MySQL/MariaDB数据库的主主复制

　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰 

版权声明：原创作品，谢绝转载！否则将追究法律责任。

一.主主复制概述

1>.什么是主主复制

  1. 　　所谓的主主复制，说白了就是两台节点互为主从关系。

2>.主主复制考虑要点

  1. 　　由于主主复制，2个MySQL实例均可以进行写操作，需要考虑客户端在Innodb存储引擎中对同一行的操作，以及自动增长id的关系。

3>.主主复制的缺点

  1. 　　由于2个节点都可以进行写操作，很容易产生数据不一致的问题,因此生产环境中咱们得慎用呀！
    　　一般情况下主从复制就够用了,考虑到可用性的话可以对master节点使用keepalived做一个高可用即可~

二.主主复制实战

1>.试验环境说明

  1. [root@node102.yinzhengjie.org.cn ~]# cat /etc/redhat-release
  2. CentOS Linux release 7.6. (Core)
  3. [root@node102.yinzhengjie.org.cn ~]#
  4. [root@node102.yinzhengjie.org.cn ~]# uname -r
  5. 3.10.-.el7.x86_64
  6. [root@node102.yinzhengjie.org.cn ~]#
  7. [root@node102.yinzhengjie.org.cn ~]# uname -m
  8. x86_64
  9. [root@node102.yinzhengjie.org.cn ~]#
  10. [root@node102.yinzhengjie.org.cn ~]# free -h
  11.               total        used        free      shared  buff/cache   available
  12. Mem:           .7G        239M        .0G         24M        446M        .2G
  13. Swap:          .9G          0B        .9G
  14. [root@node102.yinzhengjie.org.cn ~]#
  15. [root@node102.yinzhengjie.org.cn ~]#
  16. [root@node102.yinzhengjie.org.cn ~]#
  17. [root@node102.yinzhengjie.org.cn ~]# mysql --version
  18. mysql  Ver 15.1 Distrib 5.5.-MariaDB, for Linux (x86_64) using readline 5.1
  19. [root@node102.yinzhengjie.org.cn ~]#

node102.yinzhengjie.org.cn节点信息

  1. [root@node103.yinzhengjie.org.cn ~]# cat /etc/redhat-release
  2. CentOS Linux release 7.6. (Core)
  3. [root@node103.yinzhengjie.org.cn ~]#
  4. [root@node103.yinzhengjie.org.cn ~]# uname -r
  5. 3.10.-.el7.x86_64
  6. [root@node103.yinzhengjie.org.cn ~]#
  7. [root@node103.yinzhengjie.org.cn ~]# uname -m
  8. x86_64
  9. [root@node103.yinzhengjie.org.cn ~]#
  10. [root@node103.yinzhengjie.org.cn ~]# free -h
  11.               total        used        free      shared  buff/cache   available
  12. Mem:           .7G        245M        .9G        8.6M        552M        .2G
  13. Swap:          .9G          0B        .9G
  14. [root@node103.yinzhengjie.org.cn ~]#
  15. [root@node103.yinzhengjie.org.cn ~]# mysql --verwsion
  16. mysql: unknown option '--verwsion'
  17. [root@node103.yinzhengjie.org.cn ~]#
  18. [root@node103.yinzhengjie.org.cn ~]# mysql --version
  19. mysql  Ver 15.1 Distrib 5.5.-MariaDB, for Linux (x86_64) using readline 5.1
  20. [root@node103.yinzhengjie.org.cn ~]#
  21. [root@node103.yinzhengjie.org.cn ~]#

node103.yinzhengjie.org.cn节点信息

2>.编辑node102.yinzhengjie.org.cn节点的my.cnf配置文件

  1. [root@node102.yinzhengjie.org.cn ~]# cat /etc/my.cnf
  2. [mysqld]
  3. server-id                =         　　　　　　　　　　　　　　#为当前节点设置一个全局惟一的ID号,用于标识当前MySQL实例
  4. binlog_format            = row     　　　　　　　　　　　　　　　　#推荐使用基于行数据的复制
  5. log_bin                  = /data/mysql/logbin/master-   　　#需要启用二进制日志,生产环境建议和数据文件分开放存放
  6. relay_log                = relay-log-  　　　　　　　　　　　　#relay log的文件路径，默认值hostname-relay-bin
  7. relay_log_index          = relay-log-.index 　　  　　　　　　#默认值hostname-relay-bin.index
  8. auto_increment_offset    =            　　　　　　　  　　　　　　#指定当前实例自动增长的开始数字
  9. auto_increment_increment =        　　　　　　　　　　 　　　　　　#指定当前实例自动增长的幅度
  10. character-set-server     = utf8mb4　　
  11. default_storage_engine   = InnoDB
  12. datadir                  = /var/lib/mysql
  13. socket                   = /var/lib/mysql/mysql.sock
  14.  
  15. [mysqld_safe]
  16. log-error                = /var/log/mariadb/mariadb.log
  17. pid-file                 = /var/run/mariadb/mariadb.pid
  18.  
  19. !includedir /etc/my.cnf.d
  20.  
  21. [root@node102.yinzhengjie.org.cn ~]#
  22. [root@node102.yinzhengjie.org.cn ~]#

3>.启动node102.yinzhengjie.org.cn节点的MySQL实例

  1. [root@node102.yinzhengjie.org.cn ~]# mkdir -pv /data/mysql/logbin/　　　　　　#创建二进制日志存放目录
  2. mkdir: created directory ‘/data’
  3. mkdir: created directory ‘/data/mysql’
  4. mkdir: created directory ‘/data/mysql/logbin/’
  5. [root@node102.yinzhengjie.org.cn ~]#
  6. [root@node102.yinzhengjie.org.cn ~]# ll /data/mysql/logbin/
  7. total
  8. [root@node102.yinzhengjie.org.cn ~]#

