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Mysql主从草案的实现

热度：190   发布时间：2016-05-05 16:41:35.0
Mysql主从方案的实现

Mysql主从方案介绍

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mysql主从方案主要作用：

读写分离，使数据库能支撑更大的并发。在报表中尤其重要。由于部分报表sql语句非常的慢，导致锁表，影响前台服务。如果前台使用master，报表使用slave，那么报表sql将不会造成前台锁，保证了前台速度。

发扬不同表引擎的优点。目前Myisam表的查询速度比innodb略快，而写入并发innodb比myIsam要好。那么，我们可以使用innodb作为master，处理高并发写入，使用master作为slave，接受查询。或在myisam?slave中建立全文索引，解决innodb无全文索引的弱点。

热备，slave和master的数据“准实时”同步。

准备工作。先分别安装两台MYSQL。

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系统环境：

OS：RHEL5.4

主：192.168.10.197

从：192.168.10.198

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1、mysql?的安装这里就不介绍了，详见安装文档。

2、my.cnf配置

a、配置MASTER

点击(此处)折叠或打开

  1. [client]
  3. port = 3306
  5. socket = /tmp/mysql.sock
  7. [mysqld]
  9. port = 3306
  11. socket = /tmp/mysql.sock
  13. basedir=/usr/local/mysql
  15. datadir=/home/mysqldata
  17. log-slow-queries=slow_query.txt
  19. log-bin=mysql-bin197
  21. long_query_time=2
  23. skip-locking
  25. skip-name-resolve
  27. skip-innodb
  29. bind-address=192.168.10.197
  31. max_allowed_packet = 256M
  33. query_cache_size=256M
  35. max_connections=2000
  37. max_connect_errors=10000
  39. key_buffer_size=6000M
  41. read_buffer_size=32M
  43. read_rnd_buffer_size = 32M
  45. myisam_sort_buffer_size=256M
  47. tmp_table_size=512M
  49. old-passwords
  51. interactive_timeout=60
  53. wait_timeout=60
  55. connect_timeout=120
  57. table_cache=8192
  59. thread_cache_size=256
  61. sort_buffer_size=64M
  63. back_log = 500
  65. thread_concurrency=32
  67. server-id=1
  68. ?
  69. log-bin=mysql-bin240
  70. ?
  71. binlog-do-db=phpcmsv9
  72. ?
  73. binlog-ignore-db=mysql
  74. ?
  75. expire_logs_days=10
  77. [mysqldump]
  79. quick
  81. max_allowed_packet = 1024M
  83. [mysql]
  85. no-auto-rehash
  87. [isamchk]
  89. key_buffer = 1024M
  91. sort_buffer_size = 32M
  93. read_buffer = 2M
  95. write_buffer = 2M
  97. [myisamchk]
  99. key_buffer = 1024M
  101. sort_buffer_size = 32M
  103. read_buffer = 2M
  105. write_buffer = 2M
  107. [mysqlhotcopy]
  109. interactive-timeout

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注释：红色是修改的部分。

其中，作为主机，server-id必须为1.

binlog_do_db为需要复制的db。?binlog_ignore_db为忽略复制的db。需要增加DB的话，就增加相应的一行。

重启master数据库，运行检查：

点击(此处)折叠或打开

  1. mysql> show master status; #检查是否以master形式启动了。
  3. +---------------------+----------+--------------+------------------+
  5. | File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
  7. +---------------------+----------+--------------+------------------+
  9. | mysql-bin240.000001 | 2342775 | phpcmsv9 | mysql |
  11. +---------------------+----------+--------------+------------------+
  13. 1 row in set (0.00 sec)
  15. mysql> show variables like "%log%";

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#需要看到这样的一行，说明binlog已经开启了:?log_bin?|?ON

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在master上为slave建立用户

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点击(此处)折叠或打开

  1. mysql> grant replication slave, reload, super on *.* to 'backup'@'192.168.10.198' identified by '123';

这样，主机配置完毕。
b、slave配置

点击(此处)折叠或打开

  1. [client]
  3. port = 3306
  5. socket = /tmp/mysql.sock
  7. [mysqld]
  9. port = 3306
  11. socket = /tmp/mysql.sock
  13. basedir=/usr/local/mysql
  15. datadir=/home/mysqldata
  17. log-slow-queries=slow_query.txt
  19. log-bin=mysql-bin198
  21. long_query_time=2
  23. skip-locking
  25. bind-address=192.168.10.198
  27. skip-name-resolve
  29. skip-innodb
  31. max_allowed_packet = 256M
  33. query_cache_size=256M
  35. max_connections=2000
  37. max_connect_errors=10000
  39. key_buffer_size=6000M
  41. read_buffer_size=32M
  43. read_rnd_buffer_size = 32M
  45. myisam_sort_buffer_size=256M
  47. tmp_table_size=512M
  49. old-passwords
  51. interactive_timeout=60
  53. wait_timeout=60
  55. connect_timeout=120
  57. table_cache=8192
  59. thread_cache_size=256
  61. sort_buffer_size=64M
  63. back_log = 500
  65. thread_concurrency=8
  66. ?
  67. server-id=2
  68. ?
  69. master-host=192.168.10.197
  70. ?
  71. master-user=backup
  72. ?
  73. master-password=123
  74. ?
  75. master-port=3306
  77. replicate-do-db=phpcmsv9
  78. ?
  79. replicate-ignore-db=mysql
  80. ?
  81. master-connect-retry=60
  82. ?
  83. expire_logs_days=10
  85. [mysqldump]
  87. quick
  89. max_allowed_packet = 1024M
  91. [mysql]
  93. no-auto-rehash
  95. [isamchk]
  97. key_buffer = 1024M
  99. sort_buffer_size = 32M
  101. read_buffer = 2M
  103. write_buffer = 2M
  105. [myisamchk]
  107. key_buffer = 1024M
  109. sort_buffer_size = 32M
  111. read_buffer = 2M
  113. write_buffer = 2M
  115. [mysqlhotcopy]
  117. interactive-timeout

