Load Balancing Theory
KALYAN
Lead Devops Engineer
Media.net
Why LB
- High Availability during Maintenance and unplanned Downtimes
- Service Discovery or Service Entry point
- Scale Horizontally after all its Load Balancing
Basic Load Balancer
- Distribute Traffic based on algo roundrobin, least connections etc
How is HA achieved
ELB handles differently
- L3 vs L4 vs L7 Health Checks
Connection Tracking and Dual TCP connections
- Connection Reuse
- Client IPs by L7 custom header or L4 proxy protocol
- L7 content switching
SSL offload
- SSL performance
- CDN
- SSL Passthrough, sticky session
Skip Dual TCP Pros and Cons
- L2 and L3 DSR- skim
- NLB
- State Tracking
- SSL offloading