Basic Concepts in architecture

Scale on: Upgrade on an existing server or switch directly to a new, higher performance server.

Scale out: Scaled-out, multiple servers are concurrently responding to requests from clients. Advantages: Low cost, simple extension architecture.

Cluster: A cluster, a redundant set of computers, that each computer implements the same functionality for load sharing and high availability.

Lb:load balancing/balancer Load balancer or load balancer.

Ha:high Availability High Availability

Hp:high Performance High Performance

Director: Dispatcher, which is the load balancer, is responsible for receiving client requests and distributing the request to a server that actually provides services in the background, based on an algorithm. Hardware such as F5, software such as Lvs,nginx

Lvs:linux Virtual Server

Realserver: is the server behind lb, and when LB receives the request, the request is forwarded to these servers by a certain load-balancing algorithm.

Basic Concepts in architecture