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76What Is a Load Balancer?
77Why Load Balancers Are Necessary
78Load Balancer Placement in Architecture
79Hardware vs Software Load Balancers
80Layer 4 vs Layer 7 Load Balancing
81Single Point of Failure: Load Balancer HA
82DNS-Based Load Balancing
83Client-Side Load Balancing
84Load Balancer Performance Metrics
85Round Robin Algorithm
86Weighted Round Robin
87Least Connections Algorithm
88Weighted Least Connections
89IP Hash Algorithm
90Consistent Hashing for Load Balancing
91Random Selection Algorithm
92Least Response Time Algorithm
93Resource-Based Algorithms
94Session Affinity (Sticky Sessions)
95Geographic/Proximity-Based Routing
96Algorithm Selection Tradeoffs
97Dynamic Algorithm Selection
98What Are Health Checks?
99Active vs Passive Health Checks
100Health Check Intervals and Timeouts
101Health Check Endpoints
102Shallow vs Deep Health Checks
103Marking Servers Unhealthy
104Failover Fundamentals
105Graceful Degradation and Circuit Breaking
106Health Check False Positives and Flapping
107Monitoring Health Check Metrics
108Hardware vs Software Load Balancers
109Layer 4 (Transport) Load Balancing
110Layer 7 (Application) Load Balancing
111NGINX as a Load Balancer
112HAProxy Overview
113Cloud Load Balancers (AWS ELB/ALB)
114Cloud Load Balancers (GCP and Azure)
115Envoy Proxy Architecture
116DNS-Based Load Balancing
117Global Server Load Balancing (GSLB)
118SSL/TLS Termination at Load Balancers
119Choosing Load Balancer Technology

76What Is a Load Balancer?
77Why Load Balancers Are Necessary
78Load Balancer Placement in Architecture
79Hardware vs Software Load Balancers
80Layer 4 vs Layer 7 Load Balancing
81Single Point of Failure: Load Balancer HA
82DNS-Based Load Balancing
83Client-Side Load Balancing
84Load Balancer Performance Metrics
85Round Robin Algorithm
86Weighted Round Robin
87Least Connections Algorithm
88Weighted Least Connections
89IP Hash Algorithm
90Consistent Hashing for Load Balancing
91Random Selection Algorithm
92Least Response Time Algorithm
93Resource-Based Algorithms
94Session Affinity (Sticky Sessions)
95Geographic/Proximity-Based Routing
96Algorithm Selection Tradeoffs
97Dynamic Algorithm Selection
98What Are Health Checks?
99Active vs Passive Health Checks
100Health Check Intervals and Timeouts
101Health Check Endpoints
102Shallow vs Deep Health Checks
103Marking Servers Unhealthy
104Failover Fundamentals
105Graceful Degradation and Circuit Breaking
106Health Check False Positives and Flapping
107Monitoring Health Check Metrics
108Hardware vs Software Load Balancers
109Layer 4 (Transport) Load Balancing
110Layer 7 (Application) Load Balancing
111NGINX as a Load Balancer
112HAProxy Overview
113Cloud Load Balancers (AWS ELB/ALB)
114Cloud Load Balancers (GCP and Azure)
115Envoy Proxy Architecture
116DNS-Based Load Balancing
117Global Server Load Balancing (GSLB)
118SSL/TLS Termination at Load Balancers
119Choosing Load Balancer Technology

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Lesson 98 of 1,919·3. Load BalancingPro lesson

What Are Health Checks?

Health checks are periodic tests that load balancers perform to verify backend servers are operational and ready to handle traffic.

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