mysqld_multi+keepalived高可用实践

系统环境Centos6.3x64

拓扑如下

一、配置mysql（四台都安装）

1.安装mysql

#./lnmp.shinstallmysql

mysql安装目录为/home/soft/mysql

为mysql添加默认搜索路径

#exportPATH=$PATH:/home/soft/mysql/bin

#echo“exportPATH=$PATH:/home/soft/mysql/bin”>>/etc/profile

2.创建数据存放目录和日志存放目录,并修改目录权限

#mkdir-p/home/data/dbdata

#cd/home/data/dbdata/

#mkdir/data_3306data_3307data_3308data_3309logs

#chownmysql.mysql-R.

3.初始化数据库

#/home/soft/mysql/scripts/mysql_install_db--basedir=/home/soft/mysql--datadir=/home/data/dbdata/data_3306--user=mysql

#/home/soft/mysql/scripts/mysql_install_db--basedir=/home/soft/mysql--datadir=/home/data/dbdata/data_3307--user=mysql

#/home/soft/mysql/scripts/mysql_install_db--basedir=/home/soft/mysql--datadir=/home/data/dbdata/data_3308--user=mysql

#/home/soft/mysql/scripts/mysql_install_db--basedir=/home/soft/mysql--datadir=/home/data/dbdata/data_3309--user=mysql

初始化完成后，查看data_3306,data_3307,data_3308,data_3309目录下是否生成数据

4.编辑/etc/my.cnf配置文件

#vim/etc/my.cnf

[mysqld_multi]

mysqld=/home/soft/mysql/bin/mysqld_safe

mysqladmin=/home/soft/mysql/bin/mysqladmin

[mysqld1]

port=3306

basedir=/home/soft/mysql

datadir=/home/data/dbdata/data_3306

pid-file=/home/data/dbdata/data_3306/mysql_3306.pid

socket=/home/data/dbdata/data_3306/mysql_3306.sock

log_error=/home/data/dbdata/logs/mysql_3306_error.log

user=mysql

[mysqld2]

port=3307

basedir=/home/soft/mysql

datadir=/home/data/dbdata/data_3307

pid-file=/home/data/dbdata/data_3307/mysql_3307.pid

socket=/home/data/dbdata/data_3306/mysql_3307.sock

log_error=/home/data/dbdata/logs/mysql_3307_error.log

user=mysql

[mysqld3]

port=3308

basedir=/home/soft/mysql

datadir=/home/data/dbdata/data_3308

pid-file=/home/data/dbdata/data_3308/mysql_3308.pid

socket=/home/data/dbdata/data_3308/mysql_3308.sock

log_error=/home/data/dbdata/logs/mysql_3308_error.log

user=mysql

[mysqld4]

port=3309

basedir=/home/soft/mysql

datadir=/home/data/dbdata/data_3309

pid-file=/home/data/dbdata/data_3309/mysql_3309.pid

socket=/home/data/dbdata/data_3309/mysql_3309.sock

log_error=/home/data/dbdata/logs/mysql_3309_error.log

user=mysql

启动服务并查看

#mysqld_multistart1

#ps-ef|grepmysql

启动3307,3308,3309

#mysqld_multistart2,3,4

登陆查看

#mysql-uroot-h127.0.0.1-P3306

或者

#mysql-uroot-S/home/data/dbdata/data_3306/mysql_3306.sock

关闭服务,对应启动的数字

#mysqld_multistop1

6.配置mysql主主同步（现在配置master1为主，master2为从）

修改my.cnf主要设置个不一样的ID(mysql_master1)

#vim/etc/my.cnf

[mysqld1],[mysqld2],[mysqld3],[mysqld4]中加入内容如下

server-id=1

log-bin=binlog

replicate-ignore-db=test#这是指定不需要同步的数据库

replicate-ignore-db=information_schema

replicate-ignore-db=performance_schema

重启服务使配置生效

#mysqld_mulitstop1-4

#mysqld_mulitstart1-4

登陆主库master1赋予master2权限账号

#mysql-uroot-h127.0.0.1-P3306#分别登陆3306,3307,3308,3309

grantreplicationslaveon*.*to'admin'@'192.168.240.83'identifiedby'Pwd.123.!@#';

