Constraints

Kubernetes Versions

Kubernetes clusters connected to UCS must be between v1.19 and v1.28.

Regions

When a cluster connects to UCS through a private network, you need to use Direct Connect (DC) or Virtual Private Network (VPN) to connect the on-premises network to the cloud VPC, and use VPC Endpoint (VPCEP) to connect to UCS through the private network.

In this scenario, when creating a DC, VPN, VPC, or VPCEP, you can create it only in AP-Singapore. No region restriction is involved if you are not using a private network to connect your cluster to UCS.

Functions

UCS is in open beta test (OBT). Functions including service mesh, container intelligent analysis (CIA), and Operator Service Center (OSC) are not yet available.

Quota Limits

Quotas put limits on the quantity or capacity of resources available to users. UCS has quota limits on clusters, fleets, permissions, and cluster federations, as shown in Table 1. If the default quota provided by UCS cannot meet your service requirements, you can submit a service ticket to increase your quota.

• Cluster quota: specifies the maximum number of clusters connected to UCS. This item applies to Huawei Cloud clusters, on-premises clusters, attached clusters, multi-cloud clusters, and partner cloud clusters.
• Fleet quota: specifies the maximum number of fleets owned by a user.
• Permission quota: specifies the maximum number of permission policies that a user can create on the Permissions page.
• Cluster federation quota: specifies the maximum number of cluster federations that a user can enable. You cannot request a quota increase.

For other cloud services you may also use when running UCS, such as Elastic Cloud Server (ECS), Elastic Volume Service (EVS), Virtual Private Cloud (VPC), Elastic Load Balance (ELB), SoftWare Repository for Container (SWR), and Domain Name Service (DNS), their quotas are independent of those of UCS and are managed by themselves. For details, see Quotas.