Azure/AKS 2024-02-26

Release 2024-02-26

on GitHub

Release 2024-02-26

Monitor the release status by regions at AKS-Release-Tracker.

Announcements

• Starting in March, due to Gatekeeper Upstream removing validation for constraint template contents at create/update time, the Azure Policy addon will now no longer support the validation for constraint template. The Azure Policy Add-On will report ‘InvalidConstraint/Template’ compliance reason code for detected errors after constraint template admission. This change does not impact other compliance reason codes. Customers are encouraged to continue to follow best practices when updating Azure Policy for Kubernetes definitions (i.e. Gator CLI).
• Starting with Kubernetes 1.29, the default cgroups implementation on Azure Linux AKS nodes is cgroupsv2. Older versions of Java, .NET and NodeJS do not support memory querying v2 memory constraints and this will lead to out of memory (OOM) issues for workloads. Please test your applications for cgroupsv2 compliance, and read the FAQ for cgroupsv2.
• AKS patch versions 1.27.9 and 1.28.5 are now available with 1.27.9 used as the default version for new clusters.

Release notes

• Features

  • Istio-based service mesh addon for AKS is now generally available.

• Preview features

  • AI toolchain operator (KAITO) add-on can be enabled to automate large language model (LLM) deployment on your AKS cluster.

• Behavioral change

  • ignoreUnfixed is now set to false in scanner options for Image Cleaner so that images with vulnerabilities are deleted even if there is no fix/patch available for it yet.
  • Label kubernetes.azure.com/managedby: aks has been introduced to all managed addon components on cluster. Related issue can be found here

• Bug fixes

  • Pod overhead of memory 2Gi added to kata-cc-isolation RuntimeClass to address issue where too many pods being created to use too much of the node's memory was resulting in random processes being OOM killed.
  • Fixed issue that was causing PUT operations on AKS clusters that were using Bring your own Container Network Interface (CNI) plugin to fail when the request didn't contain the networkProfile.podCIDR property.
  • In AKS clusters of version >= 1.27.0, fixed a race condition in the iptables mode of kube-proxy that could result in some updates getting lost (for example, when a service gets a new endpoint).
  • Fixed a race condition that could cause upgrade from kubenet to Azure CNI Overlay to fail.

• Component updates

  • Istio revision asm-1-20 is now available with Istio-based service mesh add-on. More information on performing canary upgrade for the new minor revision of Istio can be found here. Istio revision asm-1-18 is no longer supported.
  • Open Service Mesh upgraded to v1.2.8 with Envoy upgraded to v1.26.7 to address vulnerabilities CVE-2024-23324, CVE-2024-23325, CVE-2024-23322, CVE-2024-23323, and CVE-2024-23327.
  • For Node Auto Provisioning, Karpenter is upgraded to v0.33.0 and its Azure provider is upgraded to v0.3.0.
  • Upgraded Azure Disk CSI driver version to v1.26.9 on AKS 1.26, v1.28.6 on AKS 1.27, v1.29.3 on AKS 1.28.
  • Upgraded Azure File CSI driver version to v1.26.11 on AKS 1.26, v1.28.8 on AKS 1.27, v1.29.3 on AKS 1.28.
  • Upgraded Azure Blob CSI driver version to v1.21.7 on AKS 1.26, v1.22.5 on AKS 1.27, v1.23.3 on AKS 1.28.
  • Upgraded kappie-agent Linux and Windows images used in AKS Network Observability to v0.1.4 and v0.1.3 respectively.
  • Upgraded ACI provider for the Virtual Kubelet to v1.6.1
  • Cilium version has been updated to 1.14.4 for AKS clusters with kubernetes versions >= 1.29.0.
  • Azure Linux image has been updated to Azure Linux - 202402.12.0.
  • AKS Ubuntu 22.04 image has been updated to AKSUbuntu-2204-202402.12.0.
  • Windows Server 2019 Image has been updated to Windows Server 2019 - 17763.5458.240218.
  • Windows Server 2022 Image has been updated to Windows Server 2022 - 20348.2322.240218.