为验证账号我们可以在master2的机器上用命令做如下测试

mysql-uadmin-p’Pwd.123.!@#’-h192.168.240.82

显示主库信息

showmasterstatus；(记录file、position,从库设置将会用到)

修改master2配置文件my.cnf

在下面字段添加

[mysqld1],[mysqld2],[mysqld3],[mysqld4],

server-id=2

在master2上设置同步

#mysql–uroot-h127.0.0.1–P3306

mysql>stopslave;

changemasterto

master_host='192.168.240.82',master_user='admin',master_password='Pwd.123.!@#',master_log_file='binlog.000001’,master_log_pos=120;

mysql>startslave;

查看从库状态

mysql>showslavestatus\G

说明已经于主库同步

测试，在master1上面创建一个库，看master2是否同步过来

如果能看到主库中建立的库那么表示成功同步了

这里才是主主复制的开始，我们之前可以实现主从复制也就是说，再把从做为主，主再做为从，就实现主主复制了

7.编辑master2，my.cnf配置文件

vim/etc/my.cnf

[mysqld1],[mysqld2],[mysqld3],[mysqld4]中加入内容如下

log-bin=binlog

replicate-ignore-db=test

replicate-ignore-db=information_schema

replicate-ignore-db=performance_schema

重启数据库使配置生效

#mysqld_multistop1-4

#mysqld_multistart1-4

登录master2数据库赋予master数据库权限账号

#mysql-uroot-h127.0.0.1-P3306#分别登陆3306,3307,3308,3309

grantreplicationslaveon*.*to'admin'@'192.168.240.82'identifiedby'Pwd.123.!@#';

master2上登录数据库查看file和position

在master1上登录数据库做如下配置

#mysql-uroot-h127.0.0.1-P3306#分别登陆3306,3307,3308,3309

mysql>stopslave;

changemasterto

master_host='192.168.240.83',master_user='admin',master_password='Pwd.123.!@#',master_log_file='binlog.000001’,master_log_pos=411;

mysql>startslave;

查看从库状态

mysql>showslavestatus\G

看到上两个进程为数据库与另一边的master已经建立连接

8.配置mysql_slave1

登录master1数据库赋予slave1数据库权限账号

#mysql-uroot-h127.0.0.1-P3306#分别登陆3306,3307,3308,3309

grantreplicationslaveon*.*to'admin'@'192.168.240.84'identifiedby'Pwd.123.!@#';

master1上登录数据库查看file和position

登陆slave1，修改my.cnf

#vim/etc/my.cnf

[mysqld1],[mysqld2],[mysqld3],[mysqld4]中加入内容如下

server-id=3

log-bin=binlog

replicate-ignore-db=test

replicate-ignore-db=information_schema

replicate-ignore-db=performance_schema

#mysqld_multistop1-4

#mysqld_multistart1-4

分别登陆mysql，3306,3307,3308,3309，操作如下：

#mysql-uroot-h127.0.0.1-P3306#分别登陆3306,3307,3308,3309

mysql>stopslave;

changemasterto

master_host='192.168.240.82',master_user='admin',master_password='Pwd.123.!@#',master_log_file='binlog.000002',master_log_pos=300;

mysql>startslave;

查看从库状态

mysql>showslavestatus\G

8.配置mysql_slave2

登录master2数据库赋予slave1数据库权限账号

#mysql-uroot-h127.0.0.1-P3306#f分别登陆3306,3307,3308,3309

grantreplicationslaveon*.*to'admin'@'192.168.240.85'identifiedby'Pwd.123.!@#';

master2上登录数据库查看file和position

登陆slave2，修改my.cnf

#vim/etc/my.cnf

[mysqld1],[mysqld2],[mysqld3],[mysqld4]中加入内容如下

server-id=4

log-bin=binlog

replicate-ignore-db=test

replicate-ignore-db=information_schema

replicate-ignore-db=performance_schema

#mysqld_multistop1-4

#mysqld_multistart1-4

分别登陆mysql，3306,3307,3308,3309，操作如下：

#mysql-uroot-h127.0.0.1-P3306#分别登陆3306,3307,3308,3309

mysql>stopslave;

changemasterto

master_host='192.168.240.83',master_user='admin',master_password='Pwd.123.!@#',master_log_file='binlog.000001',master_log_pos=702;

mysql>startslave;

