原理：MySQL router根據端口來區分讀寫，把連接讀寫端口的所有請求發往master，連接只讀端口的所有請求以輪詢方式發往多個slave，從而實現讀寫分離

主： SQL-Master 192.168.200.101/24

從： SQL-Slave 192.168.200.102/24,192.168.200.103/24

mysql-router 192.168.200.104/24

使用rpm安裝mysql-router

rpm -ivh https://dev.mysql.com/get/Downloads/MySQL-Router/mysql-router-2.1.4-1.el7.x86_64.rpm

vim /etc/mysqlrouter/mysqlrouter.conf

[DEFAULT]

logging_folder = /var/log/mysqlrouter/

plugin_folder = /usr/lib64/mysqlrouter

runtime_folder = /var/run/mysqlrouter

config_folder = /etc/mysqlrouter

[logger]

level = info

[keepalive]

interval = 60

[routing:read_write]

bind_address=192.168.200.104 #監聽地址

bind_port=7001 #監聽端口

destinations=192.168.200.101:3306 #mysql列表

mode=read-write #指定讀寫

max_connections=1024

max_connect_errors=100

client_connect_timeout=9

[routing:read_only]

bind_address=192.168.200.104

bind_port=7002

destinations=192.168.200.102:3306,192.168.200.103:3306

mode=read-only #指定只讀

max_connections=65535

max_connect_errors=100

client_connect_timeout=9

systemctl start mysqlrouter

systemctl enable mysqlrouter

ss -ntlu

tcp LISTEN 0 128 192.168.200.106:7001 *:*

tcp LISTEN 0 128 192.168.200.106:7002 *:*

主數據庫配置：

mysql -u root -p123456

創建用戶test設置密碼123456

MariaDB [(none)]> grant all on *.* to buck@‘127.0.0.1‘ identified by "hello";

MariaDB [(none)]> use mysql;

修改host權限

MariaDB [(none)]> update user set host = ‘%‘ where user = ‘test‘;

MariaDB [mysql]> select user, host from user;

+------+---------------+

| user | host |

+------+---------------+

| test | % |

刷新數據庫

MariaDB [mysql]> flush privileges;

mysql -utest -p123456 -h192.168.200.104 -P7001

Mysql讀寫分離-Mysql router