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ms.custom: sap:Create, Upgrade, Scale and Delete operations (cluster or nodepool)
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@@ -26,8 +26,7 @@ sections:
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- question: |
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Can I move my cluster to a different subscription, or move my subscription with my cluster to a new tenant?
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answer: |
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If you've moved your AKS cluster to a different subscription or the cluster's subscription to a new tenant, the cluster won't function because of missing cluster identity permissions. AKS doesn't support moving clusters across subscriptions or tenants because of this constraint.
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No. If you've moved your AKS cluster to a different subscription or the cluster's subscription to a new tenant, the cluster won't function because of missing cluster identity permissions. AKS doesn't support moving clusters across subscriptions or tenants because of this constraint. For more information, see [Operations FAQ](/azure/aks/faq#operations).
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What naming restrictions are enforced for AKS resources and parameters?
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- AKS node pool names must be all lowercase. The names must be 1-12 characters in length for Linux node pools and 1-6 characters for Windows node pools. A name must start with a letter, and the only allowed characters are letters and numbers.
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- The *admin-username*, which sets the administrator user name for Linux nodes, must start with a letter. This user name may only contain letters, numbers, hyphens, and underscores. It has a maximum length of 32 characters.
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For more information about naming convention. see the following resources:
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- [Naming rules and restrictions for Azure resources](/azure/azure-resource-manager/management/resource-name-rules#microsoftcontainerservice)
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- [Abbreviation recommendations for Azure resources](/azure/cloud-adoption-framework/ready/azure-best-practices/resource-abbreviations#containers)
Copy file name to clipboardExpand all lines: support/azure/azure-kubernetes/create-upgrade-delete/aks-increased-memory-usage-cgroup-v2.md
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---
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title: Increased memory usage reported in Kubernetes 1.25 or later versions
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description: Resolve an increase in memory usage that's reported after you upgrade an Azure Kubernetes Service (AKS) cluster to Kubernetes 1.25.x.
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ms.date: 07/13/2023
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editor: v-jsitser
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ms.date: 03/03/2025
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editor: momajed
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ms.reviewer: aritraghosh, cssakscic, v-leedennis
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ms.service: azure-kubernetes-service
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ms.custom: sap:Create, Upgrade, Scale and Delete operations (cluster or nodepool)
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## Cause
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This increase is caused by a change in memory accounting within version 2 of the Linux control group (cgroup) API. [Cgroup v2](https://kubernetes.io/docs/concepts/architecture/cgroups/) is now the default cgroup version for Kubernetes 1.25 on AKS.
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This increase is caused by a change in memory accounting within version 2 of the Linux control group (`cgroup`) API. [Cgroup v2](https://kubernetes.io/docs/concepts/architecture/cgroups/) is now the default `cgroup` version for Kubernetes 1.25 on AKS.
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> [!NOTE]
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> This issue is distinct from the memory saturation in nodes that's caused by applications or frameworks that aren't aware of cgroup v2. For more information, see [Memory saturation occurs in pods after cluster upgrade to Kubernetes 1.25](./aks-memory-saturation-after-upgrade.md).
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> This issue is distinct from the memory saturation in nodes that's caused by applications or frameworks that aren't aware of `cgroup` v2. For more information, see [Memory saturation occurs in pods after cluster upgrade to Kubernetes 1.25](./aks-memory-saturation-after-upgrade.md).
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## Solution
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- If you observe frequent memory pressure on the nodes, upgrade your subscription to increase the amount of memory that's available to your virtual machines (VMs).
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- If you see a higher eviction rate on the pods, [use higher limits and requests for pods](/azure/aks/developer-best-practices-resource-management#define-pod-resource-requests-and-limits).
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-`cgroup` v2 uses a different API than `cgroup` v1. If there are any applications that directly access the `cgroup` file system, update them to later versions that support `cgroup` v2. For example:
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-**Third-party monitoring and security agents**:
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Some monitoring and security agents depend on the `cgroup` file system. Update these agents to versions that support `cgroup` v2.
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-**Java applications**:
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Use versions that fully support `cgroup` v2:
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- OpenJDK/HotSpot: `jdk8u372`, `11.0.16`, `15`, and later versions.
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- IBM Semeru Runtimes: `8.0.382.0`, `11.0.20.0`, `17.0.8.0`, and later versions.
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- IBM Java: `8.0.8.6` and later versions.
