数据库的主从复制

先让两台服务器互通

确定两台都是有安装mysql的

实际环境可以让主机的防火墙给端口3306放行，这里 就直接关闭防火墙了

输入密码进入mysql 并向服务器中授权一个从数据库用户给从机，然后刷新一下数据库的状态

  ` mysql -uroot -p123.com`

授权

  `grant replication slave on *.*to'slvZ'@'192.168.2.%' identified by'123.com';`

修改配置文件

  `vim /etc/my.cnf`

  ``
        log-bin=master-bin
        log-slave-update=true


        # binary logging format - mixed recommended
        binlog_format=mixed

        # required unique id between 1 and 2^32 - 1
        # defaults to 1 if master-host is not set
        # but will not function as a master if omitted
        server-id       = 11

  ``

重启服务

  `systemctl restart mysqld`

进入mysql

  ``
        mysql> show master status;
        +-------------------+----------+--------------+------------------+
        | File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
        +-------------------+----------+--------------+------------------+
        | master-bin.000001 |      107 |              |                  |
        +-------------------+----------+--------------+------------------+
        1 row in set (0.00 sec)
  ``

需要记住这里的编码

去到从机修改配置文件

  ``
        vim /etc/my.cnf

        server-id       = 22

  ``

重启数据库

  `systemctl restart mysqld`

进入数据库

  ``
        mysql> slave stop;
        Query OK, 0 rows affected, 1 warning (0.00 sec)

        mysql> change master to master_host='192.168.2.9',master_user='slvZ',master_password='123.com',master_log_file='master-bin.000001',master_log_pos=107;
        Query OK, 0 rows affected (0.01 sec)

        mysql> start slave;
        Query OK, 0 rows affected (0.00 sec)

        mysql> show slave status\G
        #主要是看着两行
        Slave_IO_Running: Yes
        Slave_SQL_Running: Yes

  ``

之后测试一下主创建 从查看就好了