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Overview

UltraBalancer supports 7 algorithms. Choose based on your needs.

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Algorithms

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round-robin (default)

Even distribution across all backends. 
ultrabalancer -a round-robin -b s1:8080 -b s2:8080
Best for: Similar backends, stateless apps

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least-connections

Routes to backend with fewest active connections. 
ultrabalancer -a least-connections -b s1:8080 -b s2:8080
Best for: Variable response times, long connections

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ip-hash

Same client IP always goes to same backend. 
ultrabalancer -a ip-hash -b s1:8080 -b s2:8080
Best for: Session affinity needed

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random

Random backend selection. 
ultrabalancer -a random -b s1:8080 -b s2:8080
Best for: Simple distribution, development

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weighted

Higher weight = more requests. 
ultrabalancer -a weighted -b s1:8080:200 -b s2:8080:100
Best for: Backends with different capacities

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power-of-two

Picks 2 random backends, uses the one with fewer connections. 
ultrabalancer -a power-of-two -b s1:8080 -b s2:8080 -b s3:8080
Best for: High performance, distributed choice

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fastest-response

Routes to backend with fastest recent response. 
ultrabalancer -a fastest-response -b s1:8080 -b s2:8080
Best for: Latency-sensitive applications

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Quick Comparison

AlgorithmUse Case
round-robinDefault choice
least-connectionsLong requests
ip-hashSessions/sticky
weightedUnequal backends
power-of-twoPerformance
fastest-responseLatency-sensitive