Linux 之 MySQL(mariadb) 主从复制

一、mysql 之 master

  1、关闭防火墙,SELinux 【或者写一条防火墙入栈规则也行】

systemctl  stop firewalld
systemctl  disable firewalld
vim /etc/selinux/config
第七行enforcing 改为 disabled

或者写入防火墙规则:
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --add-port=80/udp --permanent
firewall-cmd --reload <------ 重载firewalld

  2、修改配置文件my.cnf  :vim  /etc/my.cnf

#配置mysql 的server ,client 的默认字符集为utf8
[mysqld] character
-set-server=utf8 collation-server=utf8_general_ci log-error=/var/log/mysqld.log

#设置master
server-id=1

#开启二进制日志
log-bin=mysql_binlog
[client] default
-character-set=utf8 [mysql] default-character-set=utf8

   3、进入数据库,创建一个用于主从同步的账号

mysql>create user 'slave'@'%' identified by '666666';

  4、给创建账号授权,允许同步

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

  5、锁定数据库,防止数据写入

mysql> flush tables with read lock;

  6、配置完从库后,主库解锁

mysql> unlock tables;

  7、主库执行:show master status; 记下 Position 和 File 的值,等下进行从库配置要用到

  +------------------+----------+--------------+------------------+
  | File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
  +------------------+----------+--------------+------------------+
  | mysql-binlog.000023 | 2720 | test1,test2 | mysql 
  +------------------+----------+--------------+------------------+

 

 

二、mysql 之slave

  1、修改配置文件my.cnf

 

#配置mysql 的server ,client 的默认字符集为utf8
[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci
log-error=/var/log/mysqld.log

#设置slave
server-id=3

#开启只允许读
read-only=true

[client]
default-character-set=utf8
[mysql]
default-character-set=utf8

 

  2、设置从库同步的master信息

mysql> change master to master_host='主库ip' , master_user='主库设置的用户slave', master_password='666666',master_log_file='mysql_binlog.000023',mysql_log_pos=470;

 

  3、开启主从同步

mysql> start slave;

  4、查看信息

mysql> show slave status\G;

  5、Slave_IO_Running、Slave_SQL_Running 都是yes 则表示配置成功

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.119.10
                  Master_User: tiger
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 1039
               Relay_Log_File: slave-relay-bin.000002
                Relay_Log_Pos: 537
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

  【如果不是两个yes,请先检查防火墙、selinux有没有关闭……】

posted @ 2019-11-13 16:29  上官若凌  阅读(129)  评论(0编辑  收藏  举报