【数据库】mysql架构之MMM，高可用同时实现读写分离

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前言

本博客内容仅为记录博主思路，仅供参考，一切以自己实践结果为准。

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一、mmm架构

1.0 思路

• 主从复制：先安装数据库–>主服务器授权，刷新授权–>从节点同步配置（需先获得主的文件名及偏移量）
• 注：两个主需要互相做主从，为了故障转换之后数据能继续同步

1.1 架构

作用	IP地址	安装服务
主负载均衡器	192.168.13.10	mmm/mysql5.7
备负载均衡器	192.168.13.20	mmm/mysql5.7
节点服务器1	192.168.13.30	mmm/mysql5.7
节点服务器2	192.168.13.40	mmm/mysql5.7
monitor监控节点	192.168.13.50	mmm

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1.2 主负载均衡

systemctl stop firewalld
setenforce 0
vim /etc/my.cnf
	server-id = 1
	log-error=/usr/local/mysql/data/mysql_error.log
	general_log=ON
	general_log_file=/usr/local/mysql/data/mysql_general.log
	slow_query_log=ON
	slow_query_log_file=mysql_slow_query.log
	long_query_time=5
	binlog-ignore-db=mysql,information_schema
	log_bin=mysql_bin
	log_slave_updates=true
	sync_binlog=1
	innodb_flush_log_at_trx_commit=1
	auto_increment_increment=2
	auto_increment_offset=1

scp /etc/my.cnf root@192.168.13.20:/etc/
scp /etc/my.cnf root@192.168.13.30:/etc/
scp /etc/my.cnf root@192.168.13.40:/etc/

systemctl restart mysqld

mysql -uroot -pabc123
	grant replication slave on *.* to 'replication'@'192.168.13.%' identified by '123456';
	
	show master status;
	#此处获得二进制日志文件名及偏移量，其他服务器配置主从复制时候需要
		
	grant super, replication client, process on *.* to 'mmm_agent'@'192.168.13.%' identified by '123456';
	grant replication client on *.* to 'mmm_monitor'@'192.168.13.%' identified by '123456';
	flush privileges;
	#为monitor服务器授权
	
	change master to master_host='192.168.13.20',master_user='replication',master_password='123456',master_log_file='mysql_bin.000001',master_log_pos=460;
	#此时的二进制文件名与偏移量是从master2获得的，原因：当故障转移后，能够和新主保持主从复制（可以先不执行这一步，等操作完master2再回来授权）
	show slave status\G
	#查看主从同步是够配置成功
	

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum -y install epel-release
yum -y install mysql-mmm*
cd /etc/mysql-mmm/
vim mmm_common.conf
	4行：cluster_interface       ens33
	8行：replication_password    123456
	10行：agent_password          123456
	14行：ip      192.168.13.10
	20行：ip      192.168.13.20
	26行：ip      192.168.13.30
	24-28行复制：24,,28 co 28
	31行：ip      192.168.13.40
	35行：hosts   db1, db2
	37行：ips     192.168.13.188
	41行：hosts   db3, db4
	43行：ips     192.168.13.198, 192.168.13.199

scp mmm_common.conf root@192.168.13.20:/etc/mysql-mmm/
scp mmm_common.conf root@192.168.13.30:/etc/mysql-mmm/
scp mmm_common.conf root@192.168.13.40:/etc/mysql-mmm/
scp mmm_common.conf root@192.168.13.50:/etc/mysql-mmm/

systemctl start mysql-mmm-agent.service
systemctl enable mysql-mmm-agent.service

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1.3 备负载均衡器

systemctl stop firewalld
setenforce 0
vim /etc/my.cnf
	server-id = 2
systemctl restart mysqld.service

mysql -u root -pabc123
	grant replication slave on *.* to 'replication'@'192.168.13.%' identified by '123456';
	
	show master status;
	#此处获得二进制日志文件名及偏移量，为了给master1使用
	
	change master to master_host='192.168.13.20',master_user='replication',master_password='123456',master_log_file='mysql_bin.000001',master_log_pos=460;
	#此时的二进制文件名与偏移量是从master1获得的，原因：为了保持数据一致性，随时可以进行故障转移
	
	grant super, replication client, process on *.* to 'mmm_agent'@'192.168.13.%' identified by '123456';
	grant replication client on *.* to 'mmm_monitor'@'192.168.13.%' identified by '123456';
	flush privileges;
	#为monitor服务器授权
	
	show slave status\G
	#查看主从同步是够配置成功
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum -y install epel-release
yum -y install mysql-mmm*
vim /etc/mysql-mmm/mmm_agent.conf
	6行：this db2

systemctl start mysql-mmm-agent.service
systemctl enable mysql-mmm-agent.service

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1.4 从服务器

systemctl stop firewalld
setenforce 0
vim /etc/my.cnf
	server-id = 3
systemctl restart mysqld.service

mysql -u root -pabc123
	change master to master_host='192.168.13.10',master_user='replication',master_password='123456',master_log_file='mysql_bin.000001',master_log_pos=460;
	#与master1保持主从复制
	
	grant super, replication client, process on *.* to 'mmm_agent'@'192.168.13.%' identified by '123456';
	grant replication client on *.* to 'mmm_monitor'@'192.168.13.%' identified by '123456';
	flush privileges;
	#为monitor服务器授权
	
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum -y install epel-release
yum -y install mysql-mmm*
vim /etc/mysql-mmm/mmm_agent.conf
	6行：this db3
	
systemctl start mysql-mmm-agent.service
systemctl enable mysql-mmm-agent.service

#另外一台从服务器重复此操作，server-id = 4，6行：this db4。修改这两项即可

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1.5 monitor服务器

systemctl stop firewalld
setenforce 0

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum -y install epel-release
yum -y install mysql-mmm*
vim /etc/mysql-mmm/mmm_mon.conf
	8行：ping_ips        192.168.13.10,192.168.13.20,192.168.13.30,192.168.13.40
	9行：auto_set_online     10
	20行：monitor_user        mmm_monitor
	21行：onitor_password    123456
	
systemctl restart mysql-mmm-monitor.service
mmm_control show
#检查各节点的情况，正确显示如下
	db1(192.168.13.10) master/ONLINE. Roles: writer(192.168.13.188)
	db2(192.168.13.20) master/ONLINE. Roles: 
	db3(192.168.13.30) slave/ONLINE. Roles: reader(192.168.13.198)
	db4(192.168.13.40) slave/ONLINE. Roles: reader(192.168.13.199)
#mmm高可用搭建完毕

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二、结语

• 简单的很