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注释：红色部分为修改的地方

1.启动主服务器和从服务器服务，在从服务器192.168.17.2上使用命令slave?start启动复制;

2.随便使用命令show?slave?status;

如果出现主从复制报错了

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点击(此处)折叠或打开

  1. mysql> show slave status \G;
  3. *************************** 1. row ***************************
  5. Slave_IO_State: Connecting to master
  7. Master_Host: 192.168.10.197
  9. Master_User: backup
  11. Master_Port: 3306
  13. Connect_Retry: 60
  15. Master_Log_File: mysql-bin240.000001
  17. Read_Master_Log_Pos: 2342431
  19. Relay_Log_File: localhost-relay-bin.000001
  21. Relay_Log_Pos: 4
  23. Relay_Master_Log_File: mysql-bin240.000001
  25. Slave_IO_Running: No
  27. Slave_SQL_Running: Yes
  29. Replicate_Do_DB: phpcmsv9
  31. Replicate_Ignore_DB: mysql
  33. Replicate_Do_Table:
  35. Replicate_Ignore_Table:
  37. Replicate_Wild_Do_Table:
  39. Replicate_Wild_Ignore_Table:
  41. Last_Errno: 0
  43. Last_Error:
  45. Skip_Counter: 0
  47. Exec_Master_Log_Pos: 2342431
  49. Relay_Log_Space: 106
  51. Until_Condition: None
  53. Until_Log_File:
  55. Until_Log_Pos: 0
  57. Master_SSL_Allowed: No
  59. Master_SSL_CA_File:
  61. Master_SSL_CA_Path:
  63. Master_SSL_Cert:
  65. Master_SSL_Cipher:
  67. Master_SSL_Key:
  69. Seconds_Behind_Master: NULL
  71. Master_SSL_Verify_Server_Cert: No
  73. Last_IO_Errno: 1130
  75. Last_IO_Error: error connecting to master [email protected]:3306' - retry-time: 60 retries: 86400
  77. Last_SQL_Errno: 0
  79. Last_SQL_Error:
  81. 1 row in set (0.00 sec)
  83. ERROR:
  85. No query specified

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这是由于MASTER没有赋予权限的关系

3在从服务器192.168.17.2运行slave?stop;停止复制命令

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4输入

点击(此处)折叠或打开

  1. mysql>CHANGE MASTER to MASTER_HOST='192.168.15.197', MASTER_PORT=3306, MASTER_USER='backup', MASTER_PASSWORD='123', MASTER_LOG_FILE=’mysql-bin240.000001'；, MASTER_LOG_POS=2342775;

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5然后重新启动slave?start?命令后

点击(此处)折叠或打开

  1. mysql> show slave status \G;
  3. *************************** 1. row ***************************
  5. Slave_IO_State: Waiting for master to send event
  7. Master_Host: 192.168.10.197
  9. Master_User: backup
  11. Master_Port: 3306
  13. Connect_Retry: 60
  15. Master_Log_File: mysql-bin240.000001
  17. Read_Master_Log_Pos: 2342775
  19. Relay_Log_File: localhost-relay-bin.000002
  21. Relay_Log_Pos: 598
  23. Relay_Master_Log_File: mysql-bin240.000001
  25. Slave_IO_Running: Yes
  27. Slave_SQL_Running: Yes
  29. Replicate_Do_DB: phpcmsv9
  31. Replicate_Ignore_DB: mysql
  33. Replicate_Do_Table:
  35. Replicate_Ignore_Table:
  37. Replicate_Wild_Do_Table:
  39. Replicate_Wild_Ignore_Table:
  41. Last_Errno: 0
  43. Last_Error:
  45. Skip_Counter: 0
  47. Exec_Master_Log_Pos: 2342775
  49. Relay_Log_Space: 757
  51. Until_Condition: None
  53. Until_Log_File:
  55. Until_Log_Pos: 0
  57. Master_SSL_Allowed: No
  59. Master_SSL_CA_File:
  61. Master_SSL_CA_Path:
  63. Master_SSL_Cert:
  65. Master_SSL_Cipher:
  67. Master_SSL_Key:
  69. Seconds_Behind_Master: 0
  71. Master_SSL_Verify_Server_Cert: No
  73. Last_IO_Errno: 0
  75. Last_IO_Error:
  77. Last_SQL_Errno: 0
  79. Last_SQL_Error:
  81. 1 row in set (0.00 sec)
  83. ERROR:
  85. No query specified

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在从库192.168.17.2?select查询，发现后面插入的两条语句已经同步过来了，随后继续插入测试没有发现问题。

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