Can you explain client-side versus server-side load balancing in microservices?

Client-Side Load Balancing:

• In client-side load balancing, the client is responsible for selecting the appropriate

instance of a service to send the request to, based on the list of available instances.

• The client usually obtains the list of service instances through service discovery

(e.g., Consul, Eureka, Kubernetes DNS).

Pros:

• More control for the client on load balancing strategies (e.g., round-robin,

least connections).

• Reduces pressure on centralized load balancers.
• Cons:
• Adds complexity to client-side logic.
• Requires the client to maintain a list of available instances.

Server-Side Load Balancing:

• In server-side load balancing, a centralized load balancer (e.g., NGINX, HAProxy,

Kubernetes ingress controller) is responsible for distributing the traffic to available

service instances.

Pros:

• Simpler client-side logic.
• Centralized control over load balancing logic and configuration.
• Cons:
• Can introduce a bottleneck or single point of failure.
• Requires more resources and maintenance for the load balancer itself.