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Keepalived

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description Keepalived Overview

Keepalived is an open source Linux software package designed for high availability environments. It manages Virtual IP addresses using TCP/IP health checks to ensure service continuity. Primarily used by system administrators and IT professionals implementing disaster recovery strategies, it’s often integrated with solutions like Zerto replication or vrrp for automated failover protection.

help Keepalived FAQ

How does Keepalived implement VRRP failover between servers?

Keepalived implements the Virtual Router Redundancy Protocol (VRRP), defined in RFC 5798, which allows multiple servers to share a virtual IP address. One server acts as the master holding the VIP, and if it fails, a backup server automatically assumes the VIP to maintain service continuity.

Does Keepalived support TCP and HTTP health checks?

Keepalived supports TCP_CHECK, HTTP_GET, and SSL_GET health check methods, allowing it to verify service availability at the application layer. If a health check fails, Keepalived can remove the affected real server from the IPVS load balancing pool or trigger a VRRP failover.

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