MySQL系列详解九:MySQL级联复制演示-技术流ken

前言

级联复制就是master服务器,只给后端一台slave服务器同步数据,然后这个slave服务器在向后端的所有slave服务器同步数据,这样就可以降低master服务器的写压力,和复制数据的网络IO。

实现级联复制演示

准备

主服务器IP:10.220.5.137

从1服务器IP:10.220.5.138

从2服务器IP:10.220.5.139

配置主服务器

开启二进制日志

mysql> show global variables like '%log_bin%';
+---------------------------------+--------------------------------------------+
| Variable_name | Value |
+---------------------------------+--------------------------------------------+
| log_bin | ON |
| log_bin_basename | /data/mysql/mysql3306/logs/mysql-bin |
| log_bin_index | /data/mysql/mysql3306/logs/mysql-bin.index |
| log_bin_trust_function_creators | ON |
| log_bin_use_v1_row_events | OFF |
+---------------------------------+--------------------------------------------+
rows in set (0.01 sec)

创建用于复制的用户

mysql> grant replication slave on *.* to 'ken'@'%' identified by 'xx';

查看主服务器端状态

需要查看现在主服务器端在哪个日志文件写入日志以及现在的位置

mysql> show master status\G
*************************** . row ***************************
File: mysql-bin.
Position:
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set: 987ac782-d7b8-11e8-a462-000c292218ec:-,
c01b1811-d7b3-11e8--000c29492f7b:-
row in set (0.00 sec)

配置从1服务器

与主服务器端建立连接

MySQL [(none)]> change master to master_host='10.220.5.137',master_user='ken',master_passowrd='xx',master_log_file='mysql-bin.000012',master_log_pos=;

启动slave

MySQL [(none)]> start slave;

查看连接状态

要确认IO以及SQL线程成功开启

ySQL [(none)]> show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.220.5.137
Master_User: ken
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
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:
Last_Error:
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 987ac782-d7b8-11e8-a462-000c292218ec
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 987ac782-d7b8-11e8-a462-000c292218ec:-
Executed_Gtid_Set: 987ac782-d7b8-11e8-a462-000c292218ec:-,
c01b1811-d7b3-11e8--000c29492f7b:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec)

查看从1服务器端状态

需要查看现在从1服务器端在哪个日志文件写入日志以及现在的位置

mysql> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000007
Position: 2057
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set: 987ac782-d7b8-11e8-a462-000c292218ec:1-13,
c01b1811-d7b3-11e8-8698-000c29492f7b:3-7
1 row in set (0.00 sec)

配置从2服务器端

与从1服务器端建立连接

MySQL [(none)]> change master to master_host='10.220.5.138',master_user='ken',master_passowrd='xx',master_log_file='mysql-bin.000007',master_log_pos=2057;

启动slave

MySQL [(none)]> start slave;

查看连接状态

要确认IO以及SQL线程成功开启

ySQL [(none)]> show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.220.5.138
Master_User: ken
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
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:
Last_Error:
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 987ac782-d7b8-11e8-a462-000c292218ec
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 987ac782-d7b8-11e8-a462-000c292218ec:-
Executed_Gtid_Set: 987ac782-d7b8-11e8-a462-000c292218ec:-,
c01b1811-d7b3-11e8--000c29492f7b:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec)

测试

现在从2服务器是从从1服务器端同步的数据,没有直接和主服务器端建立连接,而是通过从1间接的进行了连接。现在在主服务器端建库建表,查看从2服务器是否有主服务器端的库和表。

主服务器建库建表

mysql> create database ken6;              <<建立数据库ken6
mysql> use ken6; <<切换至ken6
Database changed
mysql> create table ken(id int); <<创建表ken
Query OK, rows affected (0.02 sec) mysql> insert into ken values (),(); <<插入数据
Query OK, rows affected (0.01 sec)
Records: Duplicates: Warnings: mysql> select * from ken; <<查看刚才插入的数据
+------+
| id |
+------+
| |
| |
+------+
rows in set (0.00 sec)

在从1服务器端查看已经同步过来了主服务器端新建的库和表

MySQL [(none)]> select * from ken6.ken;
+------+
| id |
+------+
| |
| |
+------+

在从2检查发现也已经同步过来了主服务器端的库和表,这样就完后了级联复制的操作

MySQL [(none)]> select * from ken6.ken;
+------+
| id |
+------+
| |
| |
+------+
rows in set (0.00 sec)
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