Load Balancer Automatic Failover via Health Checks
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Solution Overview
Problem
In server arrangements like data centers, manual intervention is often required to address failed servers, leading to downtime as proficient personnel may not be available immediately, causing services to be unavailable for extended periods.
Innovation Solution
A load balancer is configured to detect service failures and automatically enable a secondary server to take over, using failover rules and health checks to minimize downtime without human intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual intervention is used to repair failed servers, then service availability can be restored, but downtime increases due to delayed human response
Solution Approach 1:
The system performs preliminary actions by pre-configuring failover rules that define secondary servers and services before failures occur. When a failure is detected, the load balancer automatically executes the pre-planned failover action, eliminating the need for human intervention and reducing downtime.
Solution Approach 2:
The load balancer implements self-service by automatically detecting server failures through health checks and autonomously executing failover operations based on configured rules. This self-managed process eliminates dependency on human operators, ensuring immediate response to failures and maintaining service availability.
2Loss of time
If automatic failover is implemented, then downtime is reduced, but system complexity increases due to load balancer configuration requirements
Solution Approach 1:
The system manages complexity by parameterizing the failover configuration through structured rules that define services, servers, and failover conditions. This parameterized approach allows automatic failover functionality to be controlled through configurable parameters rather than hard-coded logic, making the system adaptable while maintaining automation.
Data Source
AI summary
A load balancer includes a failover logic unit to identify servers to execute services, generate and store in the load balancer a failover rule and a service rule, and to determine a failure in a first server that executes a first service responsive to a lack of response by the first server to a keepalive message sent by the load balancer to the first server. The load balancer can then perform an operation to cause an automatic failover of the first service to another server based on the failover and service rules.