ACS usage limits and quotas - Container Compute Service - Alibaba Cloud Documentation Center

Limits

Before you use Alibaba Cloud Container Compute Service (ACS), be aware of the following limits:

After you create an ACS cluster, the following changes are currently not supported:
- Change the Virtual Private Cloud (VPC) of the cluster.
- Change the container network plug-in.
- Change the storage plug-in.
- Migrate applications between namespaces.
The following traffic limits apply when you access the control plane components of a cluster:

Because of bandwidth limits, reading a large number of cluster events in a single API or command-line interface (CLI) request can throttle requests to the control plane components (API server and etcd). This can cause the read operation to fail. To prevent this, query cluster events in the ACS console by navigating to Operations > Event Center. Alternatively, add a pagination parameter, such as --chunk-size=500, to your API call or command to reduce the amount of data in a single request.

Quotas

Item	Upper limit	Default quota	How to increase
Total number of ACS clusters per account	20	3	You can go to Quota Center to apply for an increase to the default quota. Select Total Number of ACS Clusters as the quota name. Note If the upper limit cannot meet your business requirements, you can to contact technical support. For Product, select Container Service for Kubernetes.
Total number of pay-as-you-go elastic vCores per region	30,000 vCPUs	300 vCPUs	Go to Quota Center, select the target region, and request an increase to the default quota. Note If the upper limit cannot meet your business requirements, you can to contact technical support. For Product, select Alibaba Cloud Container Compute Service (ACS).

Capacity limits

Item	Upper limit	How to increase
etcd storage capacity	8 GB	Cannot be increased
Total size of each etcd object type	800 MB	Cannot be increased
Pods	50,000	Once this limit is reached, the system rejects requests to create new pods. You can to request a quota increase. Important If many pods are associated with services, keep the number below 20,000.
Services	10,000	Once this limit is reached, the system rejects requests to create new services. You can to request a quota increase. Note If a single namespace contains many services, the large volume of environment variables injected by kubelet can cause pods to start slowly or fail. To resolve this performance bottleneck, you can disable this injection by setting `enableServiceLinks: false` in the pod specification.
ConfigMaps	30,000	You can to request a quota increase.
Secrets	10,000
Persistent volume claims (PVCs)	10,000
Persistent volumes (PVs)	10,000
Total number of custom resources (CRs) of a single type	100,000	The default limit is 10,000 and can be raised to a maximum of 100,000 on request. Once this limit is reached, the system rejects requests to create new resources. You can to request a quota increase.
Total number of custom resource definitions (CRDs)	100,000	Cannot be increased

Concurrency limits

Image cache

The following table lists the maximum number of calls per minute for each API in a single region.

API	Max calls per minute
CreateImageCache	300
DeleteImageCache	300
ListImageCaches	600
GetImageCache	6,000

Instance delivery throughput

The following table describes the upper limits of instance-related throughput per minute for a single Alibaba Cloud account (primary account) in a single region (including internal retries). By default, all clusters in a region share the same limits. To request per-cluster quota allocation, you can submit a ticket to contact technical support.

ACS uses a token bucket algorithm per Alibaba Cloud account per region to throttle instance-related operations such as creating (starting), deleting, hibernating, and resuming container instances or pods. The token bucket capacity corresponds to the burst rate, which is the maximum number of requests allowed in a short period. The token fill rate corresponds to the continuous rate, which is the average request processing capacity over a long period.

Instance-related capability	Token bucket capacity (burst rate)	Token fill rate (continuous rate)
Instance creation	100	20
Instance deletion	100	20
Instance hibernation	50	10
Instance resumption	50	10
Checkpoint creation	50	10
Checkpoint deletion	50	10
Commit creation	50	10
Commit deletion	50	10

Underlying service quotas

Category	Item	Default quota	How to increase
Virtual Private Cloud (VPC) limits	The maximum number of custom route entries that you can create in a route table (excluding dynamically propagated route entries).	200	Request a quota increase on the Quota Management page or in Quota Center.
	The maximum number of dynamically propagated route entries in a route table.	200
	The maximum number of vSwitches that you can create in a VPC.	150
	The maximum number of VPCs that you can create in a region.	10
	The maximum number of private network addresses that cloud resources in a VPC can use.	300,000 1. If an ECS instance has only one private IP address, it consumes only one network address. 2. If an ECS instance is attached to multiple elastic network interfaces (ENIs) or an ENI has multiple IP addresses, the number of network addresses it consumes is the sum of all IP addresses on its attached ENIs.	No
	Number of private IP addresses that a VPC-type security group can contain for a single Alibaba Cloud account in a specific region	Basic security groups: 6000 Note Capacity usage is the total number of private IP addresses on all associated ENIs (primary and secondary), including primary private IPv4, IPv6, secondary private IPv4, IPv4 prefixes, and IPv6 prefixes. If you need more than 6,000 private IP addresses to communicate over the internal network, assign the ECS instances to multiple security groups and add rules that authorize mutual access. View the maximum private IP address count for a basic security group in a VPC in Quota Center with quota ID `q_vpc-normal-security-group-ip-count`. Enterprise security groups: 65,536 Capacity usage is based on the total number of ENIs (primary and secondary) associated with the security group.	No
	Maximum number of elastic network interfaces (secondary network interfaces) that can be created by a single Alibaba Cloud account in a specific region	View in Quota Center.	Go to Quota Center to request a quota increase.
	Pay-as-you-go EIPs per account (excludes subscription EIPs)	20	Go to Quota Center to request a quota increase.
Server Load Balancer (SLB) limits	Maximum number of CLB instances that can be created by each Alibaba Cloud account	30	You can request a quota increase by using one of the following methods: Go to the Quota Management page in the CLB console, find the quota slb_quota_instances_num, and then click Apply in the Actions column. For more information, see Manage quotas. Log on to the Quota Center console and request a quota increase. For more information, see Manage CLB quotas.
	Maximum number of backend servers that can be added to a CLB instance	200	You can request a quota increase by using one of the following methods: Go to the Quota Management page in the CLB console, find the quota slb_quota_backendservers_num, and then click Apply in the Actions column. For more information, see Manage quotas. Log on to the Quota Center console and request a quota increase. For more information, see Manage CLB quotas.
	Maximum number of listeners that can be added to a CLB instance	50	You can request a quota increase by using one of the following methods: Go to the Quota Management page in the CLB console, find the quota slb_quota_listeners_num, and then click Apply in the Actions column. For more information, see Manage quotas. Log on to the Quota Center console and request a quota increase. For more information, see Manage CLB quotas.
Cloud Disk limits	Pay-as-you-go Cloud Disk quantity quota per account across all regions	You can view the quota in Quota Center.	You can to request a quota increase.
Cloud Disk limits	Pay-as-you-go Cloud Disk capacity quota for data disks per account	This quota depends on your cloud server usage, region, and Cloud Disk type. You can view the quota in Quota Center. For more information, see View or increase EBS quotas.	You can to request a quota increase.