HAclusters
HA clusters, short for high-availability clusters, are groups of computers that work together to keep services running despite failures. In an HA cluster, several servers share control of a service; if one node fails, another takes over automatically to minimize downtime. Clustering software manages resource allocation, health monitoring, failover, and recovery, while storage and networking support data integrity and connectivity.
A typical HA cluster includes: multiple nodes connected by a private network, shared or distributed storage,
How it works: nodes monitor each other and the services they host. When a problem is detected,
Architectures vary: active-passive (one active node, others in standby) or active-active (multiple nodes serving); shared storage
Limitations include added complexity, fencing requirements, and the need for thorough testing. When properly implemented, HA