How Keepalived Enables Automatic Failover and Load Balancing for High‑Availability Clusters
Keepalived, built on LVS, automatically monitors service nodes, isolates failed machines, and performs seamless failover between load balancers using VRRPv2, allowing web servers to be added or removed without manual intervention, thus ensuring high availability and efficient load distribution.
Keepalived is a robust high‑availability solution that runs on top of LVS, primarily providing fault isolation for real servers and failover between load balancers.
It continuously monitors the status of each service node by checking the third, fourth, and fifth layers of the TCP/IP model.
If a web server crashes or malfunctions, Keepalived detects the failure, automatically removes the faulty server from the pool, and reintegrates it once it recovers, all without human intervention.
Main features
Keepalived is an extension of LVS, ensuring strong compatibility.
Configuration is simple; a single configuration file is sufficient compared with Heartbeat.
Health checks on server‑pool objects provide fault isolation for failed machines/services.
Failover between load balancers is implemented via the VRRPv2 (Virtual Router Redundancy Protocol) stack, originally designed to eliminate single points of failure in static routers.
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