#允许远程root连接到mysql
grant all privileges on *.* to 'root'@'%' identified by '142857'with grant option; #也适用新建用户
grant all privileges on *.* to 'amo'@'%' identified by '123456'with grant option;
mysql -uroot -p142857 -e "grant all on *.* to 'root'@'%' identified by 'root';
flush privileges";
show variables like 'datadir';
select uuid();
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#配keepalived高可用+Mysql双主热备（主1，主2）
real_server只绑本机
vi /etc/keepalived/keepalived.etc
vi /mysql.sh
#!/bin/bash
pkill keepalived
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MYSQL_HA #标识，双主相同
}
vrrp_instance VI_1 {
state BACKUP #两台配置此处均是BACKUP
interface ens33
virtual_router_id 51 #主备相同
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.221.20
}
}
virtual_server 192.168.221.138 3306 {
delay_loop 2 #每个2秒检查一次real_server状态
#lb_algo wrr #LVS算法，用不到，我们就关闭了
#lb_kind DR #LVS模式,如果不关闭，备用服务器不能通过VIP连接主MySQL
persistence_timeout 60 #会话保持时间，同一IP的连接60秒内被分配到同一台真实服务器
protocol TCP
real_server 本机ip 3306 { #检测本地mysql，backup也要写检测本地mysql
weight 3
notify_down /mysql.sh #当mysql服down时，执行此脚本，杀死keepalived实现切换
TCP_CHECK {
connect_timeout 10 #连接超时时间
nb_get_retry 3 #重连次数
delay_before_retry 3 #重连间隔时间
connect_port 3306 #健康检查端口
}
}
}
mysql -uroot -p -h 漂移地址 -P3306
重启开启相应服务
主1创建数据表，查看主2是否同步
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或采用监测mysql端口来实现漂移地址
vrrp_script chk_mysql_port { #检测mysql服务是否在运行。有很多方式，比如进程，用脚本检测等等
script "/chk_mysql.sh" #这里通过脚本监测
interval 2 #脚本执行间隔，每2s检测一次
weight -5 #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5
fall 2 #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）
rise 1 #检测1次成功就算成功。但不修改优先级
}
track_script {
chk_mysql_port
}
}
vi /chk_mysql.sh
#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l)
if [ "${counter}" -eq 0 ]
then
/etc/init.d/keepalived stop
else
echo "running..." >> /opt/keepalived-running-info.log
sleep 5000
fi
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