1,背景需求

由於現網的環境，經過近期監控，發現MYSQL主庫的IO讀寫壓力比較大，需要部署新的MYSQL從庫，進一步分攤MYSQL主庫的壓力，以及現存MYSQL從庫的讀負載。為了減少對於MYSQL主庫的IO讀取效能衝擊，採用基於MYSQL現存從庫構建新的MYSQL從庫。

2，現存的資料庫架構

編號 IP地址資料庫角色

1 10.0.0.12 資料庫主庫

2 10.0.0.16 資料庫從庫1

3，準備好一個新的資料庫從庫2

編號 IP地址資料庫角色

3 10.0.0.14 資料庫從庫2

4，在新的資料庫從庫2，配置server_id=3,區別於上述2個節點

5，在資料庫從庫1，關閉sql thread,為了實現MYSQLDUMP備份的資料一致性；

mysql> system hostname

standby3

mysql> stop slave;

Query OK, 0 rows affected (0.01 sec)

6，在資料庫從庫1，獲取show slave status之如下標註的2個列

（注：用於基於這個列的值，用於後續構建新的MYSQL從庫）

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State:

Master_Host: 10.0.0.12

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: binlog.000002

Read_Master_Log_Pos: 120

Relay_Log_File: standby3-relay-bin.000004

Relay_Log_Pos: 280

Relay_Master_Log_File: binlog.000002 ---應用主庫二進位制日誌

Slave_IO_Running: No

Slave_SQL_Running: No

Replicate_Do_DB:

Replicate_Ignore_DB:

Replicate_Do_Table:

Replicate_Ignore_Table:

Replicate_Wild_Do_Table:

Replicate_Wild_Ignore_Table:

Last_Errno: 0

Last_Error:

Skip_Counter: 0

Exec_Master_Log_Pos: 120 ---應用主庫二進位制日誌的位置

Relay_Log_Space: 500

Until_Condition: None

Until_Log_File:

Until_Log_Pos: 0

Master_SSL_Allowed: No

Master_SSL_CA_File:

Master_SSL_CA_Path:

Master_SSL_Cert:

Master_SSL_Cipher:

Master_SSL_Key:

Seconds_Behind_Master: NULL

Master_SSL_Verify_Server_Cert: No

Last_IO_Errno: 0

Last_IO_Error:

Last_SQL_Errno: 0

Last_SQL_Error:

Replicate_Ignore_Server_Ids:

Master_Server_Id: 1

Master_UUID: 65fddb9f-fd33-11e9-95f0-080027d1f3fc

Master_Info_File: /var/lib/mysql/master.info

SQL_Delay: 0

SQL_Remaining_Delay: NULL

Slave_SQL_Running_State:

Master_Retry_Count: 86400

Master_Bind:

Last_IO_Error_Timestamp:

Last_SQL_Error_Timestamp:

Master_SSL_Crl:

Master_SSL_Crlpath:

Retrieved_Gtid_Set:

Executed_Gtid_Set:

Auto_Position: 0

1 row in set (0.00 sec)

ERROR:

No query specified

mysql>

7，在MYSQL從庫1匯出資料庫備份

[root@standby3 mysql]# mysqldump -uroot -psystem --databases zxydb >/dump_dir/for_create_2_slave.dump

Warning: Using a password on the command line interface can be insecure.

[root@standby3 mysql]#

8，重啟MYSQL從庫1的SQL THREAD

mysql> start slave sql_thread;

Query OK, 0 rows affected (0.01 sec)

9，把MYSQL從庫1 複製資料庫份到 MYSQL從庫2

[root@standby2mysql mysql]# mkdir -p /dump_dir

[root@standby2mysql mysql]#

[root@standby3 mysql]# scp /dump_dir/for_create_2_slave.dump root@10.0.0.14:/dump_dir/

root@10.0.0.14's password:

for_create_2_slave.dump 100% 2530 2.5KB/s 00:00

[root@standby3 mysql]#

10，在MYSQL從庫2匯入DUMP檔案

[root@standby2mysql mysql]# mysql -uroot -psystem </dump_dir/for_create_2_slave.dump

Warning: Using a password on the command line interface can be insecure.

