mysql Advanced Usage (1) - Main mariadb Introduction 1 (installed) centos7 yum install mysql from building Mariadb

Mariadb description:

　　mariadb is a branch of mysql, the need for further understanding of reference: https://mariadb.org/

　　Installation Tutorial: window Installation: MariaDB Introduction 1 (installed)

　　　　　　　　　linux Installation: centos7 yum install mysql | mariaDb

Added: mysql from the master copy (master-slave), I will take mariadb to demonstrate

Mariadb master-slave replication:

　　1> Rationale:

　　　　The basic data replication between MySQL binary log file (binary log file). A MySQL database Once the binary logging is enabled, as a master, its database all the operations are to "events" recorded in the binary log, other databases as slave O threads with the primary server to maintain communication through an I /, and changes in the binary log file monitoring master, and if we find master binary log file is changed, it will copy the changes to their relay log in, then a slave SQL thread will related to "events" to perform its own database , in order to achieve the consistency of the database and primary database, we realized the master-slave replication.

　　2> achieve master MySQL from the desired configuration:

　　　　1> to prepare two servers

　　　　　　master 192.168.248,147 /linux (centos7)

　　　　　　slave 192.168.248.148 /linux (centos7)

After installation centos7 mariadb, no default password 

. 1 > -uroot-mysql - P carriage
 2 > use mysql; switch to mysql database
 . 3 > Update User SET password = password ( " custom password " ) WHERE User = ' the root ' ; 
 . 4 > flush privileges; refresh the effect

　　　　2> configure the master server (server 147)

1 > modify the configuration file: 
[mysqld] 
log -bin = MySQL- bin binary log # Open 
Server -id = 1 # Server- Set ID

2> 重启mysql，创建用于同步的用户账号
mysql> CREATE USER 'huhy'@'192.168.248.147' IDENTIFIED BY 'huhy';#创建用户
mysql> GRANT REPLICATION SLAVE ON *.* TO 'huhy'@'192.168.248.147';#分配权限
mysql>flush privileges;   #刷新权限
3> 查看master状态，记录二进制文件名(mysql-bin.000001)和位置(569)：
SHOW MASTER STATUS;

　　3>从服务器slave修改：

从服务器配置：
1>my.cnf配置文件，添加server-id
[mysqld]
server-id=2 #设置server-id，必须唯一

2>重启mysql，打开mysql会话，执行同步SQL语句(需要主服务器主机名，登陆凭据，二进制文件的名称和位置)：

CHANGE MASTER TO MASTER_HOST='192.168.248.147',MASTER_USER='huhy',MASTER_PASSWORD='huhy', MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=569;
3> 启动同步进程：
　　start slave;   【stop slave】

4> 查看slave状态：

　　　　show slave status\G;

注意：这个当其中两个都是yes的时候代码同步开启成功。　　

　　问题：这个可能会出现个问题， Slave_IO_Running: Connecting  连接问题： 如下：

产生这个问题的原因是我们创建的同步用户无法进行远程连接，从服务器无法连接到主服务器：

　　grant all privileges on *.* to huhy@'%'identified by 'huhy'; 授权后即可

　　flush privileges; 刷新权限

　执行后即可完成同步

补充：可以再my.cnf中设置同步哪些数据库：

# 不同步哪些数据库  
binlog-ignore-db = mysql  

  
# 只同步哪些数据库，除此之外，其他不同步  
binlog-do-db = test

测试：

到这mysql的主从复制已经搞好了，有不理解的可以一起讨论