Azure Linux nodes will default to using cgroupsv2 starting AKS 1.29

[flora-taagen]

Please note that Azure Linux nodes on kubernetes version 1.28 will be end of life in November 2024. When upgrading to kubernetes version 1.29 or above, Azure Linux will default to cgroupsv2 which may impact your workloads.

[hterik]

I'm a bit confused. This has been described as the default in AKS since 1.25, for example here https://github.com/Azure/AKS/releases/tag/2023-07-16 here: https://learn.microsoft.com/en-us/troubleshoot/azure/azure-kubernetes/create-upgrade-delete/aks-increased-memory-usage-cgroup-v2#cause and here https://doc.kaas.thalesdigital.io/docs/Breakingchanges/aks125

Which version of cgroups is really used and how can one verify this? :slightly_smiling_face:

[flora-taagen]

@hterik

Ubuntu has defaulted to cgrouspv2 since AKS 1.25. Azure Linux has defaulted to cgroupsv2 since AKS 1.29

To check the cgroups version on your nodes you can run the following command: grep cgroup /proc/filesystems

If your system supports cgroupv2, you would see: nodev cgroup nodev cgroup2

On a system with only cgroupv1, you would only see: nodev cgroup

[eeowaa]

For those running Node.js workloads on Azure Linux AKS nodes, ensure that you are using Node.js 20.3 or greater, otherwise you will run into memory issues. See also: https://github.com/Azure/AKS/issues/3443#issuecomment-1703354926

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