Keepalived+nfs+shell Script Implementation Nfs-ha high availability

Originally wanted to do drbd+heartbeat, but the leader said to add hard disk waste of resources, not necessary, and in the existing hard disk to do a large risk, so it can only use rsync to achieve data synchronization, the experiment found a lot of pits, are filled with scripts and planning tasks, and intends to use this set directly in the production environment , then if you still encounter any problems, and then make corrections and completion, the following is the project details:

Host Configuration:

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. Installing NFS and Keepalived

This part is relatively simple, directly with Yum-y install NFS keepalived

2. Configuring NFS (two same configurations)

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. Configure 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 #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 192.168.6.1:/home/shares/shares

4.ssh Password-Free login

Ssh-keygen

Ssh-copy-id

5.shell Script

Cd/etc/keepalived

Vim notify_master.sh #判断NFS端口是否存在, stop keepalived service if not present

#!/bin/bash

port= ' Netstat-anp|grep 2049 '
If ["$port" = = ""];then
/sbin/service keepalived Stop
Fi

Vim change.sh (required for two NFS units)

#!/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, if it exists, it is now master.
/usr/bin/ssh $web "Cat/shares/a.txt" #在web上运行命令 to see if/shares directory is available, perform cat a.txt consume less memory CPU
If ["$?"! = 0];then #如果不可用 $? The return value is not 0, then uninstall the original/shares directory, and then mount the directory again, the reason is that the VIP switch must be re-mounted/shares, otherwise you cannot use this directory
/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. Scheduled Tasks 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 XX * * * rsync/home/shares 192.168.6.2:/home/shares #每天夜间同步数据

Keepalived+nfs+shell Script Implementation nfs-ha high availability