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Limits

Last Updated: Jan 28, 2021

This topic lists the quotas of Server Load Balancer (SLB) resources.

SLB provides an API operation to query the quotas of SLB resources.

Item

Quota

Adjustable

Limits on SLB instances

Go to the Quota Management page to increase the quota. For more information, see Manage service quotas.

SLB instances that can be created in an account

30

Maximum number of times that an ECS instance can be attached to an SLB instance

50

Maximum number of backend servers that can be attached to an SLB instance

200

Maximum number of listeners that can be configured for an SLB instance

50

Maximum number of domain name-based and URL-based forwarding rules that can be added to an HTTP or HTTPS listener

40

Maximum number of additional certificates that an HTTPS listener can create

3

Range of frontend and backend ports that can be used by a listener (Alibaba Cloud)

1-65535

Range of frontend and backend ports that can be used by a listener (Finance Cloud)

  • 80

  • 443

  • 2800-3300

  • 5000-10000

  • 13000-14000

Limits on certificates

Maximum number of server certificates that can be uploaded in a region

100

Maximum number of client Certificate Authority (CA) certificates that can be uploaded in a region

100

Limits on access control lists

Maximum number of access control lists that can be created in a region

50

Maximum number of IP addresses that can be added to an access control list

300

Maximum number of IP addresses that can be added to an access control list in an API operation

50

Maximum number of times that an access control list can be associated with listeners

50

Public key algorithms supported by SLB

  • RSA 1024

  • RSA 2048

  • RSA 4096

  • ECDSA P-256

  • ECDSA P-384

  • ECDSA P-521

Not supported.