Load Balancer

Application Loadbalancer / Network Loadbalancer
Network-based load balancer works on TCP/UDP/ICMP
App-Based load Balancer works on Application Layer [Http/Https]
Load Balancer Public [Comes with Public IP] and Private [With private Ip]
Task: service discovery, health check, Algorithm
Flexible Shape or Dynamic Shape
Layer 4 or Layer 7 LB
You can attach NSG, by default not enabled
LB can be attached to only one subnet
You can enable WAF at LB
Listener : [Same AWS target group]
- Weighted round-robin [Round robin with weighted distribution]
- Ip Hash [Bound Ip to make a request to the same server]
- Least request [Redirect Request to the server which has the least number of conenction]

Up to 16 Listener, 4-state health checks, updated every 3 minute
There can be downtime in change shape as the existing connection will be drained
Health Check status
- OK
- INVALID_STATUS_CODE
- TIMEOUT
- REGEX_MISMATCH
- IO_ERROR
- OFFLINE
- UNKNOW
Route based on Virtual Hostname or path-based routing

OCI Traffic Management and Health Checks

A global Service, generally used in DR/HA to perform Request regional Request Routing

Traffic Management

Health check