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).

Other related questions:
Which Forwarding Modes Does ELB Support?

ELB supports the following forwarding modes:

  • Round robin: sends requests to backend ECSs in polling mode. This forwarding rule applies to short-connection services, such as the HTTP service.
  • Least connections: preferentially sends requests to the backend ECS with the least connections. This forwarding rule applies to long-connection services, such as the database service.
  • Source IP address: calculates the hash value of the request source IP address and sends requests to a matched ECS. This forwarding rule ensures that requests initiated from the same source IP addresses are sent to a fixed ECS. This rule applies to TCP connections of load balancers that do not use cookies.

What Types of Sticky Sessions Does ELB Support?

The ELB supports the following types of sticky sessions: Source IP address, App cookie, and HTTP cookie.

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