[root@node102.yinzhengjie.org.cn ~]# mkdir -pv /data/mysql/logbin/　　   #创建二进制日志存放目录

  1. [root@node102.yinzhengjie.org.cn ~]# ll -d /data/mysql/logbin/
  2. drwxr-xr-x  root root  Nov   : /data/mysql/logbin/
  3. [root@node102.yinzhengjie.org.cn ~]#
  4. [root@node102.yinzhengjie.org.cn ~]# chown -R mysql:mysql /data/mysql/logbin/　　#切记要授权!
  5. [root@node102.yinzhengjie.org.cn ~]#
  6. [root@node102.yinzhengjie.org.cn ~]# ll -d /data/mysql/logbin/
  7. drwxr-xr-x  mysql mysql  Nov   : /data/mysql/logbin/
  8. [root@node102.yinzhengjie.org.cn ~]#
  9. [root@node102.yinzhengjie.org.cn ~]#

[root@node102.yinzhengjie.org.cn ~]# chown -R mysql:mysql /data/mysql/logbin/　　#切记要授权!

  1. [root@node102.yinzhengjie.org.cn ~]# ll /data/mysql/logbin/
  2. total
  3. [root@node102.yinzhengjie.org.cn ~]#
  4. [root@node103.yinzhengjie.org.cn ~]# ll /var/lib/mysql/
  5. total
  6. [root@node103.yinzhengjie.org.cn ~]#
  7. [root@node102.yinzhengjie.org.cn ~]# systemctl start mariadb　　　　　　#启动数据库
  8. [root@node102.yinzhengjie.org.cn ~]#
  9. [root@node102.yinzhengjie.org.cn ~]# ll /data/mysql/logbin/
  10. total
  11. -rw-rw----  mysql mysql   Nov   : master-102.000001
  12. -rw-rw----  mysql mysql  Nov   : master-102.000002
  13. -rw-rw----  mysql mysql     Nov   : master-102.000003
  14. -rw-rw----  mysql mysql     Nov   : master-.index
  15. [root@node102.yinzhengjie.org.cn ~]#
  16. [root@node102.yinzhengjie.org.cn ~]# ll /var/lib/mysql/
  17. total
  18. -rw-rw----  mysql mysql     Nov   : aria_log.
  19. -rw-rw----  mysql mysql        Nov   : aria_log_control
  20. -rw-rw----  mysql mysql  Nov   : ibdata1
  21. -rw-rw----  mysql mysql   Nov   : ib_logfile0
  22. -rw-rw----  mysql mysql   Nov   : ib_logfile1
  23. drwx------  mysql mysql      Nov   : mysql
  24. srwxrwxrwx  mysql mysql         Nov   : mysql.sock
  25. drwx------  mysql mysql      Nov   : performance_schema
  26. drwx------  mysql mysql         Nov   : test
  27. [root@node102.yinzhengjie.org.cn ~]#
  28. [root@node102.yinzhengjie.org.cn ~]#

[root@node102.yinzhengjie.org.cn ~]# systemctl start mariadb　　　　　　#启动数据库

4>.在node102.yinzhengjie.org.cn节点上创建有复制权限的用户账号

  1. [root@node102.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW MASTER LOGS;
  12. +-------------------+-----------+
  13. | Log_name          | File_size |
  14. +-------------------+-----------+
  15. | master-102.000001 |      |
  16. | master-102.000002 |     |
  17. | master-102.000003 |        |
  18. +-------------------+-----------+
  19. rows in set (0.00 sec)
  20.  
  21. MariaDB [(none)]>
  22. MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO 'copy'@'172.30.1.10%' IDENTIFIED BY 'yinzhengjie';
  23. Query OK,  rows affected (0.00 sec)
  24.  
  25. MariaDB [(none)]>
  26. MariaDB [(none)]> SHOW MASTER LOGS;
  27. +-------------------+-----------+
  28. | Log_name          | File_size |
  29. +-------------------+-----------+
  30. | master-102.000001 |      |
  31. | master-102.000002 |     |
  32. | master-102.000003 |        |
  33. +-------------------+-----------+
  34. rows in set (0.00 sec)
  35.  
  36. MariaDB [(none)]>
  37. MariaDB [(none)]> SELECT user,host,password FROM mysql.user;
  38. +------+----------------------------+-------------------------------------------+
  39. | user | host                       | password                                  |
  40. +------+----------------------------+-------------------------------------------+
  41. | root | localhost                  |                                           |
  42. | root | node102.yinzhengjie.org.cn |                                           |
  43. | root | 127.0.0.1                  |                                           |
  44. | root | ::                        |                                           |
  45. |      | localhost                  |                                           |
  46. |      | node102.yinzhengjie.org.cn |                                           |
  47. | copy | 172.30.1.10%               | *BD0B1F48FDC55BD27555FC2F22FF29A68A25A1D7 |
  48. +------+----------------------------+-------------------------------------------+
  49.  rows in set (0.00 sec)
  50.  
  51. MariaDB [(none)]>
  52. MariaDB [(none)]>

MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO 'copy'@'172.30.1.10%' IDENTIFIED BY 'yinzhengjie';

