二零二三年 优质公开课NetworkCloudService2ElasticLoadBalance.pptx

Shenzhen Polytechnic College of Electronics and Communication EngineeringNetwork Cloud Service - Elastic Load Balance ELB ConceptElastic load balance automatically distributes access traffic to multiple elastic cloud servers to extend service capabilities of the application system to achieve higher level of fault tolerance. ELB Product ArchitectureLoad Balancer – ELB instance Listener – sound monitormember – back-end virtual machineHealth Check – health examinationLoad Balancer (LVS)ListenerMemberListenerListenerMemberMemberMemberMemberMemberMemberMemberMemberMemberMemberMemberHealthCheckHealthCheckHealthCheckELB mainly consists of three basic concepts:LoadBalancer represents an ELB instance. The realization of LoadBalancer often uses LVS (Linux Virtual Server)Listener represents user customized load balance policy and forwarding rulesMember is the backend service instance (VM or application container) Access requests from outside are distributed to back-end members for processing through load balancer according to relevant policies and forwarding rules. ELB Product AdvantageHigh availability Ultra flexibilityHigh performanceProduct advantageHigh availability: Redundant design automatically removes abnormal nodes, and reroutes traffic between normal nodes to ensure the availability of services.Ultra flexibility: According to the traffic of application, the processing capacity can be automatically expanded, and can be seamlessly integrated with the elastic scaling service to automatically meet the changing traffic demand.High performance: It supports up to 100000 concurrent connections to meet users large traffic demand; supports users to use layer 4 (TCP protocol) or layer 7 (HTTP protocol, HTTPS protocol) load distribution. ELB Application ScenariosWebsite applicationEnterprise portalInternet startupsFor users with requirements for service reliability and performance, it can distribute traffic to different back-end cloud servers through ELB, provide external servic