Ha High Availability Cluster

Ha High Availability Cluster

HA (high available) is highly available and is also known as dual-machine hot standby for critical business. Simple understanding, two machines Web1 and WEB2, Normal is Web1 provide services, WEB2 standby idle, when Web1 downtime or service outage, will automatically switch to WEB2 machine continue to provide services, WEB1 and WEB2 have a heartbeat line, check the other's survival status, mobile IP, Also known as VIP, is to provide services to the IP, under normal circumstances, VIP is configured on the WEB1, Web1 downtime, WEB2 will automatically configure the VIP. High-availability open source software has heartbeat and keepalived, where keepalived has load-balanced functionality.

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Ha High Availability Cluster