5>.编辑node103.yinzhengjie.org.cn节点的my.cnf配置文件

  1. [root@node103.yinzhengjie.org.cn ~]# cat /etc/my.cnf
  2. [mysqld]
  3. server-id                =
  4. binlog_format            = row
  5. log_bin                  = /data/mysql/logbin/master-
  6. relay_log                = relay-log-
  7. relay_log_index          = relay-log-.index
  8. auto_increment_offset    = 　　　　　　　　#注意这个起始位置不要和node102.yinzhengjie.org.cn配置一样哟
  9. auto_increment_increment =
  10. character-set-server     = utf8mb4
  11. default_storage_engine   = InnoDB
  12. datadir                  = /var/lib/mysql
  13. socket                   = /var/lib/mysql/mysql.sock
  14.  
  15. [mysqld_safe]
  16. log-error                = /var/log/mariadb/mariadb.log
  17. pid-file                 = /var/run/mariadb/mariadb.pid
  18.  
  19. !includedir /etc/my.cnf.d
  20. [root@node103.yinzhengjie.org.cn ~]#

6>.启动node103.yinzhengjie.org.cn节点的MySQL实例

  1. [root@node103.yinzhengjie.org.cn ~]# install -d /data/mysql/logbin -o mysql -g mysql　　　　#创建存放的二进制目录
  2. [root@node103.yinzhengjie.org.cn ~]#
  3. [root@node103.yinzhengjie.org.cn ~]# ll -d /data/mysql/logbin/
  4. drwxr-xr-x  mysql mysql  Nov   : /data/mysql/logbin/
  5. [root@node103.yinzhengjie.org.cn ~]#
  6. [root@node103.yinzhengjie.org.cn ~]# ll /data/mysql/logbin/
  7. total
  8. [root@node103.yinzhengjie.org.cn ~]#

[root@node103.yinzhengjie.org.cn ~]# install -d /data/mysql/logbin -o mysql -g mysql　　　　#创建存放的二进制目录

  1. [root@node103.yinzhengjie.org.cn ~]# ll /var/lib/mysql/
  2. total
  3. [root@node103.yinzhengjie.org.cn ~]#
  4. [root@node103.yinzhengjie.org.cn ~]# ll /data/mysql/logbin/
  5. total
  6. [root@node103.yinzhengjie.org.cn ~]#
  7. [root@node103.yinzhengjie.org.cn ~]# systemctl start mariadb
  8. [root@node103.yinzhengjie.org.cn ~]#
  9. [root@node103.yinzhengjie.org.cn ~]# ll /var/lib/mysql/
  10. total
  11. -rw-rw----  mysql mysql     Nov   : aria_log.
  12. -rw-rw----  mysql mysql        Nov   : aria_log_control
  13. -rw-rw----  mysql mysql  Nov   : ibdata1
  14. -rw-rw----  mysql mysql   Nov   : ib_logfile0
  15. -rw-rw----  mysql mysql   Nov   : ib_logfile1
  16. drwx------  mysql mysql      Nov   : mysql
  17. srwxrwxrwx  mysql mysql         Nov   : mysql.sock
  18. drwx------  mysql mysql      Nov   : performance_schema
  19. drwx------  mysql mysql         Nov   : test
  20. [root@node103.yinzhengjie.org.cn ~]#
  21. [root@node103.yinzhengjie.org.cn ~]# ll /data/mysql/logbin/
  22. total
  23. -rw-rw----  mysql mysql   Nov   : master-103.000001
  24. -rw-rw----  mysql mysql  Nov   : master-103.000002
  25. -rw-rw----  mysql mysql     Nov   : master-103.000003
  26. -rw-rw----  mysql mysql     Nov   : master-.index
  27. [root@node103.yinzhengjie.org.cn ~]#

