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Azure Kubernetes Service (AKS) provides a Long Term Support (LTS) version of Kubernetes for a two-year period. There's only a single minor version of Kubernetes deemed LTS at any one time.
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The Kubernetes community releases a new minor version approximately every four months, with a support window for each version for one year. In Azure Kubernetes Service (AKS), this support window is called "Community support."
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AKS supports versions of Kubernetes that are within this Community support window, to push bug fixes and security updates from community releases.
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While innovation delivered with this release cadence provides huge benefits to you, it challenges you to keep up to date with Kubernetes releases, which can be made more difficult based on the number of clusters you have to maintain.
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### Support types
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After approximately one year, the Kubernetes version exits Community support and your AKS clusters are now at risk as bug fixes, and security updates become unavailable.
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AKS provides one year Community support and one year of long-term support (LTS) to back port security fixes from the community upstream in our public repository. Our upstream LTS working group contributes efforts back to the community to provide our customers with a longer support window.
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LTS intends to give you an extended period of time to plan and test for upgrades over a two-year period from the General Availability of the designated Kubernetes version.
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|| Community Support |Long Term Support |
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|---|---|---|
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|**When to use**| When you can keep up with upstream Kubernetes releases | Scenarios where your applications aren't compatible with the changes introduced in newer Kubernetes versions, and you can't transition to a continuous release cycle due to technical constraints or other factors |
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|**Support versions**| Three GA minor versions | One Kubernetes version (currently *1.27*) for two years |
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The upstream community maintains a minor release of Kubernetes for one year from release. After this period, Microsoft creates and applies security updates to the LTS version of Kubernetes to provide a total of two years of support on AKS.
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> [!IMPORTANT]
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> Kubernetes version 1.27 is the first supported LTS version of Kubernetes on Operator Nexus Kubernetes service.
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> The next LTS version after 1.27 is 1.30, which will start its LTS support in October 2024.
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### Migrate from LTS to the next LTS release
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Nexus Kubernetes clusters don't support direct upgrades between LTS versions. To transition from one LTS version to the next, you have two options: either create a new cluster with the desired LTS version and move your workloads to this new cluster, or perform a series of intermediate upgrades through the supported versions before reaching the next LTS version.
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