Keepalived+NFS+SHELL脚本实现NFS-HA高可用
本来想做DRBD+HEARTBEAT，但是领导说再加硬盘浪费资源，没有必要，而且在已有硬盘上做风险较大，所以就只能用rsync来实现数据同步了，实验中发现很多的坑，都用脚本和计划任务给填上了，打算把这套直接用在生产环境中，到时候如果还遇到什么问题，再进行修正和补全，下面是项目细节：主机配置：
web:192.168.6.10 Centos 6.4
nfs1:192.168.6.1 Centos 6.4
nfs2:192.168.6.2 Centos 6.4
keepalived 1.2.13 VIP:192.168.6.105
1.安装NFS和keepalived
这部分比较简单，直接用yum -y install nfs keepalived
2.配置NFS(两台同样配置)
mkdir /home/shares
vim /etc/exports
/home/shares 192.168.6.0/24(rw,sync,no_root_squash)
cd /home/shares
echo aaa > /home/shares/a.txt #用作后面脚本判断
touch files{1..10}
service nfs start
3.配置keepalived
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER#辅改成BACKUP
interface eth0
virtual_router_id 51
priority 100 #辅改成50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.6.105
}
}
service keepalived start
web:mount -t nfs 192.168.6.105:/home/shares /shares
4.ssh免密登录
ssh-keygen
ssh-copy-id
5.shell脚本
cd /etc/keepalived
vim notify_master.sh #判断NFS端口是否存在，不存在就停止keepalived服务
#!/bin/bash
port=`netstat -anp|grep 2049`
if [ "$port" == "" ];then
/sbin/service keepalived stop
fi
vim change.sh（两台NFS都需要）
#!/bin/bash
ip=`/sbin/ip a|grep "eth0"|grep "105"`
web="192.168.6.10"
if [ "$ip" != "" ];then #判断VIP是否存在,如果存在就表示现在这台是master
/usr/bin/ssh $web "cat /shares/a.txt" #在web上运行命令，查看/shares目录是否可用,执行cat a.txt消耗内存cpu较小
if [ "$?" != 0 ];then #如果不可用$?返回值不为0，则卸载原来的/shares目录，再重新挂载这个目录，这样做的原因是，VIP切换的时候，必须重新挂载/shares，否则不能使用这个目录
/usr/bin/ssh $web "umount /shares&&mount -t nfs 192.168.6.105:/home/shares /shares"
fi
fi
chmod +x change.sh
chmod +x notify_master.sh
6.计划任务crontab
crontab -e
* * * * * /etc/keepalived/notify_master.sh #每分钟检查一次NFS服务是否正常
* * * * * /etc/keepalived/change.sh #每分钟检查一次keepalived状态
0 00 * * * rsync /home/shares 192.168.6.2:/home/shares #每天夜间同步数据
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