AKS worker nodes: support for Ubuntu 22.04 LTS

[fnerdman]

The kernel version in 18.04 is just to old, I need a newer kernel version for mainline SGX support and others seem to require 20.04 as well:
#2706
#2829
#1579

[ghost]

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[alexeldeib]

#1579 (comment)

we're working on this

#2829

okay that's a funny one to call out, because we missed a CVE by being too far behind ;) point taken on feature support however, I know that's a problem.

[ghost]

Triage required from @Azure/aks-pm @alexeldeib, @anujmaheshwari1

[gandharv-kapoor]

@alexeldeib Any update on the ETA? We want to use newer versions of Nvidia Trition which are only supported on Ubuntu 20.04.

[jabbera]

@gandharv-kapoor #2897 (comment)

[alexeldeib]

edited to clarify we're going to 22.04 directly

maybe I should have used the other one since there's more context -_- sorry for confusion

[miwithro]

Duplicate of #2897 closing.

[dhirschfeld]

@miwithro - #2897 has been closed and locked as a dup of this issue!

Until this feature is delivered, one or the other issue should probably remain open.

[nijave]

Will this only target k8s 1.25 or will it target older k8s versions? 18.04 mainstream support runs out April 2023 and 1.24 and possibly 1.23 should still be supported then

[alexeldeib]

^planned for 1.25 only right now but we are aware of that potential timeline issue, cc @justindavies

[max-lepikhin]

1.25 is out, any updates on timing of 22.04 image for AKS?

We need it for Intel SGX driver - linux kernel 5.11+ (vs current 18.04 with kernel 5.4).

[jingai-db]

friendly ping :-)

[zerodefect]

Found this release announcement here - https://github.com/Azure/AKS/releases

Starting with Kubernetes 1.25, the following changes will be made default:
Ubuntu 22.04 for x86, AMD and ARM64 architectures will be the default host.

[robin-wayve]

So there isn't going to be a 20.04 image? Only 18.04 and then 22.04?

[zerodefect]

It looks that way. It would be nice to have confirmation.

[jabbera]

It looks that way. It would be nice to have confirmation.

#2883 (comment)

[max-lepikhin]

Related, are there any plans to update Linux kernel from current 5.15 to 6.0+? Specifically, it is required for confidential containers with Gramine.

[max-lepikhin]

1.25 with 22.04 is available, thank you. Still the kernel is lagging significantly:
Kernel Version: 5.15.0-1035-azure
Gramine requires 6.0 for dynamic memory allocation.

What is the roadmap for updating kernel?

[allyford]

Closing this issue as 22.04 is currently supported. @max-lepikhin please create a separate issue for kernel updates. We will likely consider 6.0 or above in Ubuntu 24.04.