负载均衡架构方案 负载均衡器 1、硬件负载均衡 F5 BIG-IP Citrix NetScaler Array 2、软件负载均衡 LVS Nginx及HAProxy 3、高可用软件 Heartbeat Keepalived Linux集群架构 DNS轮询 LVS + Keepalived Nginx/HAProxy + Keepalived DRBD + Heartbeat