A load balancer is an ELB service entity created to bear services. The load balancer receives requests from clients and distributes them to backend servers. After a load balancer is created, add listeners and backend servers to use the function provided by the LB service.

Description of configuration parameters for load balancers:

Parameter	Description	Value Samples
Name	The name of a load balancer.	elb-yss0
Type	You can select a WAN or an Intranet. WAN: A WAN load balancer provides external services through WAN IP addresses and distributes client requests from the WAN to the backend servers for processing based on the specified LB policies. You must bind an existing EIP. (Note: If you only need to use an IPv6 WAN, you can create Intranet LB and then bind IPv6 WAN bandwidth. Currently, only certain resource pools support IPv6 LB). Intranet: An Intranet load balancer provides external services through Intranet IP addresses and distributes client requests from the same VPC to the backend servers for processing based on the specified LB policies.	Intranet
Owning VPC	Owning virtual private cloud You can use an existing VPC network or create a new VPC. For more information about VPC, see theVPC User Guide.	-
Subnet	Owning subnet. Note: If IPv6 is not enabled for subnets, LB does not support IPv6. If IPv6 is enabled for subnets, LB supports IPv6.	-
LB IP	Automatic or manual allocation. If you select manual allocation, you must enter the corresponding IP address.	Auto-assign
Elastic WAN IP	After being bound with an EIP, the load balancer can receive access requests from the WAN and automatically distributes them to multiple CT-ECSs. You can bind the ELB with an existing EIP to create a LB available for both WAN and Intranets.	New creation
Description	Relevant description of load balancers that can be added.	-

Description of parameters for LB modes:

Health Check Configuration	Description
Backend Host Group Name	It automatically selects a configured backend host group.
Load Mode	Available modes: Round robin, least connection and source address algorithm
Session Persistence Mode	Available modes: APP_COOKIE, HTTP_COOKIE, SOURCE_IP
Session Persistence Time	1000s by default
Getting Client IP	You can choose to enable or disable it and obtain it through X-Forward-for.

Elastic Load Balancing

Load Balancer