[root@node103.yinzhengjie.org.cn ~]# systemctl start mariadb

7>.配置两节点互为主主节点并验证

  1. [root@node103.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> CHANGE MASTER TO
  12.     -> MASTER_HOST='172.30.1.102',
  13.     -> MASTER_USER='copy',
  14.     -> MASTER_PASSWORD='yinzhengjie',
  15.     -> MASTER_PORT=,
  16.     -> MASTER_LOG_FILE='master-102.000003',
  17.     -> MASTER_LOG_POS=,
  18.     -> MASTER_CONNECT_RETRY=;
  19. Query OK,  rows affected (0.01 sec)
  20.  
  21. MariaDB [(none)]>
  22. MariaDB [(none)]> SHOW PROCESSLIST;
  23. +----+------+-----------+------+---------+------+-------+------------------+----------+
  24. | Id | User | Host      | db   | Command | Time | State | Info             | Progress |
  25. +----+------+-----------+------+---------+------+-------+------------------+----------+
  26. |  | root | localhost | NULL | Query   |     | NULL  | SHOW PROCESSLIST |    0.000 |
  27. +----+------+-----------+------+---------+------+-------+------------------+----------+
  28. row in set (0.00 sec)
  29.  
  30. MariaDB [(none)]>
  31. MariaDB [(none)]> START SLAVE;
  32. Query OK,  rows affected (0.00 sec)
  33.  
  34. MariaDB [(none)]>
  35. MariaDB [(none)]> SHOW PROCESSLIST\G
  36. *************************** . row ***************************
  37.       Id:
  38.     User: root
  39.     Host: localhost
  40.       db: NULL
  41.  Command: Query
  42.     Time:
  43.    State: NULL
  44.     Info: SHOW PROCESSLIST
  45. Progress: 0.000
  46. *************************** . row ***************************
  47.       Id:
  48.     User: system user
  49.     Host:
  50.       db: NULL
  51.  Command: Connect
  52.     Time:
  53.    State: Waiting for master to send event
  54.     Info: NULL
  55. Progress: 0.000
  56. *************************** . row ***************************
  57.       Id:
  58.     User: system user
  59.     Host:
  60.       db: NULL
  61.  Command: Connect
  62.     Time:
  63.    State: Slave has read all relay log; waiting for the slave I/O thread to update it
  64.     Info: NULL
  65. Progress: 0.000
  66. rows in set (0.00 sec)
  67.  
  68. MariaDB [(none)]>
  69. MariaDB [(none)]> SHOW SLAVE STATUS\G
  70. *************************** . row ***************************
  71.                Slave_IO_State: Waiting for master to send event
  72.                   Master_Host: 172.30.1.102
  73.                   Master_User: copy
  74.                   Master_Port:
  75.                 Connect_Retry:
  76.               Master_Log_File: master-102.000003
  77.           Read_Master_Log_Pos:
  78.                Relay_Log_File: relay-log-103.000002
  79.                 Relay_Log_Pos:
  80.         Relay_Master_Log_File: master-102.000003
  81.              Slave_IO_Running: Yes
  82.             Slave_SQL_Running: Yes
  83.               Replicate_Do_DB:
  84.           Replicate_Ignore_DB:
  85.            Replicate_Do_Table:
  86.        Replicate_Ignore_Table:
  87.       Replicate_Wild_Do_Table:
  88.   Replicate_Wild_Ignore_Table:
  89.                    Last_Errno:
  90.                    Last_Error:
  91.                  Skip_Counter:
  92.           Exec_Master_Log_Pos:
  93.               Relay_Log_Space:
  94.               Until_Condition: None
  95.                Until_Log_File:
  96.                 Until_Log_Pos:
  97.            Master_SSL_Allowed: No
  98.            Master_SSL_CA_File:
  99.            Master_SSL_CA_Path:
  100.               Master_SSL_Cert:
  101.             Master_SSL_Cipher:
  102.                Master_SSL_Key:
  103.         Seconds_Behind_Master:
  104. Master_SSL_Verify_Server_Cert: No
  105.                 Last_IO_Errno:
  106.                 Last_IO_Error:
  107.                Last_SQL_Errno:
  108.                Last_SQL_Error:
  109.   Replicate_Ignore_Server_Ids:
  110.              Master_Server_Id:
  111. row in set (0.00 sec)
  112.  
  113. MariaDB [(none)]>
  114. MariaDB [(none)]> SELECT user,host,password FROM mysql.user;
  115. +------+----------------------------+-------------------------------------------+
  116. | user | host                       | password                                  |
  117. +------+----------------------------+-------------------------------------------+
  118. | root | localhost                  |                                           |
  119. | root | node103.yinzhengjie.org.cn |                                           |
  120. | root | 127.0.0.1                  |                                           |
  121. | root | ::                        |                                           |
  122. |      | localhost                  |                                           |
  123. |      | node103.yinzhengjie.org.cn |                                           |
  124. | copy | 172.30.1.10%               | *BD0B1F48FDC55BD27555FC2F22FF29A68A25A1D7 |
  125. +------+----------------------------+-------------------------------------------+
  126. rows in set (0.00 sec)
  127.  
  128. MariaDB [(none)]> SHOW MASTER LOGS;
  129. +-------------------+-----------+
  130. | Log_name          | File_size |
  131. +-------------------+-----------+
  132. | master-103.000001 |      |
  133. | master-103.000002 |     |
  134. | master-103.000003 |        |
  135. +-------------------+-----------+
  136. rows in set (0.00 sec)
  137.  
  138. MariaDB [(none)]>
  139. MariaDB [(none)]> QUIT
  140. Bye
  141. [root@node103.yinzhengjie.org.cn ~]#

配置node103.yinzhengjie.org.cn为node102.yinzhengjie.org.cn从节点详细过程

  1. [root@node102.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW PROCESSLIST\G
  12. *************************** . row ***************************
  13.       Id:
  14.     User: root
  15.     Host: localhost
  16.       db: NULL
  17.  Command: Query
  18.     Time:
  19.    State: NULL
  20.     Info: SHOW PROCESSLIST
  21. Progress: 0.000
  22. *************************** . row ***************************
  23.       Id:
  24.     User: copy
  25.     Host: node103.yinzhengjie.org.cn:
  26.       db: NULL
  27.  Command: Binlog Dump
  28.     Time:
  29.    State: Master has sent all binlog to slave; waiting for binlog to be updated
  30.     Info: NULL
  31. Progress: 0.000
  32.  rows in set (0.00 sec)
  33.  
  34. MariaDB [(none)]>
  35. MariaDB [(none)]> SHOW MASTER LOGS;
  36. +-------------------+-----------+
  37. | Log_name          | File_size |
  38. +-------------------+-----------+
  39. | master-102.000001 |      |
  40. | master-102.000002 |     |
  41. | master-102.000003 |        |
  42. +-------------------+-----------+
  43.  rows in set (0.00 sec)
  44.  
  45. MariaDB [(none)]>
  46. MariaDB [(none)]> QUIT
  47. Bye
  48. [root@node102.yinzhengjie.org.cn ~]#

查看node102.yinzhengjie.org.cn节点的线程数

  1. [root@node103.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW PROCESSLIST\G
  12. *************************** . row ***************************
  13.       Id:
  14.     User: root
  15.     Host: localhost
  16.       db: NULL
  17.  Command: Query
  18.     Time:
  19.    State: NULL
  20.     Info: SHOW PROCESSLIST
  21. Progress: 0.000
  22. *************************** . row ***************************
  23.       Id:
  24.     User: system user
  25.     Host:
  26.       db: NULL
  27.  Command: Connect
  28.     Time:
  29.    State: Waiting for master to send event
  30.     Info: NULL
  31. Progress: 0.000
  32. *************************** . row ***************************
  33.       Id:
  34.     User: system user
  35.     Host:
  36.       db: NULL
  37.  Command: Connect
  38.     Time:
  39.    State: Slave has read all relay log; waiting for the slave I/O thread to update it
  40.     Info: NULL
  41. Progress: 0.000
  42.  rows in set (0.00 sec)
  43.  
  44. MariaDB [(none)]>
  45. MariaDB [(none)]> QUIT
  46. Bye
  47. [root@node103.yinzhengjie.org.cn ~]#

