MySQL5.7+Keepalived双主HA架构
数据库架构：双主复制
master：192.168.8.57
slave1：192.168.8.58
keepalived工具包
keepalived-1.4.5.tar.gz
一、添加非本机IP绑定支持
echo "net.ipv4.ip_nonlocal_bind=1" >> /etc/sysctl.conf sysctl -p
二、下载并安装 keepalived
tar
zxvf keepalived-1.4.5.
tar
.gz
cd
keepalived-1.4.5
.
/configure
--prefix=
/usr/local/keepalived/
make
&&
make
install
keepalived 开机自动启动
systemctl enable keepalived
三、配置keepalived
192.168.8.57
# vi /etc/keepalived/keepalived.conf
! Configuration file for keepalived
global_defs {
router_id 8.57
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server stmp.163.com
smtp_connect_timeout 30
}
vrrp_script chk_mysql {
script "/etc/keepalived/check_mysql.sh"
interval 3
}
vrrp_instance V_mysql_1 {
state BACKUP
interface enp0s3
virtual_router_id 200
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass steven
}
track_script {
chk_mysql
}
virtual_ipaddress {
192.168.8.88/24
}
}
192.168.8.58
! Configuration file for keepalived
global_defs {
router_id 8.58
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server stmp.163.com
smtp_connect_timeout 30
}
vrrp_instance V_mysql_1 {
state BACKUP
interface enp0s3
virtual_router_id 200
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass steven
}
notify_master /etc/keepalived/notify_master_mysql.sh
virtual_ipaddress {
192.168.8.88/24
}
}
check_mysql.sh
#!/bin/bash
#/etc/keepalived/check_mysql.sh
#chmod u+x /etc/keepalived/check_mysql.sh
if [ `ps -ef|grep -w "$0"|grep "/bin/sh*"|grep "?"|grep "?"|grep -v "grep"|wc -l` -gt 2 ];then #
exit 0
fi
mysql_con='/usr/local/mysql/bin/mysql -uroot -pmysql'
function excute_query {
$mysql_con -e "select 1 from dual;" 2>>/mysql/log/check_mysql.err
}
function service_error {
echo -e "`date "+%F %H:%M:%S"` -----mysql service error，now stop keepalived-----" >> /mysql/log/check_mysql.err
/sbin/service keepalived stop &>> /mysql/log/check_mysql.err
echo -e "\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n" >> /mysql/log/check_mysql.err
}
function query_error {
echo -e "`date "+%F %H:%M:%S"` -----query error, but mysql service ok, retry after 30s-----" >> /mysql/log/check_mysql.err
sleep 30
excute_query
if [ $? -ne 0 ];then
echo -e "`date "+%F %H:%M:%S"` -----still can't execute query-----" >> /mysql/log/check_mysql.err
echo -e "`date "+%F %H:%M:%S"` -----set read_only = 1 on DB1-----" >> /mysql/log/check_mysql.err
$mysql_con -e "set global read_only = 1;" 2>> /mysql/log/check_mysql.err
echo -e "`date "+%F %H:%M:%S"` -----kill current client thread-----" >> /mysql/log/check_mysql.err
rm -f /mysql/log/kill.sql &>/dev/null
$mysql_con -NB -e 'select concat("kill ",id,";") from information_schema.PROCESSLIST where command="Query" or command="Execute"' > /mysql/log/kill.sql
$mysql_con -e "source /mysql/log/kill.sql"
sleep 2
echo -e "`date "+%F %H:%M:%S"` -----stop keepalived-----" >> /mysql/log/check_mysql.err
systemctl stop keepalived &>> /mysql/log/check_mysql.err
echo -e "\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n" >> /mysql/log/check_mysql.err
else
echo -e "`date "+%F %H:%M:%S"` -----query ok after 30s-----" >> /mysql/log/check_mysql.err
echo -e "\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n" >> /mysql/log/check_mysql.err
fi
}
excute_query
if [ $? -ne 0 ];then
service mysql status &>/dev/null
if [ $? -ne 0 ];then
service_error
else
query_error
fi
fi
notify_master_mysql.sh
#!/bin/bash
#/etc/keepalived/notify_master_mysql.sh
#chmod u+x /etc/keepalived/notify_master_mysql.sh
change_log=/mysql/log/state_change.log
slave_status_log=/mysql/log/slave_status_log.log
mysql_conn='/usr/local/mysql/bin/mysql -uroot -pmysql'
echo -e "`date "+%F %H:%M:%S"` -----keepalived change to MASTER-----" >> $change_log
