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Limits

Last Updated: May 06, 2021

This topic describes the quotas of Classic Load Balancer (CLB) resources.

Item

Quota

Adjustable

Limits on CLB instances

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

Maximum number of CLB instances that can be created within an account

30

Maximum number of times that an ECS instance can be associated with a CLB instance

50

Maximum number of backend servers that can be added to a CLB instance

200

Maximum number of listeners that can be configured for a CLB 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 can be created for an HTTPS listener

3

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

1~65535

Range of frontend and backend ports that can be used by a CLB 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 CA certificates that can be uploaded in a region

100

Limits on access control lists (ACLs)

Maximum number of ACLs that can be created in a region

50

Maximum number of IP addresses that can be added to an ACL

300

Maximum number of IP addresses that can be added to an ACL in an API operation

50

Maximum number of times that an ACL can be associated with listeners

50

Public key algorithms supported by CLB

  • RSA 1024

  • RSA 2048

  • RSA 4096

  • ECDSA P-256

  • ECDSA P-384

  • ECDSA P-521

N/A