查看node103.yinzhengjie.org.cn节点的线程数

  1. [root@node102.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW DATABASES;
  12. +--------------------+
  13. | Database           |
  14. +--------------------+
  15. | information_schema |
  16. | mysql              |
  17. | performance_schema |
  18. | test               |
  19. +--------------------+
  20.  rows in set (0.00 sec)
  21.  
  22. MariaDB [(none)]>
  23. MariaDB [(none)]> CREATE DATABASE devops;
  24. Query OK,  row affected (0.00 sec)
  25.  
  26. MariaDB [(none)]>
  27. MariaDB [(none)]> USE devops
  28. Database changed
  29. MariaDB [devops]>
  30. MariaDB [devops]> CREATE TABLE students(id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,name VARCHAR() NOT NULL,sex ENUM('boy','girl') DEFAULT 'boy',age TINYINT UNSIGNED,mobile CHAR(),address VARCHAR());
  31. Query OK,  rows affected (0.00 sec)
  32.  
  33. MariaDB [devops]>
  34. MariaDB [devops]> DESC students;
  35. +---------+---------------------+------+-----+---------+----------------+
  36. | Field   | Type                | Null | Key | Default | Extra          |
  37. +---------+---------------------+------+-----+---------+----------------+
  38. | id      | int() unsigned    | NO   | PRI | NULL    | auto_increment |
  39. | name    | varchar()         | NO   |     | NULL    |                |
  40. | sex     | enum('boy','girl')  | YES  |     | boy     |                |
  41. | age     | tinyint() unsigned | YES  |     | NULL    |                |
  42. | mobile  | char()            | YES  |     | NULL    |                |
  43. | address | varchar()         | YES  |     | NULL    |                |
  44. +---------+---------------------+------+-----+---------+----------------+
  45.  rows in set (0.00 sec)
  46.  
  47. MariaDB [devops]> INSERT INTO students SET name='尹正杰',age=,address='北京';
  48. Query OK,  row affected (0.00 sec)
  49.  
  50. MariaDB [devops]>
  51. MariaDB [devops]> SELECT * FROM students;
  52. +----+-----------+------+------+--------+---------+
  53. | id | name      | sex  | age  | mobile | address |
  54. +----+-----------+------+------+--------+---------+
  55. |   | 尹正杰    | boy  |    | NULL   | 北京    |
  56. +----+-----------+------+------+--------+---------+
  57.  row in set (0.00 sec)
  58.  
  59. MariaDB [devops]>
  60. MariaDB [devops]> SHOW MASTER LOGS;
  61. +-------------------+-----------+
  62. | Log_name          | File_size |
  63. +-------------------+-----------+
  64. | master-102.000001 |      |
  65. | master-102.000002 |     |
  66. | master-102.000003 |        |
  67. +-------------------+-----------+
  68.  rows in set (0.00 sec)
  69.  
  70. MariaDB [devops]>
  71. MariaDB [devops]> SHOW MASTER STATUS;
  72. +-------------------+----------+--------------+------------------+
  73. | File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
  74. +-------------------+----------+--------------+------------------+
  75. | master-102.000003 |       |              |                  |
  76. +-------------------+----------+--------------+------------------+
  77.  row in set (0.00 sec)
  78.  
  79. MariaDB [devops]>
  80. MariaDB [devops]> QUIT
  81. Bye
  82. [root@node102.yinzhengjie.org.cn ~]#
  83. [root@node102.yinzhengjie.org.cn ~]#

在node102.yinzhengjie.org.cn中创建测试数据

  1. [root@node103.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW DATABASES;
  12. +--------------------+
  13. | Database           |
  14. +--------------------+
  15. | information_schema |
  16. | devops             |
  17. | mysql              |
  18. | performance_schema |
  19. | test               |
  20. +--------------------+
  21.  rows in set (0.00 sec)
  22.  
  23. MariaDB [(none)]>
  24. MariaDB [(none)]> USE devops
  25. Reading table information for completion of table and column names
  26. You can turn off this feature to get a quicker startup with -A
  27.  
  28. Database changed
  29. MariaDB [devops]>
  30. MariaDB [devops]> SHOW TABLES;
  31. +------------------+
  32. | Tables_in_devops |
  33. +------------------+
  34. | students         |
  35. +------------------+
  36.  row in set (0.00 sec)
  37.  
  38. MariaDB [devops]>
  39. MariaDB [devops]> SELECT * FROM students;
  40. +----+-----------+------+------+--------+---------+
  41. | id | name      | sex  | age  | mobile | address |
  42. +----+-----------+------+------+--------+---------+
  43. |   | 尹正杰    | boy  |    | NULL   | 北京    |
  44. +----+-----------+------+------+--------+---------+
  45.  row in set (0.00 sec)
  46.  
  47. MariaDB [devops]>
  48. MariaDB [devops]> QUIT
  49. Bye
  50. [root@node103.yinzhengjie.org.cn ~]#

在node103.yinzhengjie.org.cn节点上可以看到和node102.yinzhengjie.org.cn节点一样的数据(配置成功)

