Origin pools

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Edge Security Acceleration (ESA) provides the origin pool feature to distribute and manage traffic on points of presence (POPs) to ensure the even distribution of traffic and optimize resource utilization. This not only improves service availability and reliability, but also enhances the overall network performance and user experience.

How it works

ESA can steer traffic among origin servers in a pool based on their weights. Origin pools can be referenced by ESA-covered domains and TCP/UDP proxied applications. By integrating origin pools with load balancing, you can flexibly steer traffic to reduce origin strain and boost your service availability.

Create an origin pool

In the ESA console, choose Websites and click the website name you want to manage.
In the left-side navigation pane, choose Traffic > Origin Pools.
On the Origin Pools page, click Create Origin Pool.
On the Create Origin Pool page, configure the Pool Name and Origin Server parameters.
- Pool Name
  The name of the origin pool. The name cannot be modified after the origin pool is created. A pool name can be up to 200 characters in length. The following characters are supported:
  - Lowercase letters.
  - Numbers.
  - Hyphens (-). A pool name cannot start or end with a hyphen (-).
- Domain Name
  The hostname that is automatically generated.
  Format: poolName + .origin-pool. + yourWebsiteDomainName
- Origin Server - Name
  The name of the origin server.
- Origin Server - Type
  The type of the origin server. Valid values:
  - IP/Domain: The value can be an IPv4 address, IPv6 address, or domain name.
  - OSS: Alibaba Cloud Object Storage Service (OSS).
  - S3-compatible: AWS Simple Storage Service (S3)-compatible storage.
- Origin Server - Origin Address
  The address of the origin server.
- Origin Server - Weight and Percent
  Valid values: 0 to 100. Default value: 50. The minimum step size for weight adjustments is 1. A weight of 0 specifies that no requests are sent to the origin server.
  The system calculates a percentage value based on your configured weight. This percentage indicates the proportion of traffic distribution for your reference.
- Origin Server - Origin Host Header
  The Host header included in the request to the origin server.
  Note
  If you do not specify this parameter, the host policy configured in the DNS record is used.
After you add the information about all origin servers, click OK.

Delete an origin pool

In the ESA console, choose Websites and click the website name you want to manage.
In the left-side navigation tree, choose Traffic > Origin Pools.
Find the origin pool that you want to delete and click Delete in the Actions column.
Note
If the origin pool is referenced by a load balancer, remove the origin pool from the load balancer. If an origin pool is removed when it is referenced by a load balancer, issues such as abnormal traffic scheduling, service interrruption, and health check failure may occur.