As such, you see better pod startup latency and less resource (CPU and memory) usage.īy using containerd for AKS nodes, pod startup latency improves and node resource consumption by the container runtime decreases. With a containerd-based node and node pools, instead of talking to the dockershim, the kubelet talks directly to containerd using the CRI (container runtime interface) plugin, removing extra hops in the data flow when compared to the Docker CRI implementation. The current Moby (upstream Docker) version that AKS uses is built on top of containerd. Containerd was donated to the Cloud Native Compute Foundation (CNCF) in March of 2017. For more information about this retirement, see the AKS release notes.Ĭontainerd is an OCI (Open Container Initiative) compliant core container runtime that provides the minimum set of required functionality to execute containers and manage images on a node. Docker is being retired and won't be supported as of May 2023. For Windows Server 20 node pools, containerd is generally available and is the only runtime option on Kubernetes version 1.23 and higher. For Linux node pools, containerd is used on Kubernetes version 1.19 and higher. The runtime helps abstract away sys-calls or operating system (OS) specific functionality to run containers on Linux or Windows. Container runtime configurationĪ container runtime is software that executes containers and manages container images on a node. For more information about this retirement, see the AKS release notes.
Windows Server 2019 is being retired after Kubernetes version 1.32 reaches end of life (EOL) and won't be supported in future releases. Windows Server 2019 can also be specified at nodepool creation for Kubernetes versions 1.32 and below.
Ubuntu 18.04 can also be specified at nodepool creation for Kubernetes versions 1.24 and below.ĪKS supports Windows Server 2022 as the default operating system (OS) for Windows node pools in clusters with Kubernetes 1.25 and higher.
OS configurationĪKS supports Ubuntu 22.04 as the only node operating system (OS) for clusters with Kubernetes 1.25 and higher. This article introduces a few options for customizing your AKS cluster. As part of creating an AKS cluster, you may need to customize your cluster configuration to suit your needs.
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