What is Keepalived?

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Keepalived is an open-source service commonly used to ensure high availability for network services. It helps by monitoring the health of services and automatically switching over to a backup server if the primary server goes down. This process is known as failover. Keepalived works by using a protocol called VRRP (Virtual Router Redundancy Protocol) to create a virtual IP address that is shared between multiple servers. The virtual IP always points to the currently active (healthy) server, ensuring that users can access services without interruption, even if one server fails.

Keepalived constantly monitors the health of the primary server. If a failure is detected, it assigns the virtual IP address to a backup server, which takes over, keeping the service running smoothly.