  1. [root@node102.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW PROCESSLIST\G
  12. *************************** . row ***************************
  13.       Id:
  14.     User: copy
  15.     Host: node103.yinzhengjie.org.cn:
  16.       db: NULL
  17.  Command: Binlog Dump
  18.     Time:
  19.    State: Master has sent all binlog to slave; waiting for binlog to be updated
  20.     Info: NULL
  21. Progress: 0.000
  22. *************************** . row ***************************
  23.       Id:
  24.     User: root
  25.     Host: localhost
  26.       db: NULL
  27.  Command: Query
  28.     Time:
  29.    State: NULL
  30.     Info: SHOW PROCESSLIST
  31. Progress: 0.000
  32.  rows in set (0.00 sec)
  33.  
  34. MariaDB [(none)]>
  35. MariaDB [(none)]> CHANGE MASTER TO
  36.     -> MASTER_HOST='172.30.1.103',
  37.     -> MASTER_USER='copy',
  38.     -> MASTER_PASSWORD='yinzhengjie',
  39.     -> MASTER_PORT=,
  40.     -> MASTER_LOG_FILE='master-103.000003',
  41.     -> MASTER_LOG_POS=,
  42.     -> MASTER_CONNECT_RETRY=;
  43. Query OK,  rows affected (0.01 sec)
  44.  
  45. MariaDB [(none)]>
  46. MariaDB [(none)]> START SLAVE;
  47. Query OK,  rows affected (0.00 sec)
  48.  
  49. MariaDB [(none)]>
  50. MariaDB [(none)]> SHOW PROCESSLIST\G
  51. *************************** . row ***************************
  52.       Id:
  53.     User: copy
  54.     Host: node103.yinzhengjie.org.cn:
  55.       db: NULL
  56.  Command: Binlog Dump
  57.     Time:
  58.    State: Master has sent all binlog to slave; waiting for binlog to be updated
  59.     Info: NULL
  60. Progress: 0.000
  61. *************************** . row ***************************
  62.       Id:
  63.     User: root
  64.     Host: localhost
  65.       db: NULL
  66.  Command: Query
  67.     Time:
  68.    State: NULL
  69.     Info: SHOW PROCESSLIST
  70. Progress: 0.000
  71. *************************** . row ***************************
  72.       Id:
  73.     User: system user
  74.     Host:
  75.       db: NULL
  76.  Command: Connect
  77.     Time:
  78.    State: Waiting for master to send event
  79.     Info: NULL
  80. Progress: 0.000
  81. *************************** . row ***************************
  82.       Id:
  83.     User: system user
  84.     Host:
  85.       db: NULL
  86.  Command: Connect
  87.     Time:
  88.    State: Slave has read all relay log; waiting for the slave I/O thread to update it
  89.     Info: NULL
  90. Progress: 0.000
  91.  rows in set (0.00 sec)
  92.  
  93. MariaDB [(none)]>
  94. MariaDB [(none)]> SHOW SLAVE STATUS\G
  95. *************************** . row ***************************
  96.                Slave_IO_State: Waiting for master to send event
  97.                   Master_Host: 172.30.1.103
  98.                   Master_User: copy
  99.                   Master_Port:
  100.                 Connect_Retry:
  101.               Master_Log_File: master-103.000003
  102.           Read_Master_Log_Pos:
  103.                Relay_Log_File: relay-log-102.000002
  104.                 Relay_Log_Pos:
  105.         Relay_Master_Log_File: master-103.000003
  106.              Slave_IO_Running: Yes
  107.             Slave_SQL_Running: Yes
  108.               Replicate_Do_DB:
  109.           Replicate_Ignore_DB:
  110.            Replicate_Do_Table:
  111.        Replicate_Ignore_Table:
  112.       Replicate_Wild_Do_Table:
  113.   Replicate_Wild_Ignore_Table:
  114.                    Last_Errno:
  115.                    Last_Error:
  116.                  Skip_Counter:
  117.           Exec_Master_Log_Pos:
  118.               Relay_Log_Space:
  119.               Until_Condition: None
  120.                Until_Log_File:
  121.                 Until_Log_Pos:
  122.            Master_SSL_Allowed: No
  123.            Master_SSL_CA_File:
  124.            Master_SSL_CA_Path:
  125.               Master_SSL_Cert:
  126.             Master_SSL_Cipher:
  127.                Master_SSL_Key:
  128.         Seconds_Behind_Master:
  129. Master_SSL_Verify_Server_Cert: No
  130.                 Last_IO_Errno:
  131.                 Last_IO_Error:
  132.                Last_SQL_Errno:
  133.                Last_SQL_Error:
  134.   Replicate_Ignore_Server_Ids:
  135.              Master_Server_Id:
  136.  row in set (0.00 sec)
  137.  
  138. MariaDB [(none)]>
  139. MariaDB [(none)]> QUIT
  140. Bye
  141. [root@node102.yinzhengjie.org.cn ~]#

