This topic describes the limits that apply when you use Container Service for Kubernetes (ACK) clusters.

Overview

Before you get started with ACK, take note of the following limits:

  • Before you purchase ACK instances, you must complete real-name verification.
  • After an ACK cluster is created, you are not allowed to perform the following operations:
    • You cannot change the virtual private cloud (VPC) of the cluster.
    • You cannot change the type of the cluster. For example, you cannot change a dedicated Kubernetes cluster to a managed Kubernetes cluster.
    • You cannot change the network plug-in.
    • You cannot change the volume plug-in.
    • You cannot migrate applications across namespaces.
  • The following limits are imposed on Elastic Compute Service (ECS) instances that run in ACK clusters:
    • ECS instances support the pay-as-you-go and subscription billing methods. Other resources, such as Server Load Balancer (SLB) instances, support only the pay-as-you-go billing method. You can change the billing method from pay-as-you-go to subscription in the ECS console.
    • When you create clusters, expand clusters, or perform auto scaling, you may fail to create nodes due to insufficient resource quota or inventory.
    • If you want to create subscription ECS instances when you create a cluster, you may fail to create the ECS instances due to resource quota limits or inventory availability. After a subscription ECS instance is created, you cannot release the ECS instance before the subscription expires.
      Note To avoid these issues, we recommend that you create pay-as-you-go ECS instances when you create a cluster. You can change the billing method from pay-as-you-go to subscription in the ECS console based on your requirements.
    • Requirements for ECS specifications: You must select ECS instances with 2 or more vCPU cores and memory sizes must be greater than 4 GiB.

Limits on the quota of ACK clusters

Cluster type Maximum number of clusters within an Alibaba Cloud account Maximum number of nodes in a cluster Maximum number of pods on a node Adjustable
Professional managed Kubernetes cluster 100 1000 256

Navigate to the Quota Center page to submit a ticket.

Standard managed Kubernetes cluster 20 40 256 N/A
Dedicated Kubernetes cluster 20 40 256 N/A
Serverless Kubernetes (ASK) cluster 5 N/A N/A

Navigate to the Quota Center page to submit a ticket.

Edge Kubernetes cluster 20 100 256

Navigate to the Quota Center page to submit a ticket.

Registered external Kubernetes cluster 5 N/A N/A

Navigate to the Quota Center page to submit a ticket.

Notice The maximum number of pods on a node cannot be increased. The quota increase methods apply to only the maximum number of clusters within an Alibaba Cloud account and the maximum number of nodes in a cluster.

Quotas of underlying cloud resources

Resource Item Limit (for regular users) Adjustable
Computing Resource Orchestration Service (ROS) quota Default: 100.

Submit a ticket.

vCPU quota of pay-as-you-go instances 500 vCPU cores

Submit a ticket.

High-specification pay-as-you-go instances (with more than 16 vCPU cores) Unavailable for purchase. Only pay-as-you-go instances with less than 16 vCPU cores can be purchased.

Submit a ticket.

vCPU quota of preemptible instances 800 vCPU cores

Submit a ticket.

Change the billing method from pay-as-you-go to subscription Not supported by the following instance families: t1, s1, s2, s3, c1, c2, m1, m2, n1, n2, and e3.

Submit a ticket.

Auto Scaling (ESS) The maximum number of ECS instances in a scaling group is 2,000.

Submit a ticket.

Operating system Nodes that run the following operating systems can be added to an ACK cluster:
  • Alibaba Cloud Linux 2
  • CentOS 7.x
    Note CentOS 8.x and later are not supported.
  • Windows Server 2009 and Windows Server 2009 Core.
N/A
Networking Maximum number of custom route entries in a route table 48

Submit a ticket.

Maximum number of vSwitches in a VPC 24

Submit a ticket.

Maximum number of VPCs within an account 10

Submit a ticket.

Maximum number of private IP addresses in a VPC 65535 N/A
Maximum number of IP addresses that can be added to a basic security group 2000 N/A
Maximum number of elastic network interfaces (ENIs) 50000 N/A
Maximum number of elastic IP addresses (EIPs) within an account 20

Submit a ticket.

Server Load Balancer (SLB) Maximum number of SLB instances within an account 60

Submit a ticket.

Maximum number of backend servers that can be attached to an SLB instance 200 N/A
Maximum number of listeners that can be added to an SLB instance 50

Submit a ticket.

Maximum number of times that an ECS instance can be added to SLB instances as a backend server 50 N/A
Elastic Block Storage (EBS) Maximum number of pay-as-you-go disks in all regions within an account The quota is five times the number of ECS instances across all regions. You can create at least 10 pay-as-you-go disks within each account.

Submit a ticket.

Maximum capacity of pay-as-you-go disks that are used as data disks within an account Subject to ECS resource usage, regions, and disk types. You can go to the Privileges & Quotas page in the ECS console to view details. For more information, see View quotas (old version).

Submit a ticket.

Regions that support ACK

The following tables describe the regions that support ACK:
  • Asia Pacific
    Region City Region ID
    China (Beijing) Beijing cn-beijing
    China (Zhangjiakou) Zhangjiakou cn-zhangjiakou
    China (Hohhot) Hohhot cn-huhehaote
    China (Ulanqab) Ulanqab cn-wulanchabu
    China (Hangzhou) Hangzhou cn-hangzhou
    China (Shanghai) Shanghai cn-shanghai
    China (Shenzhen) Shenzhen cn-shenzhen
    China (Heyuan) Heyuan cn-heyuan
    China (Guangzhou) Guangzhou guangzhou
    China (Chengdu) Chengdu cn-chengdu
    China (Hong Kong) Hong Kong cn-hongkong
    Japan (Tokyo) Tokyo ap-northeast-1
    Singapore Singapore ap-southeast-1
    Australia (Sydney) Sydney ap-southeast-2
    Malaysia (Kuala Lumpur) Kuala Lumpur ap-southeast-3
    Indonesia (Jakarta) Jakarta ap-southeast-5
  • Europe & Americas
    Region City Region ID
    US (Silicon Valley) Silicon Valley us-west-1
    US (Virginia) Virginia us-east-1
    UK (London) London eu-west-1
    Germany (Frankfurt) Frankfurt eu-central-1
  • Middle East and India
    Region City Region ID
    UAE (Dubai) Dubai me-east-1
    India (Mumbai) Mumbai ap-south-1