mysql+keepalived

Posted 2020-08-07

mysql+keepalived

1.安装

# yum install -y openssl-devel popt-devel

# tar zxf keepalived-1.2.8.tar.gz

# cd keepalived-1.2.8

# ./configure --prefix=/usr/local/keepalived

# make && make install

2.将keepalived命令、启动脚本及配置文件复制到相应目录下并启动服务

# which keepalived

/usr/local/sbin/keepalived

# ln -s /usr/local/keepalived/sbin/keepalived /usr/bin/keepalived

# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig

# /etc/init.d/keepalived start

3.创建配置文件及检测脚本

# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

[email protected]

}

notification_email_from [email protected]

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script check_mysql {

script "/root/check_mysql.sh"

interval 2

weight 2

}

vrrp_instance VI_1 {

state MASTER #mysql2此处改为BACKUP

interface eth1

virtual_router_id 51

priority 100 #mysql此处改为90，或小于100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

check_mysql

}

virtual_ipaddress {

192.168.36.200/24 dev eth1

}

}

# check_mysql.sh

MYSQL=/usr/bin/mysql

MYSQL_HOST=localhost

MYSQL_USER=root

MYSQL_PASSWORD=redhat

$MYSQL -h $MYSQL_HOST -u $MYSQL_USER -p$MYSQL_PASSWORD -e "show status;" >/dev/null 2>&1

#$mysqlclient --host=$host --port=$port --user=$user --password=$password -e "show databases;" > /dev/null 2>&1

if [ $? == 0 ]

then

echo " $host mysql login successfully"

exit 0

else

#echo " $host mysql login faild" #若mysql关闭，则keepalived关闭

/etc/init.d/keepalived stop

exit 2

fi

4.数据库授权远程登录

# mysql -p

mysql> grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘redhat‘;

mysql> flush privileges;

# mysql -uroot -predhat -h192.168.36.200 #vip登录

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| cheungssh |

| discuz |

| mysql |

+--------------------+

4 rows in set (0.03 sec)

mysql> quit

Bye

5.检测

此时vip在mysql1的eth1上，且两端的mysql、keepalived均开启

# ip a

eth1:

inet 192.168.36.160/24 brd 192.168.36.255 scope global eth1

inet 192.168.36.200/24 scope global secondary eth1

# /etc/init.d/mysqld status

mysqld (pid 7219) is running...

# /etc/init.d/keepalived status

keepalived (pid 7248) is running...

MYSQL1端：关闭mysql1的mysql服务，keepalived会自动关闭且vip飘在mysql2上

# /etc/init.d/mysqld stop

Stopping mysqld: [ OK ]

# /etc/init.d/mysqld status

mysqld is stopped

# /etc/init.d/keepalived status

keepalived is stopped

MYSQL2端：查看vip

# ip a

eth1:

inet 192.168.36.161/24 brd 192.168.36.255 scope global eth1

inet 192.168.36.200/24 scope global secondary eth1

MYSQL1端：开启mysql、keepalived服务，vip飘回来

# /etc/init.d/mysqld start

Starting mysqld: [ OK ]

# /etc/init.d/keepalived start

Starting keepalived: [ OK ]

# ip a

2: eth1:

inet 192.168.36.160/24 brd 192.168.36.255 scope global eth1

inet 192.168.36.200/24 scope global secondary eth1

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