rockylinux 9.3详细安装drbd+keepalived

drbd参考上一篇博客
先明确主服务器的keepalivde的配置

drbd关闭时执行的脚本
keepalivde关闭时执行的脚本
故障恢复主服务器自动抢回vip的脚本
脚本记得给执行权限

从服务器的keepalivde的配置

主服务器失效后，从服务器自动挂载，并且成为主服务器，vip也会跟随过来。
原主服务器正常后，主服务器自动降为从服务器，并且取消挂载，vip也会自动转移走。

两台主机操作

drbdadm status   #确定drbd正常工作
dnf install -y keepalived

alpha节点操作
/etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id DRBD_HA_MASTER
}

vrrp_script chk_drbd {
    script "/etc/keepalived/check_drbd.sh"
    interval 5
}

vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        chk_drbd
    }

    notify_stop /etc/keepalived/notify_stop.sh    ### keepalived服务关闭执行的脚本
    notify_master /etc/keepalived/notify_master.sh    ### 重新拿回 master 的脚本
    virtual_ipaddress {
        192.168.110.88   ### vip 请选择一个没有在占用的IP地址
    }
}

通过上面的配置文件，这里需要编写三个脚本，如下：
/etc/keepalived/check_drbd.sh

#!/bin/bash
# Author:hukey
systemctl is-active --quiet drbd
if [ $? -ne 0 ]; then
    systemctl start drbd
    if [ $? -ne 0 ]; then
        umount /mnt
        drbdadm secondary drbd0
        systemctl stop keepalived
    fi
fi

/etc/keepalived/notify_stop.sh

#!/bin/bash
# Author:hukey
time=`date "+%F  %H:%M:%S"`
echo -e "$time  ------notify_stop------\n" >> /etc/keepalived/logs/notify_stop.log
umount /mnt
drbdadm secondary drbd0
/usr/sbin/fuser -k /mnt &>> /etc/keepalived/logs/notify_stop.log
/bin/umount /mnt &>> /etc/keepalived/logs/notify_stop.log
echo -e "\n" >> /etc/keepalived/logs/notify_stop.log

/etc/keepalived/notify_master.sh

#!/bin/bash
# Author:hukey
time=`date "+%F  %H:%M:%S"`
echo -e "$time  ------notify_master------\n" >> /etc/keepalived/logs/notify_master.log
systemctl start drbd &>> /etc/keepalived/logs/notify_master.log
for (( i=1; i <=3; i++))
do
    drbdadm status | egrep -q 'Primary'
    if [ $? -ne 0 ]; then
        mount /mnt
        drbdadm primary drbd0
        /bin/mount /dev/drbd0 /mnt &>> /etc/keepalived/logs/notify_master.log
        break
    else
        sleep 3
    fi
done
echo -e "\n" >> /etc/keepalived/logs/notify_master.

脚本所需目录和命令

yum install -y psmisc
mkdir -pv /etc/keepalived/logs

------------------------alpha节点操作完毕------------------------
bravo节点操作
/etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id DRBD_HA_BACKUP
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    notify_master /etc/keepalived/notify_master.sh
    notify_backup /etc/keepalived/notify_backup.sh 
    virtual_ipaddress {
        192.168.110.88
    }
}

/etc/keepalived/notify_master.sh

#!/bin/bash
# Author:hukey
time=`date "+%F  %H:%M:%S"`
echo -e "$time  ------notify_master------\n" >> /etc/keepalived/logs/notify_master.log
systemctl start drbd &>> /etc/keepalived/logs/notify_master.log
for (( i=1; i <=3; i++))
do
    drbdadm status | egrep -q 'Primary'
    if [ $? -ne 0 ]; then
        drbdadm primary drbd0
        mount /dev/drbd0 /mnt
        /bin/mount /dev/drbd0 /mnt &>> /etc/keepalived/logs/notify_master.log
        break
    else
        sleep 3
    fi
done
echo -e "\n" >> /etc/keepalived/logs/notify_master.log

/etc/keepalived/notify_backup.sh

#!/bin/bash
# Author:hukey
time=`date "+%F  %H:%M:%S"`
echo -e "$time  ------notify_backup------\n" &>> /etc/keepalived/logs/notify_backup.log
umount /mnt
drbdadm secondary drbd0
/usr/sbin/fuser -k /data &>> /etc/keepalived/logs/notify_backup.log
/bin/umount /dev/drbd0 &>> /etc/keepalived/logs/notify_backup.log
echo $time
echo -e "\n" &>> /etc/keepalived/logs/notify_backup.log

启动服务 两台主机操作

#开机自启
systemctl enable drbd keepalived
systemctl restart drbd keepalived

启动后查看 alpha 节点 VIP 和 目录是否挂载：


注意：
​ 如果发现 vip 或者 drbd 没有挂载，检查一下配置文件是否有问题。

测试
1.关闭 alpha 节点 keepalived 服务

systemctl stop keepalived

2.查看 bravo 节点是否升级为主节点

3.alpha开启节点 keepalived 服务 bravo 节点关闭keepalived 服务

如果vip会自动漂移和会自动挂载就说明成功了

还有一个可以测试的，主服务器systemctl stop drbd,五秒后使用systemctl status drbd查看，如果已经启动说明脚本基本没问题。

最后drbd+keepalived就完成了，还可以加上nfs。nfs比较简单就不写了。。。