array本地负载均衡详细技术介绍.ppt

TMX Technical Training Server Load Balancing Objectives To understand Server Load Balancing concepts. To understand Array Server Load Balancing configuration steps. Topics Unit 1: Basic Server Load Balancing Concepts and Configuration Unit 2: Additional Server Load Balancing Concepts and Configuration Appendix: Web Concepts Unit 1: Basic SLB Concepts What is Server Load Balancing? SLB Terminology Array SLB Benefits SLB Modes Real Services Simple Group Methods Virtual Services Simple Policy Types What is Load Balancing? It’s in everywhere actually!!! What is Server Load Balancing (SLB)? SLB allows web sites to be scaled from a single service to a group of services (service farm) while distributing the load between the services based on their load and health. SLB Benefits Greater scalability in the number of services for a site reduces load on individual services and improves response time to clients Improved resiliency through Health Checking of services, services, and web content Better control of service resource usage through implementation of different load balancing algorithms Traffic management based on TCP/UDP port number, URL, HTTP Host Header, Cookie content, or SSL Session ID SLB Terminology Real Service (“Real”) Represents a physical service which will handle client requests Real Service Group (“Group”) Represents a group of real services which traffic will be distributed to Defines which load balancing algorithm to use Virtual Service (“Virtual”) Represents a virtual service that clients can connect to Policy Associates real service groups with virtual services Server Load Balancing Example Basic Server Load balancing SLB Modes Server Load Balancing can be performed in two modes: Reverse Proxy Mode Array TM proxies all client connections to real services. Transparent Mode Array TM transparently proxies all client connections to real services. Reverse Proxy Mode Packet Flow Client connects to VIP on Array TM and sends request to Array TM. Array TM opens a