keepalived 高可用问题及企业解决方案实战
keepalived 实现服务器级别的接管，比如nginx 宕机了 不会接管，可以写shell 脚本实现，当nginx 挂了，把keepalived 停掉while true
do
if [ 'ps -ef|grep nginx|grep -v grep|wc -l' -lt 2 ]
then
/etc/init.d/keepalived stop
fi
sleep 5
done
sh check_web.sh &
测试 ，pkill nginx
高可用裂脑问题解决
写脚本判断是否裂脑
vim check_split_brain.sh
while true
do
ping -c 2 -W 3 10.0.0.7 &>/dev/null (ping 两次，超时3秒，ping主节点)
if [ $? -e 0 -a 'ip addr|grep 10.0.0.17|wc -l' -eq 1 ](ping 通，并且备节点有 vip等于1，裂脑了)
then
echo "ha is split brain.warning."
else
echo "ha is ok."
fi
sleep 5
done
0.7
/app/nginx/sbin/nginx
/etc/init.d/keepalived start
ip add|grep 10.0.0.17
/etc/init.d/iptables start
0.8
/etc/init.d/iptables start
ip add|grep 10.0.0.17
sh check_split_brain.sh裂脑了（有两个主机上，有vip说明裂脑了）
两台防火墙都关掉，就正常了
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