MYSQL多實例配置方法 mysqld_multi方法

在實際的開發過程中，可能會需要在一臺服務器上部署多個MYSQL實例，那建議使用MYSQL官方的解決方案 mysqld_multi
1.修改my.cnf
如一個定義兩個實例的參考配置：

1. [mysqld_multi]
   

2. mysqld = /usr/local/mysql/bin/mysqld_safe
   

3. mysqladmin = /usr/local/mysql/bin/mysqladmin
   

4. user = your_user
   

5. password = your_password
   

6. [mysqld1]
   

7. datadir = /data/db/my1
   

8. #連接
   

9. port = 3306
   

10. socket = /tmp/mysql3306.sock
    

11. #binlog
    

12. log-bin=/data/db/mylog1/mysql-bin
    

13. binlog_format=mixed
    

14. binlog_cache_size = 32M
    

15. expire_logs_days = 30
    

16. [mysqld2]
    

17. datadir = /data/db/my2
    

18. #連接
    

19. port = 3307
    

20. socket = /tmp/mysql3307.sock
    

21. #binlog
    

22. log-bin=/data/db/mylog2/mysql-bin
    

23. binlog_format=mixed
    

24. binlog_cache_size = 32M
    

25. expire_logs_days = 3

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2.創建數據目錄

1. mkdir -p /data/db/my21
   

2. mkdir -p /data/db/my2
   

3. chown mysql.mysql /data/db/my1 -R
   

4. chown mysql.mysql /data/db/my2 -R

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3.初始化DB

1. /usr/local/mysql/scripts/mysql_install_db --datadir=/data/db/my1/ -uroot (mysql_install_db也是MYSQL官方自帶工具)
   

2. /usr/local/mysql/scripts/mysql_install_db --datadir=/data/db/my2/ -uroot
   

3. chown mysql.mysql /data/db/my1/ -R
   

4. chown mysql.mysql /data/db/my2/ -R

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4. 安裝工具

1. cp /usr/local/mysql/bin/my_print_defaults /usr/bin/
   

2. cp /usr/local/mysql/bin/mysqld_multi /usr/bin/

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5.創建、授權用戶

1. CREATE USER "your_user"@"192.168.1.%" IDENTIFIED BY 'your_password';
   

2. GRANT ALL PRIVILEGES ON *.* TO "your_user"@"192.168.1.%";
   

3. flush privileges;

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至此，mysql多實例配置已經完畢。我們看到多個不同的MYSQL實例是共用my.cnf的。多實例命令行管理：
1.mysql啓動

1. mysqld_multi start 1 啓動實例1
   

2. mysqld_multi start 1-2 啓動實例1,2

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2.mysql重啓

1. mysqld_multi restart 1 重啓實例1
   

2. mysqld_multi restart 1-2 重啓實例1,2

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3.mysql關閉

1. mysqld_multi stop 1 關閉實例1
   

2. mysqld_multi stop 1-2 關閉實例1,2

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4.命令行登陸實例2

1. mysql -u your_user -p your_password -P3307 -S /tmp/mysql3307.sock

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