) • Kubernetes Container Runtime Interface (CRI) • Huawei Cloud Container Instance (CCI) • HashiCorp Nomad • OpenStack Zun • vSphere Integrated Containers (VIC) @a_nada

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Assign Pods to Node • nodeSelector • Affinity and anti-affinity • Taints and Tolerations @a_nada

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kubectl taint nodes node1 os=linux:NoSchedule tolerations: - key: "os" operator: "Equal" value: "linux" effect: "NoSchedule" tolerations: - key: “virtual-kubelet" operator: “Exists" effect: "NoSchedule"

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Demo 2

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Windows-based containers • By joining Windows nodes to a Linux-based cluster, release of Kubernetes 1.14 • Using Virtual Kubelet @a_nada

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Demo 3

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Is it ready for production?

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Still a preview feature

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Limitations • Liveness and readiness probes • VNet peering • Init containers • Host aliases support • DaemonSets will not deploy pods to the virtual node @a_nada

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Summary 1. Serverless option to scale Kubernetes. 2. Virtual Kubelet 3. Windows containers with AKS @a_nada

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Resources @a_nada • aka.ms/VirtualNode • github.com/virtual-kubelet • virtual-kubelet.io • Community #virtual-kubelet at slack.k8s.io • aka.ms/learnkubernetes

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a_nada Thank You anadaz ahnada