查看从库状态

mysql>showslavestatus\G

二、安装与配置keepalived（每台都安装）

1.安装兼容包

#yum-yinstallopensslopenssl-develipvsadmpopt-devel

2.下载并安装keepalived

#wgethttp://www.keepalived.org/software/keepalived-1.2.7.tar.gz

#tarzxvfkeepalived-1.2.7.tar.gz

#cdkeepalived-1.2.7

#./configure&&make&&makeinstall

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

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

#mkdir/etc/keepalived

#cp/usr/local/sbin/keepalived/usr/sbin/

#cp/usr/local/etc/keepalived/keepalived.conf/etc/keepalived/

#chkconfig--addkeepalived

3.mysql_master1,mysql_master2keepalived配置

#vi/etc/keepalived/keepalived.conf

!ConfigurationFileforkeepalived

global_defs{

notification_email{

zhengxiaofeiccc@126.com

}

notification_email_fromAlexandre.Cassen@firewall.loc

smtp_serversmtp.126.com

smtp_connect_timeout30

router_idLVS_DEVEL

}

vrrp_instanceVI_1{

stateBACKUP

interfaceeth0

virtual_router_id54

priority100#master2改为90

advert_int1

nopreempt#不抢占ip，只在master1上设置

authentication{

auth_typePASS

auth_pass1111

}

virtual_ipaddress{

192.168.240.91

}

}

4.Mysql_slave1,mysql_slave2keepalived配置

#vi/etc/keepalived/keepalived.conf

!ConfigurationFileforkeepalived

global_defs{

notification_email{

zhengxiaofeiccc@126.com

}

notification_email_fromAlexandre.Cassen@firewall.loc

smtp_serversmtp.126.com

smtp_connect_timeout30

router_idLVS_DEVEL

}

vrrp_instanceVI_1{

stateBACKUP

interfaceeth0

virtual_router_id55

priority100#mysql_slave2改为90

advert_int1

nopreempt#不抢占ip，只在slave1上设置

authentication{

auth_typePASS

auth_pass1111

}

virtual_ipaddress{

192.168.240.92

}

}

5.启动keepalived，并查看

#serviceseepalivedstart

6.编写mysql_master监控脚本

#vimcheck_mysql_master.sh

#!/bin/sh

#############check_port################

netstat -antlp|grep :::3306 && mysql_port[0]=3306

netstat -antlp|grep :::3307 && mysql_port[1]=3307

netstat -antlp|grep :::3308 && mysql_port[2]=3308

netstat -antlp|grep :::3309 && mysql_port[3]=3309

############check_status###############

mysql -u root -h 127.0.0.1 -P 3306 -e "showdatabases" && mysql_status[0]=1

mysql -u root -h 127.0.0.1 -P 3307 -e "showdatabases" && mysql_status[1]=2

mysql -u root -h 127.0.0.1 -P 3308 -e "showdatabases" && mysql_status[2]=3

mysql -u root -h 127.0.0.1 -P 3309 -e "showdatabases" && mysql_status[3]=4

if [ ${#mysql_port[*]} -ne 4 -o ${#mysql_status[*]} -ne 4 ];

then

echo"service keepalived stop"

fi

加入计划任务，每隔一分钟执行一次

7.编写mysql_slave监控脚本

#vimcheck_mysql_slave.sh

#!/bin/sh

#############check_status####################

mysql -u root -h 127.0.0.1 -P 3306 -e "showdatabases" && mysql_status[0]=1

mysql -u root -h 127.0.0.1 -P 3307 -e "showdatabases" && mysql_status[1]=2

mysql -u root -h 127.0.0.1 -P 3308 -e "showdatabases" && mysql_status[2]=3

mysql -u root -h 127.0.0.1 -P 3309 -e "showdatabases" && mysql_status[3]=4

#############check_slave_status##############

mysql -u root -h 127.0.0.1 -P 3306 -e "show slaves tatus\G"|head-13|tail-2|grep No\

&& mysql_slave_status=1||mysql_slave_status=0

if [ ${#mysql_status[*]} -ne 4 -o $mysql_slave_status -eq 1 ];then

service keepalived stop

fi

转载于:https://blog.51cto.com/363070085/1298772