Are ELB and CES Mandatory for AS?


AS can work independently or work together with ELB and CES.

CES does not require additional fees and is enabled by default. You can enable the ELB service when required. For example, if distributed clusters are required, you can enable the ELB service.

Other related questions:
What Is ELB?

ELB is a service that automatically distributes incoming traffic across multiple backend Elastic Cloud Servers (ECSs) based on specified forwarding policies. It improves the fault tolerance and expand service capabilities of your applications. ELB also eliminates single points of failure (SPOFs) and improves system availability.

In addition, ELB supports centralized deployment on both the internal and external networks, active/standby VRRP deployment, and access through VPNs and Direct Connect connections and across VPCs.

You can create a load balancer on a web-based console, configure monitoring ports of the service, and configure ECSs associated with the load balancer.

What are the application scenarios of ELB
ELB application scenarios include service distribution, service expansion, and access control.

Does ELB Support ECSs Running Different OSs?

The service has no requirements for the OSs used on backend ECSs.

ELB will run properly if your ECSs have consistent data and the same applications deployed. Although there are no specific requirements for backend OSs, it is recommended that you install the same OS on all of your ECSs to simplify operation and maintenance (O&M).

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