mysql主从配置

接前文 https://www.cnblogs.com/wscsq789/p/12262969.html，这里配置主从库同步配置

主库配置：

[root@guangzhou my.cnf.d]# pwd
/etc/my.cnf.d

#新增同步配置
[root@guangzhou my.cnf.d]# vim server.cnf 
[mysqld]
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
log-bin=mysql-bin
binlog_format=mixed
server-id=1
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

#导出所有数据库数据，一会需要再从库导入
[root@guangzhou my.cnf.d]# mysqldump -uroot -p --all-databases > ~/sync_dump_all.sql 

#重启mariadb服务
[root@guangzhou my.cnf.d]# systemctl restart mariadb

[root@guangzhou my.cnf.d]# mysql -h 127.0.0.1 -u root -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or g.
Your MariaDB connection id is 16
Server version: 10.2.31-MariaDB-log MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

#新增同步用户
MariaDB [(none)]> create user 'sync_user'@'%' identified by '666';

#从库账号授权
MariaDB [(none)]> grant replication slave on *.* to 'sync_user'@'%';

#检查新建的账号
MariaDB [(none)]> select user,host from mysql.user;

#检查账号授权
MariaDB [(none)]> show grants for sync_user@'%';

#打印主库状态
MariaDB [(none)]> show master statusG;
*************************** 1. row ***************************
            File: mysql-bin.000001
        Position: 831
    Binlog_Do_DB: 
Binlog_Ignore_DB: mysql,information_schema
1 row in set (0.00 sec)

ERROR: No query specified

从库配置:

[root@VM_0_11_centos my.cnf.d]# pwd
/etc/my.cnf.d

#新增配置
[root@VM_0_11_centos my.cnf.d]# vim server.cnf
[mysqld]
server-id=3
read-only=true

#重启mariadb
[root@VM_0_11_centos my.cnf.d]# systemctl restart mariadb
[root@VM_0_11_centos my.cnf.d]# mysql -h 127.0.0.1 -u root -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or g.
Your MariaDB connection id is 11
Server version: 10.2.31-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

#设置同步配置,此处master_log_file需要和主库配置项log-bin保持一致
MariaDB [(none)]> change master to master_host='172.16.0.15',master_user='sync_user',
　　　　　　　　　　 master_password='123456', master_log_file='mysql-bin.000001', master_log_pos=831;

#启动从库
MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)

#Slave_IO_Running: 复制master主机binlog日志文件里的sql到本机的relay-log文件里
#Slave_SQL_Running: 读取I/O线程写入的relay log。并且根据relay log的内容对slave数据库做相应的操作
#Slave_IO_Running和Slave_SQL_Running均为Yes说明设置成功

MariaDB [(none)]> show slave statusG;
 *************************** 1. row *************************** 
Slave_IO_State: Waiting for master to send event Master_Host: 172.16.0.15
Master_User: sync_user Master_Port: 3306 Connect_Retry: 60
Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 831
Relay_Log_File: VM_0_11_centos-relay-bin.000005
Relay_Log_Pos: 555
Relay_Master_Log_File: mysql-bin.000001
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: 831 
Relay_Log_Space: 1172 
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_SSL_Crl: 
Master_SSL_Crlpath: 
Using_Gtid: 
No Gtid_IO_Pos: 
Replicate_Do_Domain_Ids: 
Replicate_Ignore_Domain_Ids: 
Parallel_Mode: conservative 
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 1 row in set (0.00 sec) ERROR: No query specified

 完成上面配置后，同时开两个窗口分别连接主从库服务器，做增删改前选择test库做下对比：

 主库新增测试表：

从库：

主库录入几条测试数据：

 再看下从库：

 目前看下来数据已经同步成功了，并且可以知道的是从库牵涉到连个线程，一个是io读取，一个是sql写入