keepalived+nfs drbd

###实验环境：
nfs1 192.168.119.110 keepalived nfs drbd
nfs2 192.168.119.111 keepalived nfs drbd
vip 192.168.119.140
web 192.168.119.120 nginx

---

###安装软件：
在nfs1、nfs2上分别安装软件keepalived nfs drbd
drbd安装与配置 https://blog.csdn.net/harryxxxxx/article/details/80938951
keepalived安装与配置 https://blog.csdn.net/harryxxxxx/article/details/80803389
nfs安装与配置 https://blog.csdn.net/harryxxxxx/article/details/81078087
在web上安装nginx并配置 与nfs（做测试用）

---

###配置文件：

• keepalived

nfs1

! Configuration File for keepalived 

global_defs {                           #全局定义部分
    script_user root
    enable_script_security
    router_id NFS1                      #id_唯一标识
}
vrrp_script chk_nfs {
    script "/etc/keepalived/chk_nfs.sh"
    interval 3
    weight -20
    fall 3
}
vrrp_instance VI_1 {     
    state MASTER         
    interface ens32      
    virtual_router_id 61 
    priority 100         
    advert_int 1         
    authentication {     
        auth_type PASS
        auth_pass 1111
    }   
    virtual_ipaddress {  
        192.168.119.140
    }   
    track_script {
        chk_nfs
    }   
    notify_master /etc/keepalived/notify_master.sh
} 

nfs2

! Configuration File for keepalived 

global_defs {                           #全局定义部分
    script_user root
    enable_script_security
    router_id NFS2                      #id_唯一标识
}
vrrp_instance VI_1 {     
    state BACKUP         
    interface ens32      
    virtual_router_id 61 
    priority 90         
    advert_int 1         
    authentication {     
        auth_type PASS
        auth_pass 1111
    }   
    virtual_ipaddress {  
        192.168.119.140
    }   
    notify_master /etc/keepalived/notify_master.sh
    notify_backup /etc/keepalived/notify_backup.sh
} 

drbd 与nfs两个节点配置相同，参考安装文档，
nginx不在本文范围内

---

###用到的脚本:

vim chk_nfs.sh
#!/bin/bash
/usr/bin/systemctl status nfs >/dev/null
if [ $? -ne 0 ] ; then
    /usr/bin/systemctl restart nfs 
    /usr/bin/systemctl status nfs >/dev/null
    if [ $? -ne 0 ] ; then
        /usr/bin/systemctl stop nfs 
        /usr/bin/umount -lf /data 
        /usr/sbin/drbdadm secondary web 
        /usr/bin/kill -15 `cat /var/run/keepalived.pid`
        exit 1
    fi  
    exit 0
fi

vim notify_master.sh
#!/bin/bash
sleep 2
/usr/sbin/drbdadm primary web 
/usr/bin/mount /dev/drbd0 /data 
/usr/bin/systemctl restart nfs  

vim notify_backup.sh
#!/bin/bash                                                                                             
/usr/bin/umount -lf /data
/usr/sbin/drbdadm secondary web 
/usr/bin/systemctl stop nfs 

---

###测试：
nfs1上 将chk_nfs.sh中5 6 7 13 14行注释掉，然后停掉nfs服务，观察是否自动切换

    
由上两张图可知，vip已经漂移到nfs2上
    
查看drbd状态

    
同样可知 nfs2为主，nfs1为次
    
查看挂载情况


nfs1上 /data 已经被umount nfs2上挂载成功
    
测试机也能正常访问

    
####恢复nfs1上chk_nfs.sh脚本，然后启动keepalived，观察是否还原
同样先观察ip


vip 已经漂移回来
    
drbd状态


同样还原回nfs1为主 nfs2为次
    
挂载情况

同样还原回nfs1
    
测试链接同样正常