keepalived 使用注意事项
1、启动用service keepalived start/stop 比直接 /sbin/keepalived start/stop要好，貌似解决了master停止了keepalived服务而backup不会转换状态的问题；2、如果/var/log/messages出现
Keepalived_vrrp: Remote SMTP server connected.
Keepalived_vrrp: Can not read data from remote SMTP server .
的报错信息，很有可能是/etc/keepalived/keepalived.conf配置文件的问题（前提是exim4等邮件服务已开），不能这样写：
notification_email # To:
{
admin@example1.com
}
而要写成
notification_email{
admin@example1.com
}
notification_email与 { 之间必须要有空格。。
3、对于一备多主的机器，备机上要为每个instance配置一个 vrrp_sync_group，否则会导致只有一组主-备可以keepalived
4、用/usr/sbin/keepalived -f CONF_FILE启动会有问题，看keepalived.log会发现停在Using LinkWatch kernel netlink reflector…或Using autogen SSL context 这一步而没有读取vrrp_instance配置.需要用keepalived -f CONF_FILE才能读取到vrrp_instance配置，诡异的是which keepalived显示的就是/usr/sbin/keepalived
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