mysql命令大全_Keeplived+mysql双master高可用如何实现？

作者：墨篱弦

简易拓扑

https://oscimg.oschina.net/oscnet/up-18b70e55451e4e69d0f449e6329034bdcfa.png

实验环境

 Mysql40.11(master-1)    192.168.40.11/24  Mysql40.12(master-2)    192.168.40.12/24   Keepalived    192.168.40.18/24

安装依赖环境和mysql(过程略)

配置master-1和master-2互为主从关系

修改master-1的mysql配置

vim /etc/my.cnf

#log configlog-bin=mysql-binrelay-log=relay-logrelay-log-index=relay-log.indexserver-id=11innodb-file-per-table=ONskip_name_resolve=ON

重启数据库

systemctl restart mysqld

连接数据库

mysql -uroot -p******

查看日志信息

show global variables like '%log%';

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https://oscimg.oschina.net/oscnet/up-52bdc44bcc14d0b72aefc988ae4093ca146.png

在master-1创建有复制权限的用户

grant replication slave on *.* to 'backup'@'%' identified by 'Backup123!@#';

flush privileges;

修改master-2的mysql配置

vim /etc/my.cnf

#log configlog-bin=log-binrelay-log=relay-logrelay-log-index=relay-log.indexserver-id=12innodb_file_per_table=ONskip_name_resolve=ON

在master-2创建有复制权限的用户

grant replication slave on *.* to 'backup'@'%' identified by 'Backup123!@#';

flush privileges;

重启数据库

systemctl restart mysqld

连接数据库

mysql -uroot -p123456

查看日志信息

show global variables like '%log%';

在master-1上查看log-bin文件名和pos值

show master status;

在master-2上开启主从

mysql> change master to    -> master_host='192.168.40.11',     -> master_user='backup',     -> master_password='Backup123!@#',     -> master_log_file='mysql-bin.000001',    -> master_log_pos=591;

start slave;

查看主从状态

show slave status\G

master-1与master-2主从关系建立成功

同理现在创建master-2与master-1的主从关系

在master-2上查看log-bin文件名和pos值

show master status;

在master-1上开启主从

mysql> change master to    -> master_host='192.168.40.12',     -> master_user='backup',     -> master_password='Backup123!@#',     -> master_log_file=' log-bin.000003',    -> master_log_pos=591;

start slave;

查看主从状态

验证master-1和master-2是否互为主从

创建远程访问账号

grant all privileges on *.*to 'test'@'%'  identified by '123qwe!@#QWE' with grant option;

端口为默认端口号

show global variables like '%port%';

在master-1创建新库 123

在master-2上查看数据库是否同步过来

在master-2上的数据库123上创建新表321

在master-1上的数据库123查看是否同步过来了新表

验证通过，master-1和master-2互为主从关系

在两台服务器上分别安装keepalived(过程略)

给master-1和master-2分别安装keepalived

Master-1安装keepalived

安装依赖坏境

yum -y install curl gcc openssl-devel libnl3-devel net-snmp-devel libnfnetlink-devel

创建/data/keepalived，创建/software

mkdir –p /data/keepalivedmkdir –p /software

上传安装包到/software, 解压安装包, 进入keepalived-2.1.5目录

tar -zxvf keepalived-2.1.5.tar.gzcd keepalived-2.1.5

编译安装

./configure --prefix=/data/keepalived --sysconf=/etcmake & manke install

进入安装后的路径

cd /data/keepalived/

创建软连接，覆盖软连接

ln -s sbin/keepalived /sbin/ln -snf sbin/keepalived /sbin

复制运行命令

cp /software/keepalived-2.1.5/keepalived/etc/init.d/keepalived /etc/init.dchkconfig --add keepalived

添加到系统服务(开机启动)，启动服务

chkconfig keepalived onservice keepalived start

Master-2安装和master-1相同

在master-1上创建chk_mysqld检测mysql是否运行的脚本，添加脚本执行权限

vim chk_mysqld.sh

#!/bin/bashA=`ps -C mysqld --no-header|wc -l`  if [ $A -eq 0 ];then     systemctl start mysqld  sleep 2   if [ `ps -C mysqld --no-header|wc -l` -eq 0 ];then       killall keepalived   fi fi

chmod 775 chk_mysqld.sh

配置master-1的keepalived

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   router_id MYSQL

   }

vrrp_script chk_mysqld {

       script "/root/chk_mysqld.sh"

       interval 10

       weight -5

}

vrrp_instance VI_1 {

    state BACKUP

    interface ens33

    virtual_router_id 18

    priority 100

    advert_int 1

    nopreempt

    authentication {

        auth_type PASS

        auth_pass 1111

        }

    virtual_ipaddress {

        192.168.40.18/24

        }

        track_script {

           chk_mysqld

        }

}

重启keepalived，查看是否拿到虚拟IP

service keepalived restartip add

在master-2上创建chk_mysqld检测mysql是否运行的脚本，添加脚本执行权限

vim chk_mysqld.sh

#!/bin/bashA=`ps -C mysqld --no-header|wc -l`  if [ $A -eq 0 ];then     systemctl start mysqld  sleep 2   if [ `ps -C mysqld --no-header|wc -l` -eq 0 ];then       killall keepalived   fi fi

chmod 775 chk_mysqld.sh

配置master-2的keepalived

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalivedglobal_defs {   router_id MYSQL   }

vrrp_script chk_mysqld {       script "/root/chk_mysqld.sh"       interval 10   }

vrrp_instance VI_1 {    state BACKUP    interface ens33    virtual_router_id 18    priority 99    advert_int 1    authentication {        auth_type PASS        auth_pass 1111        }

virtual_ipaddress {        192.168.40.18/24        }

 track_script {           chk_mysqld        }

}

重启keepalived，查看是否拿到虚拟IP

service keepalived restartip add    #因为设置了非抢占，默认谁优先开机启动完成，谁为主库，谁拿到vip

验证keepalived的非抢占

重启master-1并查看master网络信息

在查看master-1网络信息

验证数据库

目前主库在40.12

重启master-2看数据库是否会自动切换到master-1上

数据库发生了切换期间出现过一次丢包

对数据的影响还未验证。。

还可以测试下，如果直接down网口的情况下服务器以及数据库是否能实现自动切换？

Nginx+keepalived一主一从高可用，手把手带你一步一步配置！

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