配置node102.yinzhengjie.org.cn为node103.yinzhengjie.org.cn从节点详细过程

  1. [root@node102.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW PROCESSLIST\G
  12. *************************** . row ***************************
  13.       Id:
  14.     User: copy
  15.     Host: node103.yinzhengjie.org.cn:
  16.       db: NULL
  17.  Command: Binlog Dump
  18.     Time:
  19.    State: Master has sent all binlog to slave; waiting for binlog to be updated
  20.     Info: NULL
  21. Progress: 0.000
  22. *************************** . row ***************************
  23.       Id:
  24.     User: system user
  25.     Host:
  26.       db: NULL
  27.  Command: Connect
  28.     Time:
  29.    State: Waiting for master to send event
  30.     Info: NULL
  31. Progress: 0.000
  32. *************************** . row ***************************
  33.       Id:
  34.     User: system user
  35.     Host:
  36.       db: NULL
  37.  Command: Connect
  38.     Time:
  39.    State: Slave has read all relay log; waiting for the slave I/O thread to update it
  40.     Info: NULL
  41. Progress: 0.000
  42. *************************** . row ***************************
  43.       Id:
  44.     User: root
  45.     Host: localhost
  46.       db: NULL
  47.  Command: Query
  48.     Time:
  49.    State: NULL
  50.     Info: SHOW PROCESSLIST
  51. Progress: 0.000
  52.  rows in set (0.00 sec)
  53.  
  54. MariaDB [(none)]>
  55. MariaDB [(none)]> SHOW MASTER LOGS;
  56. +-------------------+-----------+
  57. | Log_name          | File_size |
  58. +-------------------+-----------+
  59. | master-102.000001 |      |
  60. | master-102.000002 |     |
  61. | master-102.000003 |        |
  62. +-------------------+-----------+
  63.  rows in set (0.00 sec)
  64.  
  65. MariaDB [(none)]>
  66. MariaDB [(none)]> QUIT
  67. Bye
  68. [root@node102.yinzhengjie.org.cn ~]#

查看node102.yinzhengjie.org.cn节点的线程数

  1. [root@node103.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> SHOW PROCESSLIST\G
  12. *************************** . row ***************************
  13.       Id:
  14.     User: system user
  15.     Host:
  16.       db: NULL
  17.  Command: Connect
  18.     Time:
  19.    State: Waiting for master to send event
  20.     Info: NULL
  21. Progress: 0.000
  22. *************************** . row ***************************
  23.       Id:
  24.     User: system user
  25.     Host:
  26.       db: NULL
  27.  Command: Connect
  28.     Time:
  29.    State: Slave has read all relay log; waiting for the slave I/O thread to update it
  30.     Info: NULL
  31. Progress: 0.000
  32. *************************** . row ***************************
  33.       Id:
  34.     User: copy
  35.     Host: node102.yinzhengjie.org.cn:
  36.       db: NULL
  37.  Command: Binlog Dump
  38.     Time:
  39.    State: Master has sent all binlog to slave; waiting for binlog to be updated
  40.     Info: NULL
  41. Progress: 0.000
  42. *************************** . row ***************************
  43.       Id:
  44.     User: root
  45.     Host: localhost
  46.       db: NULL
  47.  Command: Query
  48.     Time:
  49.    State: NULL
  50.     Info: SHOW PROCESSLIST
  51. Progress: 0.000
  52.  rows in set (0.00 sec)
  53.  
  54. MariaDB [(none)]>
  55. MariaDB [(none)]> SHOW MASTER LOGS;
  56. +-------------------+-----------+
  57. | Log_name          | File_size |
  58. +-------------------+-----------+
  59. | master-103.000001 |      |
  60. | master-103.000002 |     |
  61. | master-103.000003 |        |
  62. +-------------------+-----------+
  63.  rows in set (0.00 sec)
  64.  
  65. MariaDB [(none)]> QUIT
  66. Bye
  67. [root@node103.yinzhengjie.org.cn ~]#
  68. [root@node103.yinzhengjie.org.cn ~]#

查看node103.yinzhengjie.org.cn节点的线程数

  1. [root@node103.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> USE devops;
  12. Reading table information for completion of table and column names
  13. You can turn off this feature to get a quicker startup with -A
  14.  
  15. Database changed
  16. MariaDB [devops]>
  17. MariaDB [devops]> SHOW TABLES;
  18. +------------------+
  19. | Tables_in_devops |
  20. +------------------+
  21. | students         |
  22. +------------------+
  23.  row in set (0.00 sec)
  24.  
  25. MariaDB [devops]>
  26. MariaDB [devops]> SELECT * FROM students;
  27. +----+-----------+------+------+--------+---------+
  28. | id | name      | sex  | age  | mobile | address |
  29. +----+-----------+------+------+--------+---------+
  30. |   | 尹正杰    | boy  |    | NULL   | 北京    |
  31. +----+-----------+------+------+--------+---------+
  32.  row in set (0.00 sec)
  33.  
  34. MariaDB [devops]>
  35. MariaDB [devops]> INSERT INTO students SET name='yinzhengjie',age=,address='shanxi';
  36. Query OK,  row affected (0.01 sec)
  37.  
  38. MariaDB [devops]>
  39. MariaDB [devops]> SELECT * FROM students;
  40. +----+-------------+------+------+--------+---------+
  41. | id | name        | sex  | age  | mobile | address |
  42. +----+-------------+------+------+--------+---------+
  43. |   | 尹正杰      | boy  |    | NULL   | 北京    |
  44. |   | yinzhengjie | boy  |    | NULL   | shanxi  |
  45. +----+-------------+------+------+--------+---------+
  46.  rows in set (0.00 sec)
  47.  
  48. MariaDB [devops]> QUIT
  49. Bye
  50. [root@node103.yinzhengjie.org.cn ~]#

在node103.yinzhengjie.org.cn中创建测试数据

  1. [root@node102.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> USE devops
  12. Reading table information for completion of table and column names
  13. You can turn off this feature to get a quicker startup with -A
  14.  
  15. Database changed
  16. MariaDB [devops]>
  17. MariaDB [devops]> SHOW TABLES;
  18. +------------------+
  19. | Tables_in_devops |
  20. +------------------+
  21. | students         |
  22. +------------------+
  23.  row in set (0.00 sec)
  24.  
  25. MariaDB [devops]>
  26. MariaDB [devops]> SELECT * FROM students;
  27. +----+-------------+------+------+--------+---------+
  28. | id | name        | sex  | age  | mobile | address |
  29. +----+-------------+------+------+--------+---------+
  30. |   | 尹正杰      | boy  |    | NULL   | 北京    |
  31. |   | yinzhengjie | boy  |    | NULL   | shanxi  |
  32. +----+-------------+------+------+--------+---------+
  33.  rows in set (0.00 sec)
  34.  
  35. MariaDB [devops]>
  36. MariaDB [devops]> QUIT
  37. Bye
  38. [root@node102.yinzhengjie.org.cn ~]#

