Mysql+Keepalived双主热备高可用操作记录

Posted 2021-03-25 菜鸟大数据

mysql+Keepalived双主热备高可用操作记录

环境:

ubuntu18.04.2

mysql5.7.21

 1 #1）安装keepalived并将其配置成系统服务。master1和master2两台机器上同样进行如下操作：
 2 apt-get install libssl-dev
 3 apt-get install openssl
 4 apt-get install libpopt-dev
 5 [root@master1 ~]# cd /usr/local/src/
 6 [root@master1 src]# wget http://www.keepalived.org/software/keepalived-1.3.5.tar.gz
 7 [root@master1 src]# tar -zvxf keepalived-1.3.5.tar.gz
 8 [root@master1 src]# cd keepalived-1.3.5
 9 [root@master1 keepalived-1.3.5]# ./configure --prefix=/usr/local/keepalived
10 [root@master1 keepalived-1.3.5]# make && make install
11 mkdir /etc/sysconfig
12 cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
13 cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
14 cp /usr/local/keepalived/sbin/keepalived /sbin/
15 mkdir /etc/keepalived
16 cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

实现高可用之前确保自己的mysql已经是主备或者互为主备了,mysql互为主备操作请看我上篇文章: https://www.cnblogs.com/-admin-/p/11654318.html

本次设置的ip:
vip:192.168.85.142
01:192.168.85.140
02:192.168.85.141

请各位按照自己的需求更改相应ip

#01的keepalived.conf配置
! Configuration File for keepalived
       
global_defs {
notification_email {
    [e-mail]
#报警邮件接收人的地址
}
       
notification_email_from [e-mail]
smtp_server 127.0.0.1 
smtp_connect_timeout 30
ubuntu001
}
       
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 "/opt/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
}
       
vrrp_instance VI_1 {
    state MASTER    
    interface ens33      
    #指定虚拟ip的网卡接口
    mcast_src_ip 192.168.85.140
    virtual_router_id 51    
    #路由器标识，MASTER和BACKUP必须是一致的
    priority 101            
    #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级。这样MASTER故障恢复后，就可以将VIP资源再次抢回来 
    advert_int 1         
    authentication {   
        auth_type PASS 
        auth_pass 123456     
    }
    virtual_ipaddress {    
        192.168.85.142
    }
      
track_script {               
   chk_mysql_port             
}
}

01服务器配置完毕.

接下来配置02服务器:

#02的keepalived.conf配置
! Configuration File for keepalived
       
global_defs {
notification_email {
    [e-mail]
#报警邮件接收人的地址
}
       
notification_email_from [e-mail]
smtp_server 127.0.0.1 
smtp_connect_timeout 30
ubuntu002
}
       
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 "/opt/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
}
       
vrrp_instance VI_1 {
    state BACKUP    
    interface ens33      
    #指定虚拟ip的网卡接口
    mcast_src_ip 192.168.85.141
    virtual_router_id 51    
    #路由器标识，MASTER和BACKUP必须是一致的
    priority 99            
    #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级。这样MASTER故障恢复后，就可以将VIP资源再次抢回来 
    advert_int 1         
    authentication {   
        auth_type PASS 
        auth_pass 123456     
    }
    virtual_ipaddress {    
        192.168.85.142
    }
      
track_script {               
   chk_mysql_port             
}
}

编写脚本:

#vi /opt/chk_mysql.sh
#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l)
if [ "${counter}" -eq 0 ]; then
    /etc/init.d/keepalived stop
fi

至此,Mysql+Keepalived双主热备高可用已经配置完毕.