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-**uber-go/automaxprocs**:
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If you're using the `uber-go/automaxprocs` package, ensure the version is `v1.5.1` or later.
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- An alternative temporary solution is to revert the `cgroup` version on your nodes by using the DaemonSet. For more information, see [Revert to cgroup v1 DaemonSet](https://github.com/Azure/AKS/blob/master/examples/cgroups/revert-cgroup-v1.yaml).
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> [!IMPORTANT]
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> - Use the DaemonSet cautiously. Test it in a lower environment before applying to production to ensure compatibility and prevent disruptions.
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> - By default, the DaemonSet applies to all nodes in the cluster and reboots them to implement the `cgroup` change.
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> - To control how the DaemonSet is applied, configure a `nodeSelector` to target specific nodes.
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> [!NOTE]
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> If you experience only an increase in memory use without any of the other symptoms that are mentioned in the "Symptoms" section, you don't have to take any action.
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## Status
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We're actively working with the Kubernetes community to fix the underlying issue, and we'll keep you updated on our progress. We also plan to change the eviction thresholds or [resource reservations](/azure/aks/concepts-clusters-workloads#resource-reservations), depending on the outcome of the fix.
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We're actively working with the Kubernetes community to resolve the underlying issue. Progress on this effort can be tracked at [Azure/AKS Issue #3443](https://github.com/kubernetes/kubernetes/issues/118916).
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As part of the resolution, we plan to adjust the eviction thresholds or update [resource reservations](/azure/aks/concepts-clusters-workloads#resource-reservations), depending on the outcome of the fix.
title: Troubleshoot the Throttled Error Code (429)
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description: Learn how to resolve the Throttled error (status 429) when you try to create and deploy an Azure Kubernetes Service (AKS) cluster.
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ms.date: 03/05/2025
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ms.reviewer: jovieir, chiragpa, v-weizhu
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ms.service: azure-kubernetes-service
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#Customer intent: As an Azure Kubernetes user, I want to troubleshoot the Throttled error code (status 429) so that I can successfully create and deploy an Azure Kubernetes Service (AKS) cluster.
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ms.custom: sap:Create, Upgrade, Scale and Delete operations (cluster or nodepool)
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---
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# Troubleshoot the Throttled error code (429)
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This article discusses how to identify and resolve the `Throttled` error (status 429) that occurs when you try to create and deploy a Microsoft Azure Kubernetes Service (AKS) cluster.
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## Symptoms
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When you try to create an AKS cluster, you receive the following "The PutManagedClusterHandler.PUT request limit has been exceeded" error message that shows a "SubCode" value of **Throttled** and a "Status" value of **429**:
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> Category: ClientError;
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>
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> SubCode: Throttled;
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>
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> OrginalError: autorest/azure: Service returned an error. **Status=429**
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> **Code="Throttled"**
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> Message="> The PutManagedClusterHandler.PUT request limit has been exceeded for SubID='*\<subscription-id-guid>*', please retry again in X seconds. For more information, please visit aka.ms/aks/throttling";
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Request throttling can occur on various Azure components, so the error message might be different depending on the type of resource where this issue occurs.
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Resource provider throttling is independent of ARM throttling and is tailored to the operations of a specific resource provider. In this scenario, AKS resource provider throttling is specific to the AKS resource provider and applies only to operations related to AKS resources.
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## Cause
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AKS requests are throttled. For information about how AKS limits work and the specific limits per hour, see [Throttling limits on AKS resource provider APIs](/azure/aks/quotas-skus-regions#throttling-limits-on-aks-resource-provider-apis).
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## Solution
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To resolve this issue, examine and modify your access pattern of the throttled subscription. The following table lists the possible access patterns and corresponding solutions.
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| Access pattern | Solution |
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| -------------- | -------- |
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| Automated scripts constantly run LIST operations against managedCluster resources. | Run the scripts less frequently. |
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| Users attempt to deploy multiple AKS clusters in a short period of time. | Space out deployments or use different subscriptions.|
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| Users attempt to modify the same AKS cluster multiple times consecutively. | Space out operations. Ensure successful completion before initiating another one.|
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| Users attempt to add, modify, or delete one or more agentPools on the same AKS cluster. | Space out operations. Ensure successful completion before initiating another one. |
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## More information
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[General troubleshooting of AKS cluster creation issues](troubleshoot-aks-cluster-creation-issues.md)
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[!INCLUDE [Azure Help Support](../../../includes/azure-help-support.md)]
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