目錄表
Chapter 5-9: Load Balancer Theory
0x00 Types of Load Balancer
- Application Load Balancer
- Network Load Balancer
- Classic Load Balancer
0x01 Application Load Balancer
Application Load Balancers are best suited for load balancing of HTTP and HTTPS traffic.
They operate at Layer 7 and are application-aware.
They are intelligent, and you can create advanced request routing, sending specified requests to specified web servers.
0x02 Network Load Balancer
Network Load Balancers are best suited for load balancing of TCP traffic where extreme performance is required.
Operating at the connection level (Layer 4), Network Load Balancers are capable of handling millions of requests per second, while maintaining ultra-low latencies.
Use for extreme performance.
0x03 Classic Load Balancer
Classic Load Balancers are the legacy Elastic Load Balancers.
You can load balance HTTP/HTTPS applications and use Layer 7-specific features, such as S-Forwarded and sticky session.
You can also use strict Layer 4 load balancing for applications that rely purely on the TCP protocol.
Load Balancing Error
If your application stops responding, the ELB (Classic Load Balancer) responds with a 504 error.
This means that the application is having issues.
This cloud be either at the Web Server Layer or the Database Layer.
Identify where the application is failing, and scale it up or out where possible.
0x04 X-Forwarded-For Header
