设置主从数据库的目的是将数据库1和数据库2分别建在两个虚拟机上，并实现数据互通访问 首先准备两个虚拟机，这里示例ip分别为： 192.168.200.10；192.168.200.20 修改主机名，一个是mysql1，一个是mysql2，（可改可不改，方便区别而已，我后续一个是mysql1一个是samba）， 然后关闭SELinux和防火墙，并修改hosts的配置文件，下图增加的最后两行是自己虚拟机的ip和主机名，无需和我一样 配置yum源，安装数据库服务，注意如何配置yum源，不再重复细节，可以参考云计算1中ftp安装篇，现在设置里检查DVD光盘文件是否连接，再进行以下操作 [root@localhost~]#mount /dev/cdrom /opt/centos 将cd设备挂载到/opt/centos,不存在的话可以先创建 [root@localhost~]#mkdir -p /opt/centos [root@localhost~]#cd /opt [root@localhost~]#ll 查看是否创建成功 total 636则挂载成功
[root@localhost~]#mv /etc/yum.repos.d/* /media/ 移除repos.d下的文件 [root@localhost~]#vi /etc/yum.repos.d/local.repo 创建local文件 [centos7] name=cantos7 baseurl=file:///opt/centos gpgcheck=0 enabled=1 [root@localhost~]#cat /etc/yum.repos.d/local.repo 查看 进行数据库服务的安装 [root@mysql1 ~]# yum install -y mariadb mariadb-server 两台虚拟机一样操作到这一步，然后同样启动数据库服务 [root@mysql1 /]# systemctl start mariadb [root@mysql1 /]# systemctl enable mariadb 初始化数据库并进行配置 [root@mysql1 /]# mysql_secure_installation 接下来按照提示，set root password?，y，root，000000，remove anonymous users?,y,Disallow root login remotely? ,n remove test database and access to it?,y,Reload privilege tables now? y 配置mysql1主节点，注意server_id是ip的结束数字 进入数据库，使用数据库命令语句创建一个叫test的数据库，在test下创建叫company的表格 [root@mysql1 /]# systemctl restart mariadb [root@mysql1 /]# mysql -uroot -p000000 Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 2 Server version: 5.5.44-MariaDB-log MariaDB Server
Copyright © 2000, 2015, Oracle, MariaDB Corporation Ab and others.
Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.
MariaDB [(none)]> grant all privileges on . to root@‘%’ identified by “000000”; Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> grant replication slave on . to ‘user’@‘samba’ identified by’000000’; Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> create database test; Query OK, 1 row affected (0.00 sec)
MariaDB [(none)]> use test; Database changed MariaDB [test]> create table company(id int not null primary key,name varchar(50),addr varchar(255)); Query OK, 0 rows affected (0.01 sec)
MariaDB [test]> insert into company values(1,‘alibaba’,‘china’); Query OK, 1 row affected (0.00 sec)
MariaDB [test]> select*from company; ±—±--------±------+ | id | name | addr | ±—±--------±------+ | 1 | alibaba | china | ±—±--------±------+ 1 row in set (0.00 sec) 这样主数据库就配置好了 配置从数据库的节点 [root@samba ~]# systemctl restart mariadb [root@samba ~]# mysql -uroot -p000000 MariaDB [(none)]> change master to master_host=‘mysql1’,master_user=‘user’,master_password=‘000000’; Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> start slave; Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: mysql1 Master_User: user Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 527 Relay_Log_File: mariadb-relay-bin.000002 Relay_Log_Pos: 811 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes 配置成功，开始验证主从数据库的关联功能，试试能否在虚拟机2也就是从数据库访问到刚才在主数据库建立的表格信息
MariaDB [(none)]> show databases; ±-------------------+ | Database | ±-------------------+ | information_schema | | mysql | | performance_schema | | test | ±-------------------+ 4 rows in set (0.00 sec)
MariaDB [(none)]> use test; 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 MariaDB [test]> show tables; ±---------------+ | Tables_in_test | ±---------------+ | company | ±---------------+ 1 row in set (0.00 sec)
MariaDB [test]> select*from company; ±—±--------±------+ | id | name | addr | ±—±--------±------+ | 1 | alibaba | china |
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