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Linux-HA Heartbeat
Port 694 is assigned to the Linux-HA project's Heartbeat component, a messaging layer that facilitates high-availability clustering in Linux environments. Heartbeat monitors and manages communication between cluster nodes, maintaining failover operations and resource management to ensure system uptime..
Linux-HA Heartbeat is a core process within the Linux-HA project designed to provide reliable messaging and node state monitoring within a clustered environment. It transmits periodic heartbeat signals over the network on port 694, enabling nodes to detect failures through missed messages. Heartbeat manages cluster membership using these signals, supporting both unicast and multicast communication via TCP and UDP.
Heartbeat coordinates failover activities, automatically reassigning resources such as IP addresses and file systems when a node becomes unresponsive. This orchestration ensures service continuity with minimal downtime, which is crucial for mission-critical systems. Heartbeat is often integrated with other cluster resource managers like Pacemaker for more advanced resource control and monitoring.
Port 694 usage is typically found in enterprise Linux deployment scenarios where high availability is necessary—such as web servers, databases, and network services. Since both TCP and UDP protocols are used, configuring proper firewall and network rules is essential to maintain reliable cluster communication without interruptions.