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线上将两台 lvs 服务器做 heartbeat 热备，但是配置启动后，发现报错：
Jan 28 15:50:22 usvr-211 heartbeat: [2266]: ERROR: should_drop_message: attempted replay attack [usvr-210]? [gen = 1418354318, curgen = 1418354319]
Jan 28 15:50:24 usvr-211 heartbeat: [2266]: WARN: nodename usvr-210 uuid changed to usvr-211
Jan 28 15:50:24 usvr-211 heartbeat: [2266]: WARN: nodename usvr-211 uuid changed to usvr-210
Jan 28 15:50:24 usvr-211 heartbeat: [2266]: ERROR: should_drop_message: attempted replay attack [usvr-210]? [gen = 1418354318, curgen = 1418354319]
Jan 28 15:50:26 usvr-211 heartbeat: [2266]: WARN: nodename usvr-210 uuid changed to usvr-211
Jan 28 15:50:26 usvr-211 heartbeat: [2266]: WARN: nodename usvr-211 uuid changed to usvr-210
Jan 28 15:50:26 usvr-211 heartbeat: [2266]: ERROR: should_drop_message: attempted replay attack [usvr-210]? [gen = 1418354318, curgen = 1418354319]
Jan 28 15:50:28 usvr-211 heartbeat: [2266]: WARN: nodename usvr-210 uuid changed to usvr-211
Jan 28 15:50:28 usvr-211 heartbeat: [2266]: WARN: nodename usvr-211 uuid changed to usvr-210
Jan 28 15:50:28 usvr-211 heartbeat: [2266]: ERROR: should_drop_message: attempted replay attack [usvr-210]? [gen = 1418354318, curgen = 1418354319]
Jan 28 15:50:30 usvr-211 heartbeat: [2266]: WARN: nodename usvr-210 uuid changed to usvr-211
Jan 28 15:50:30 usvr-211 heartbeat: [2266]: WARN: nodename usvr-211 uuid changed to usvr-210
Jan 28 15:50:30 usvr-211 heartbeat: [2266]: ERROR: should_drop_message: attempted replay attack [usvr-210]? [gen = 1418354318, curgen = 1418354319]
Jan 28 15:50:32 usvr-211 heartbeat: [2266]: WARN: nodename usvr-210 uuid changed to usvr-211
Jan 28 15:50:32 usvr-211 heartbeat: [2266]: WARN: nodename usvr-211 uuid changed to usvr-210
Jan 28 15:50:32 usvr-211 heartbeat: [2266]: ERROR: should_drop_message: attempted replay attack [usvr-210]? [gen = 1418354318, curgen = 1418354319]
Jan 28 15:50:34 usvr-211 heartbeat: [2266]: WARN: nodename usvr-210 uuid changed to usvr-211
Jan 28 15:50:34 usvr-211 heartbeat: [2266]: WARN: nodename usvr-211 uuid changed to usvr-210
原因：由于 usvr-211 是通过 vmware 克隆复制 usvr-210 得到的，因此这两台设备完全一样。
而有人说是由于这两台机器的 uuid 不同导致，需让 uuid 重新生成。而 uuid 这个文件默认安装在 /var/lib/heartbeat 下，卸载并不被删除，如果不手动删除，重新安装仍会使用原来的
的 uuid，因此删除后再重新安装果然 ok。
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基于 Heartbeat V1 实现 Web 服务双机热备 http://www.linuxidc.com/Linux/2014-04/100635.htm
Heartbeat 实现 Web 服务的高可用群集 http://www.linuxidc.com/Linux/2014-04/99503.htm
Heartbeat+LVS+Ldirectord 高可用负载均衡解决方案 http://www.linuxidc.com/Linux/2014-04/99502.htm
DRBD+Heartbeat+NFS 高可用性配置笔记 http://www.linuxidc.com/Linux/2014-04/99501.htm
Heartbeat 基于 CRM 使用 NFS 对 MySQL 高可用 http://www.linuxidc.com/Linux/2014-03/98674.htm
Heartbeat 高可用 httpd 基于 Resources 简单配置 http://www.linuxidc.com/Linux/2014-03/98672.htm
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