mysql主从复制配置过程及演示

Posted 2020-09-20

1.设置server-id值并开启binlog功能参数

编辑/data/3306/my.cnf:

[mysqld]

server-id = 6                    #主库和从库的server-id不能相同

log_bin = /data/3306/mysql-bin   #

 

重启服务

/data/3306/mysql restart

 

检查思路1：

[[email protected] data]# egrep "log_bin|server-id" 330*/my.cnf

3306/my.cnf:log_bin = /data/3306/mysql-bin

3306/my.cnf:server-id = 6

 

3307/my.cnf:server-id = 7

 

检查思路2：

登录：

[[email protected] data]# mysql -S /data/3306/mysql.sock

查看变量：

mysql> show variables like ‘log_bin%‘;#查看主库的binlog是否存在                    

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

| Variable_name                   | Value                      |

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

| log_bin                         | ON                         |

| log_bin_basename                | /data/3306/mysql-bin       |

| log_bin_index                   | /data/3306/mysql-bin.index |

| log_bin_trust_function_creators | OFF                        |

| log_bin_use_v1_row_events       | OFF                        |

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

5 rows in set (0.00 sec)

查看原主库数据库中原有库

[[email protected] data]# mysql   -S /data/3306/mysql.sock

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

Your MySQL connection id is 41

Server version: 5.6.34-log Source distribution

 

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

 

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 |

| cc2                |

| mysql              |

| performance_schema |

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

4 rows in set (0.00 sec)

 

mysql>

查看从库中原有库

mysql> show  databases;

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

| Database           |

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

| information_schema |

| cc                 |

| mysql              |

| performance_schema |

| test               |

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

6 rows in set (0.00 sec)

 

mysql>

 

 

2、建账号授权【主库】

grant replication slave on *.* to ‘rep‘@‘172.16.1.%‘ identified by ‘cc123‘;

flush privileges;

 

3、锁表导出数据

mysql> flush table with read lock;

Query OK, 0 rows affected (0.00 sec)

 

查看位置：

mysql> show master status;

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

| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000001 |      405 |              |                  |                   |

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

1 row in set (0.00 sec)

 

新开窗口备份：

mysqldump -uroot -p‘cc123‘ -S /data/3306/mysql.sock -A -B |gzip >/server/backup/mysql_bak.$(date +%F).sql.gz

 

原窗口解锁：

mysql> show master status;

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

| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000001 |      405 |              |                  |                   |

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

1 row in set (0.00 sec)

mysql> unlock tables;

Query OK, 0 rows affected (0.01 sec)

 

如下命令可替代3的所有步骤

mysqldump -uroot -p‘cc123‘ --master-data=2 -S /data/3306/mysql.sock -A -B

zcat mysql_bak.2017-05-04.sql.gz >mysql_bak.2017-05-04.sql

 

4、将数据导入到从库

[[email protected] backup]# mysql -S /data/3307/mysql.sock <mysql_bak.2017-05-04.sql

 

5、让从库从主库锁表时刻记录的binlog位置点开始向下同步

CHANGE MASTER TO  

MASTER_HOST=‘172.16.1.52‘,

MASTER_PORT=3306,

MASTER_USER=‘rep‘,

MASTER_PASSWORD=‘cc123‘,

MASTER_LOG_FILE=‘mysql-bin.000028‘,

MASTER_LOG_POS=1728;

 

#GTID

这时可见master.info已经产生在从库/data 目录下

[[email protected] data]# cd /data/3307/data/

[[email protected] data]# ls

auto.cnf    cc2          ib_logfile1  mysql             mysql-bin.000003  mysql-bin.000006  mysql-bin.000009  mysql-bin.000012  mysql-bin.000015  performance_schema

binlog.sql  ibdata1      ib_logfile2  mysql-bin.000001  mysql-bin.000004  mysql-bin.000007  mysql-bin.000010  mysql-bin.000013  mysql-bin.000016  test

cc          ib_logfile0  master.info  mysql-bin.000002  mysql-bin.000005  mysql-bin.000008  mysql-bin.000011  mysql-bin.000014  mysql-bin.index

[[email protected] data]#

 

 

6、启动同步开关

mysql> start slave;

Query OK, 0 rows affected (0.01 sec)

 

7、检查

[[email protected] backup]# mysql -S /data/3307/mysql.sock -e "show slave st

atus\G"|egrep -i "Yes|Behind_Master"

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

        Seconds_Behind_Master: 0

 

检查3307里是否同步主库

[[email protected] data]# mysql   -S /data/3307/mysql.sock

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

Your MySQL connection id is 47

Server version: 5.6.34-log Source distribution

 

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

 

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 |

| cc                 |

| cc2                |

| mysql              |

| performance_schema |

| test               |

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

6 rows in set (0.00 sec)

 

mysql>

在cc2库下student表中插入内容

这时我们在往3306里插入内容就会发现已经同步过来了

 

[[email protected] data]# mysql   -S /data/3306/mysql.sock

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

Your MySQL connection id is 42

Server version: 5.6.34-log Source distribution

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

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> use cc2;

 

mysql> insert into student(`id`,`name`) VALUES(8,‘bb‘);

 

mysql> insert into student(`id`,`name`) VALUES(8,‘bb‘);

 

mysql> insert into student(`id`,`name`) VALUES(8,‘bb‘);

 

mysql> select * from student;

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

| id | name | age | dept |

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

|  5 | DD   |   0 | NULL |

|  6 | cc   |   0 | NULL |

|  7 | bb   |   0 | NULL |

|  8 | bb   |   0 | NULL |

|  8 | bb   |   0 | NULL |

|  8 | bb   |   0 | NULL |

|  8 | bb   |   0 | NULL |

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

7 rows in set (0.00 sec)

[[email protected] data]# mysql   -S /data/3307/mysql.sock

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

Your MySQL connection id is 48

Server version: 5.6.34-log Source distribution

 

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

 

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> use cc2;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

 

Database changed

mysql> select * from student;

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

| id | name | age | dept |

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

|  5 | DD   |   0 | NULL |

|  6 | cc   |   0 | NULL |

|  7 | bb   |   0 | NULL |

|  8 | bb   |   0 | NULL |

|  8 | bb   |   0 | NULL |

|  8 | bb   |   0 | NULL |

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

6 rows in set (0.00 sec)

 

mysql>

 

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