基于proxysql实现MySQL读写分离

# 安装
yum localinstall -y ./proxysql-2.2.0-1-centos7.x86_64.rpm
# 启动
systemctl start proxysql

# 1. 登录管理端
mysql -uadmin -padmin -h127.0.0.1 -P6032
# 2. 配置主从库
use main;
insert into mysql_servers(hostgroup_id,hostname,port,weight,comment) values(1,'192.168.0.10',3306,1,'master1');
insert into mysql_servers(hostgroup_id,hostname,port,weight,comment) values(2,'192.168.0.11',3306,1,'slave1');
# 2.2 检查添加结果
select * from main.mysql_servers;
# 2.3 加载配置到RUNTIME
load mysql servers to runtime;
# 2.4 写盘保存
save mysql servers to disk;
# 3. 配置proxysql客户端账户密码。
# 设置所有请求默认到hostgroupid为1的实例然后再根据路由分发
# transaction_persistent为1开启事务支持
insert into mysql_users(username,password,default_hostgroup,transaction_persistent)values('root','123456',1,1);
# 3.2 查询账户添加结果
select * from mysql_users;
# 3.3 保存
load mysql users to runtime;
save mysql users to disk;
# 4. 配置健康检测账号
# 4.1 登录后端master的mysql控制台
GRANT replication client ON *.* TO 'monitor'@'%' IDENTIFIED BY '123456';
flush privileges;
# 4.2 切换回proxy的控制台
set mysql-monitor_username='monitor';
set mysql-monitor_password='123456';
load mysql variables to runtime;
save mysql variables to disk;
# 5. 配置读写分离路由
# 将select语句全部路由至hostgroup_id=2的组，也就是从节点
# select * from tb for update这样的语句是修改数据的，所以需要单独定义，将它路由至hostgroup_id=1的组(也就是主节点)
# 其他没有被规则匹配到的组将会被路由至用户默认的组(mysql_users表中的default_hostgroup)
insert into mysql_query_rules(rule_id,active,match_digest,destination_hostgroup,apply)values(1,1,'^SELECT.*FOR UPDATE$',1,1);
insert into mysql_query_rules(rule_id,active,match_digest,destination_hostgroup,apply)values(2,1,'^SELECT',2,1);
load mysql query rules to runtime;
load admin variables to runtime;
save mysql query rules to disk;
save admin variables to disk;

mysql -uroot -p'123456' -P6033 -h 127.0.0.1
# 随便执行点sql语句

select * from stats.stats_mysql_query_digest;
-- 或者 select hostgroup,schemaname,digest_text,count_star,sum_time,min_time,max_time,sum_rows_affected,sum_rows_sent from stats.stats_mysql_query_digest;

set mysql-threads=16;
-- 查看
show variables like '%mysql-threads%';