Web Application Firewall (WAF) provides intelligent load balancing for services that are added to WAF in CNAME record mode. WAF uses the intelligent multi-node access technology to ensure that access requests to your service are automatically scheduled among multiple nodes or lines to achieve disaster recovery. This ensures high service availability and minimizes access latency.
What is intelligent load balancing?
After you enable intelligent load balancing for a WAF instance, the WAF instance is allocated at least three protection nodes in different regions to implement automatic disaster recovery across nodes and regions. WAF uses the intelligent DNS resolution feature and the least response time algorithm to minimize the path and latency when requests are forwarded to origin servers.
|Capability||Before intelligent load balancing is enabled||After intelligent load balancing is enabled|
|Access acceleration||N/A||Protection capabilities based on the nearest protection node, and the shortest path to the nearest origin server|
|Active geo-redundancy services||Multiple nodes are deployed on the cloud or in data centers across regions. These
nodes simultaneously provide services and work as backups for each other to achieve
Active geo-redundancy services require high reliability and low access latency.
|Co-location multi-active services||Multiple nodes are deployed on the cloud or in data centers in the same region. These nodes simultaneously provide services and work as backups for each other to achieve disaster recovery. Co-location multi-active services require high reliability and low access latency.||
|Co-location single-active service||A single node is deployed on the cloud or in a data center in the same region to provide
Note Co-location single-active services do not have automatic disaster recovery capabilities. You can enable intelligent load balancing to achieve high service availability, automatic disaster recovery, and minimum access latency for these services.
You are charged for the intelligent load balancing feature. The fees are billed to the WAF instance for which you enable the feature.
After you enable intelligent load balancing for one or multiple domain names that are added to a WAF instance in CNAME record mode, intelligent load balancing is enabled for the WAF instance. You are charged regardless of the number of domain names. For more information, see Billing method.
Enable intelligent load balancing
You can enable intelligent load balancing only for domain names that are added to WAF in CNAME record mode.
- On the Website Configuration page of the WAF 3.0 console, click Add on the CNAME Record tab. The Add Domain Name wizard appears.
- In the Configure Listener step, click More Settings, and set Protection Resource to Shared Cluster-based Intelligent Load Balancing.
- In the Change Forwarding Rule step, set Load Balancing Algorithm to Least time.
After your complete the preceding configurations, WAF automatically uses the intelligent DNS resolution feature and least response time algorithm to minimize the path and latency of traffic from protection nodes to origin servers.