echo -e "`date "+%F %H:%M:%S"` ----------" >> $slave_status_log
$mysql_conn -e "show slave status\G;" >> $slave_status_log
Slave_IO_Running=`$mysql_conn -e "show slave status\G;"|egrep -w "Slave_IO_Running|Slave_SQL_Running"|awk 'NR==1{print}' | awk '{print $2}'`
Slave_SQL_Running=`$mysql_conn -e "show slave status\G;"|egrep -w "Slave_IO_Running|Slave_SQL_Running"|awk 'NR==2{print}' | awk '{print $2}'`
Master_Log_File=`$mysql_conn -e "show slave status\G;" |egrep -w "Master_Log_File|Read_Master_Log_Pos|Exec_Master_Log_Pos"|awk 'NR==1{print}' | awk '{print $2}'`
Read_Master_Log_Pos=`$mysql_conn -e "show slave status\G;" |egrep -w "Master_Log_File|Read_Master_Log_Pos|Exec_Master_Log_Pos"|awk 'NR==2{print}' | awk '{print $2}'`
Exec_Master_Log_Pos=`$mysql_conn -e "show slave status\G;" |egrep -w "Master_Log_File|Read_Master_Log_Pos|Exec_Master_Log_Pos"|awk 'NR==3{print}' | awk '{print $2}'`
action() {
echo -e "`date "+%F %H:%M:%S"` -----set read_only = 0 on itpuxdb2-slave-----" >> $change_log
$mysql_conn -e "set global read_only = 0;" 2>> $change_log
$mysql_conn -e "stop slave;" 2>> $change_log
echo "slave1 keepalived转为MASTER状态，线上数据库切换至slave1"|/bin/mailx -s "slave1 keepalived change to MASTER"\
[email protected] 2>> $change_log
echo -e "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n" >> $change_log
}
if [ "$Slave_IO_Running" = "Yes" -a "$Slave_SQL_Running" = "Yes" ];then
if [ $Read_Master_Log_Pos = $Exec_Master_Log_Pos ];then
echo -e "`date "+%F %H:%M:%S"` -----Master_Log_File=$Master_Log_File . Exec_Master_Log_Pos($Exec_Master_Log_Pos) is equal Read_Master_Log_Pos($Read_Master_Log_Pos)" >> $change_log
action
$mysql_conn -e "reset slave all;" 2>> $change_log
else
echo -e "`date "+%F %H:%M:%S"` -----Master_Log_File=$Master_Log_File . Exec_Master_Log_Pos($Exec_Master_Log_Pos) is behind Read_Master_Log_Pos($Read_Master_Log_Pos), The waits time is more than 10s,now force change." >> $change_log
sleep 10
action
$mysql_conn -e "reset slave all;" 2>> $change_log
exit 0
fi
action
else
echo -e "itpuxdb2-slave's slave status is wrong,now force change. Master_Log_File=$Master_Log_File Read_Master_Log_Pos=$Read_Master_Log_Pos Exec_Master_Log_Pos=$Exec_Master_Log_Pos" >> $change_log
action
fi
四、启动 keepalived
systemctl daemon-reload systemctl enable keepalived systemctl stop keepalived systemctl start keepalived
查看keepalived进程
ps -ef|grep keepalived root 7406 1 0 20:25 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D -d -S 0 root 7407 7406 0 20:25 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D -d -S 0 root 7408 7406 0 20:25 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D -d -S 0 root 7412 3067 0 20:25 pts/2 00:00:00 grep --color=auto keepalived
看到这样的说明启动成功，否则启动失败
五、查看VIP状态
192.168.8.57
ip a |grep 88 inet 192.168.8.88/24 scope global secondary enp0s3
192.168.8.58则查询不到
六、通过VIP连接MySQL
mysql -uroot -pmysql -h192.168.8.88 -e "select @@hostname;" mysql: [Warning] Using a password on the command line interface can be insecure. +------------+ | @@hostname | +------------+ | master | +------------+
七、模拟宕机
关闭192.168.8.57服务器
mysql -uroot -pmysql -h192.168.8.88 -e "select @@hostname;" mysql: [Warning] Using a password on the command line interface can be insecure. +------------+ | @@hostname | +------------+ | slave1 | +------------+
MySQL连接切换成功，业务可正常切换至备机
八、故障恢复
192.168.8.57恢复之后，重新将该节点数据库加入至双主复制
reset slave;
change master to
master_host='192.168.8.58',
master_port=3306,
master_user='repl',
master_password='mysql',
master_auto_position=1;
start slave;
等数据追平之后，可以将vip切换至192.168.8.57
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转载于:http://blog.itpub.net/30135314/viewspace-2218136/