[root@standby2mysql mysql]#

[root@standby2mysql mysql]# mysql -uroot -psystem

Warning: Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.6.25-enterprise-commercial-advanced-log MySQL Enterprise Server - Advanced Edition (Commercial)

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;

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

| Database |

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

| information_schema |

| mysql |

| performance_schema |

| test |

| zxydb |

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

5 rows in set (0.00 sec)

11，在MYSQL主庫建立用於構建MYSQL從庫2連線MYSQL主庫的複製資料庫使用者

mysql> create user 'repl'@'10.0.0.14' identified by 'system';

Query OK, 0 rows affected (0.00 sec)

mysql> grant replication slave on *.* to 'repl'@'10.0.0.14';

Query OK, 0 rows affected (0.00 sec)

12，在MYSQL從庫2構建至MYSQL主庫的主從複製關係

mysql> change master to master_host='10.0.0.12',master_user='repl',master_password='system',master_log_file='binlog.000002',master_log_pos=120;

Query OK, 0 rows affected, 2 warnings (0.03 sec)

13，在MYSQL從庫2 啟動主從複製服務

mysql> start slave;

Query OK, 0 rows affected (0.01 sec)

14，在MYSQL從庫2檢視主從複製執行

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 10.0.0.12

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: binlog.000002

Read_Master_Log_Pos: 437

Relay_Log_File: standby2mysql-relay-bin.000003

Relay_Log_Pos: 280

Relay_Master_Log_File: binlog.000002

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Replicate_Do_DB:

Replicate_Ignore_DB:

Replicate_Do_Table:

Replicate_Ignore_Table:

Replicate_Wild_Do_Table:

Replicate_Wild_Ignore_Table:

Last_Errno: 0

Last_Error:

Skip_Counter: 0

Exec_Master_Log_Pos: 437

Relay_Log_Space: 938

Until_Condition: None

Until_Log_File:

Until_Log_Pos: 0

Master_SSL_Allowed: No

Master_SSL_CA_File:

Master_SSL_CA_Path:

Master_SSL_Cert:

Master_SSL_Cipher:

Master_SSL_Key:

Seconds_Behind_Master: 0

Master_SSL_Verify_Server_Cert: No

Last_IO_Errno: 0

Last_IO_Error:

Last_SQL_Errno: 0

Last_SQL_Error:

Replicate_Ignore_Server_Ids:

Master_Server_Id: 1

Master_UUID: 65fddb9f-fd33-11e9-95f0-080027d1f3fc

Master_Info_File: /var/lib/mysql/master.info

SQL_Delay: 0

SQL_Remaining_Delay: NULL

Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

Master_Retry_Count: 86400

Master_Bind:

Last_IO_Error_Timestamp:

Last_SQL_Error_Timestamp:

Master_SSL_Crl:

Master_SSL_Crlpath:

Retrieved_Gtid_Set:

Executed_Gtid_Set:

Auto_Position: 0

1 row in set (0.00 sec)

ERROR:

No query specified

15，驗證MYSQL主庫與新部署的MYSQL從庫2 資料同步正常

--MYSQL主庫

mysql> use zxydb;

Database changed

mysql> insert into t_go select 5,5;

Query OK, 1 row affected (0.01 sec)

Records: 1 Duplicates: 0 Warnings: 0

mysql> commit;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from t_go;

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

| a | b |

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

| 1 | 1 |

| 2 | 2 |

| 3 | 3 |

| 5 | 5 |

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

4 rows in set (0.00 sec)

---MYSQL從庫2

mysql> select * from zxydb.t_go;

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

| a | b |

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

| 1 | 1 |

| 2 | 2 |

| 3 | 3 |

| 5 | 5 |

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

4 rows in set (0.00 sec)

16，在MYSQL主庫執行，可見現配置2個MYSQL從庫

mysql> show slave hosts;

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

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

| 3 | | 3306 | 1 | 699a379f-e36d-11e9-a4e2-0800274dcc79 |

| 2 | | 3306 | 1 | 891bc123-fd72-11e9-8cf5-080027dddbcd |

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

2 rows in set (0.00 sec)

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