在node102.yinzhengjie.org.cn节点上可以看到和node103.yinzhengjie.org.cn节点一样的数据(配置成功)

 

三.主主复制在生产环境中容易出现的问题刨析

1>.在node102.yinzhengjie.org.cn节点的操作

  1. [root@node102.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]>
  12. MariaDB [(none)]>
  13. MariaDB [(none)]> USE devops
  14. Reading table information for completion of table and column names
  15. You can turn off this feature to get a quicker startup with -A
  16.  
  17. Database changed
  18. MariaDB [devops]>
  19. MariaDB [devops]> SELECT * FROM students;
  20. +----+-------------+------+------+--------+---------+
  21. | id | name        | sex  | age  | mobile | address |
  22. +----+-------------+------+------+--------+---------+
  23. |   | 尹正杰      | boy  |    | NULL   | 北京    |
  24. |   | yinzhengjie | boy  |    | NULL   | shanxi  |
  25. +----+-------------+------+------+--------+---------+
  26.  rows in set (0.00 sec)
  27.  
  28. MariaDB [devops]>
  29. MariaDB [devops]> INSERT INTO students (name,age,mobile,address) VALUES ('Jason Yin',,,'beijing'),('Jay','',,'Taiwan');            #我们同时往表里插入2条记录
    Query OK,  rows affected (0.00 sec)
  30. Records:   Duplicates:   Warnings: 
  31.  
  32. MariaDB [devops]>
  33. MariaDB [devops]> SELECT * FROM students;　　　　　　　　　　#不难发现，node102.yinzhengjie.org.cn自动增长是基于奇数的
  34. +----+-------------+------+------+--------+---------+
  35. | id | name        | sex  | age  | mobile | address |
  36. +----+-------------+------+------+--------+---------+
  37. |   | 尹正杰      | boy  |    | NULL   | 北京    |
  38. |   | yinzhengjie | boy  |    | NULL   | shanxi  |
  39. |   | Jason Yin   | boy  |    |   | beijing |
  40. |   | Jay         | boy  |    |   | Taiwan  |
  41. +----+-------------+------+------+--------+---------+
  42.  rows in set (0.00 sec)
  43.  
  44. MariaDB [devops]>
  45. MariaDB [devops]> QUIT
  46. Bye
  47. [root@node102.yinzhengjie.org.cn ~]#

2>.在node103.yinzhengjie.org.cn节点的操作

  1. [root@node103.yinzhengjie.org.cn ~]# mysql
  2. Welcome to the MariaDB monitor.  Commands end with ; or \g.
  3. Your MariaDB connection id is
  4. Server version: 5.5.-MariaDB MariaDB Server
  5.  
  6. Copyright (c) , , Oracle, MariaDB Corporation Ab and others.
  7.  
  8. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
  9.  
  10. MariaDB [(none)]>
  11. MariaDB [(none)]> USE devops
  12. Reading table information for completion of table and column names
  13. You can turn off this feature to get a quicker startup with -A
  14.  
  15. Database changed
  16. MariaDB [devops]>
  17. MariaDB [devops]> SELECT * FROM students;　　　　　　#我们可以发现数据已经同步过来啦！
  18. +----+-------------+------+------+--------+---------+
  19. | id | name        | sex  | age  | mobile | address |
  20. +----+-------------+------+------+--------+---------+
  21. |   | 尹正杰      | boy  |    | NULL   | 北京    |
  22. |   | yinzhengjie | boy  |    | NULL   | shanxi  |
  23. |   | Jason Yin   | boy  |    |   | beijing |
  24. |   | Jay         | boy  |    |   | Taiwan  |
  25. +----+-------------+------+------+--------+---------+
  26.  rows in set (0.00 sec)
  27.  
  28. MariaDB [devops]>
  29. MariaDB [devops]> INSERT students (age,sex,name,mobile,address) VALUES (,'girl','Gloria Tang Tsz-Kei',null,'Hong Kong');　　　　　　#我们再次插入一条记录
    Query OK,  row affected (0.00 sec)
  30.  
  31. MariaDB [devops]>
  32. MariaDB [devops]> SELECT * FROM students;　　　　　　　　#我们发现新添加的记录自动增长ID竟然跳过了4,而是直接使用6，起始原因在于在添加记录之前就已经存在最大id数字5啦，虽说自动增长的id依旧是偶数,但这个问题我们得考虑一下哟~
  33. +----+---------------------+------+------+--------+-----------+
  34. | id | name                | sex  | age  | mobile | address   |
  35. +----+---------------------+------+------+--------+-----------+
  36. |   | 尹正杰              | boy  |    | NULL   | 北京      |
  37. |   | yinzhengjie         | boy  |    | NULL   | shanxi    |
  38. |   | Jason Yin           | boy  |    |   | beijing   |
  39. |   | Jay                 | boy  |    |   | Taiwan    |
  40. |   | Gloria Tang Tsz-Kei | girl |    | NULL   | Hong Kong |
  41. +----+---------------------+------+------+--------+-----------+
  42.  rows in set (0.00 sec)
  43.  
  44. MariaDB [devops]>
  45. MariaDB [devops]> QUIT
  46. Bye
  47. [root@node103.yinzhengjie.org.cn ~]#
  48. [root@node103.yinzhengjie.org.cn ~]#

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