Keepalived
LVS Service availability is a program implemented based Keepalived VRRP protocol, which may be utilized to avoid a single point of failure. LVS will have a service 2 servers running Keepalived, a Taiwan-based server (MASTER), a backup server (BACKUP), but outside the performance of a virtual IP, the master server sends a specific message to the backup server, when backup server not receive this news, that is, when the primary server goes down, the backup server takes over the virtual IP, continue to provide services, thus ensuring high availability.
Keepalived availability
1、LVS+Keepalived
2、Nginx+Keepalived
3、HAproxy+Keepalived