Learn how to reduce AWS EKS Windows node startup times to | 90 secs using Karpenter, optimized scripts, and pre-cached images. Boost your cluster's performance!
EKS allows you to host Windows and Linux containers in the same cluster. Linux nodes however are much faster to start with nodes only taking 30s to become available to schedule your pods compared to the 5 or so minutes it takes to start a Windows node on a m5a.xlarge . I’ll share some tricks I used to start Windows nodes in less than 90 s with Karpenter.
. This AMI contains a couple of Powershell scripts to bootstrap the Kubernetes components. Start-EKSBootstrap.ps1 EKS-StartupTask.ps1 Digging around, it appears there are 3 parts to the EKS Windows node boot process: Start the EC2 Instance Start-EKSBootstrap.ps1 EKS-StartupTask.ps1 So the longest task is the bootstrap script.
.Tools.EKS The effect of removing the EKS allows you to host Windows and Linux containers in the same cluster. Linux nodes however are much faster to start with nodes only taking 30s to become available to schedule your pods compared to the 5 or so minutes it takes to start a Windows node on a m5a.xlarge . I’ll share some tricks I used to start Windows nodes in less than 90 s with Karpenter.
Image Builder sysprep Windows images produce AMIs and so the first time a new Windows EC2 instance comes about, it has to go about a long initialization process. Every Amazon EC2 Windows instance must go through the standard Windows operating system launch steps, which include several reboots, and often take 15 minutes or longer to complete.
Powershell module from the EC2 instance. .Tools.EC2
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