卸載過(guò)程：

停止服務(wù)：systemctl stop mariadb

查詢安裝包：rpm -qa | grep mariadb

卸載：

rpm -e mariadb-server

rpm -e mariadb

rpm -e --nodeps mariadb-libs

1.?準(zhǔn)備環(huán)境

1.1?查看磁盤掛載情況：df–h

PS: 在虛擬機(jī)設(shè)置里?對(duì)以下步驟進(jìn)行操作：

(如果開機(jī)自動(dòng)掛載到桌面上[帶桌面的Linux系統(tǒng)]，那么需要卸載，然后再進(jìn)行重新掛載)

卸載：umonut/dev/cdrom

掛載：mount /dev/cdrom /media

1.1?使用本地yum源：

配置本地yum：cd /etc/yum.repos.d/

創(chuàng)建一個(gè)文件(以repo結(jié)尾)，如：yum.repo，文件內(nèi)容如下：進(jìn)行配置：

1.?開始安裝

1.1?執(zhí)行命令：yum -y install mariadb mariadb-server

1.2?拷貝文件：cp /usr/share/mysql/my-huge.cnf /etc/my.cnf

1.3?用root帳號(hào)登錄后，在/etc/my.cnf中的[mysqld]后添加添加lower_case_table_names=1，重啟MYSQL服務(wù)，這時(shí)已設(shè)置成功：不區(qū)分表名的大小寫。

1.4?啟動(dòng)mariadb服務(wù)并開機(jī)自動(dòng)運(yùn)行。命令如下：

systemctl start mariadb

systemctl enable mariadb

1.1?查看防火墻狀態(tài)：systemctl status firewalld

停止防火墻：systemctl stop firewalld

設(shè)置開機(jī)不啟用防火墻：systemctldisablefirewalld

1.2?開始設(shè)置Mariadb數(shù)據(jù)庫(kù),執(zhí)行腳本：/usr/bin/mysql_secure_installation

按照下面提示進(jìn)行操作即可：

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB

SERVERS IN PRODUCTION USE! ?PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current

password for the root user. ?If you've just installed MariaDB, and

you haven't set the root password yet, the password will be blank,

so you should just press enter here.

Enter current password for root (enter for none): 安裝后默認(rèn)沒有root密碼，直接回車

OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB

root user without the proper authorisation.

Set root password? [Y/n] Y

New password: 輸入root的新密碼

Re-enter new password: 新密碼確認(rèn)

Password updated successfully!

Reloading privilege tables..

... Success!

By default, a MariaDB installation has an anonymous user, allowing anyone

to log into MariaDB without having to have a user account created for

them. ?This is intended only for testing, and to make the installation

go a bit smoother. ?You should remove them before moving into a

production environment.

Remove anonymous users? [Y/n] 刪除匿名用戶 Y

... Success!

Normally, root should only be allowed to connect from 'localhost'. ?This

ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] 關(guān)閉root遠(yuǎn)程登錄 Y

... Success!

By default, MariaDB comes with a database named 'test' that anyone can

access. ?This is also intended only for testing, and should be removed

before moving into a production environment.

Remove test database and access to it? [Y/n] 刪除test數(shù)據(jù)庫(kù) Y

- Dropping test database...

... Success!

- Removing privileges on test database...

... Success!

Reloading the privilege tables will ensure that all changes made so far

will take effect immediately.

Reload privilege tables now? [Y/n] 確定以上所有操作 Y

... Success!

Cleaning up...

All done! ?If you've completed all of the above steps, your MariaDB

installation should now be secure.

Thanks for using MariaDB!

1.?配置MariaDB主從

1.1?修改vim /etc/my.cnf配置文件：

主節(jié)點(diǎn)不需要進(jìn)行修改

從節(jié)點(diǎn)進(jìn)行修改 server-id=2

PS:進(jìn)行重啟從節(jié)點(diǎn)(slave)：systemctl restart mariadb

1.1?在主節(jié)點(diǎn)上建立賬戶并且授權(quán)Slave

登錄MariaDB數(shù)據(jù)庫(kù)：mysql -uroot -proot

建立主從復(fù)制用戶并授權(quán)：

語(yǔ)法：

GRANT REPLICATION SLAVE ON *.*{所有權(quán)限}TO 'slave'@'%'{用戶名為slave，%為任意地址}identified by'slave';

命令：

GRANT REPLICATION SLAVE ON *.* TO 'slave'@'%'identified by'slave';

1.2?查詢SQL(Master的狀態(tài))命令：SHOW MASTER STATUS;

1.1?配置從節(jié)點(diǎn)SLAVE：(注意在從節(jié)點(diǎn)上執(zhí)行)

登錄從服務(wù)器：mysql -u root –proot進(jìn)行配置：

語(yǔ)法：

CHANGE MASTER TO

MASTER_HOST='主節(jié)點(diǎn)的IP地址', MASTER_USER='主節(jié)點(diǎn)授權(quán)的用戶', MASTER_PASSWORD='主節(jié)點(diǎn)授權(quán)的用戶的密碼',MASTER_LOG_FILE='mysql-bin.000007',MASTER_LOG_POS=2197;

命令：

CHANGE MASTER TO MASTER_HOST='192.168.1.31',MASTER_USER='slave',MASTER_PASSWORD='slave',MASTER_LOG_FILE='mysql-bin.000007',MASTER_LOG_POS=2197;

PS:注意語(yǔ)法逗號(hào)前后不要用空格。

1.2?查看主從狀態(tài)驗(yàn)證：

命令：show slave status\G;

1.1?授權(quán)遠(yuǎn)程用戶root登錄：(主從都需要進(jìn)行執(zhí)行)

1.1.1?GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;

1.1.2?FLUSH PRIVILEGES;

進(jìn)入slave服務(wù)器，運(yùn)行：

MySQL> show slave status\G

.......

Relay_Log_File: localhost-relay-bin.000535

Relay_Log_Pos: 21795072

Relay_Master_Log_File: localhost-bin.000094

Slave_IO_Running: Yes

Slave_SQL_Running:?No

Replicate_Do_DB:

Replicate_Ignore_DB:

......

解決辦法一、

Slave_SQL_Running: No

1.程序可能在slave上進(jìn)行了寫操作

2.也可能是slave機(jī)器重起后，事務(wù)回滾造成的.

一般是事務(wù)回滾造成的：

解決辦法：

mysql> stop?slave ;

mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;

mysql> start?slave ;

解決辦法二、

首先停掉Slave服務(wù)：slave stop

到主服務(wù)器上查看主機(jī)狀態(tài)：

記錄File和Position對(duì)應(yīng)的值

進(jìn)入master

mysql> show master status;

+----------------------+----------+--------------+------------------+

| File?????????????????| Position | Binlog_Do_DB | Binlog_Ignore_DB |

+----------------------+----------+--------------+------------------+

| localhost-bin.000094 | 33622483 |??????????????|??????????????????|

+----------------------+----------+--------------+------------------+

1 row in set (0.00 sec)

然后到slave服務(wù)器上執(zhí)行手動(dòng)同步：

mysql> change master to

> master_host='master_ip',

> master_user='user',

> master_password='pwd',

> master_port=3306,

> master_log_file=localhost-bin.000094',

> master_log_pos=33622483?;

1 row in set (0.00 sec)

mysql> start?slave ;

1 row in set (0.00 sec)

mysql> show slave status\G

*************************** 1. row ***************************

........

Master_Log_File: localhost-bin.000094

Read_Master_Log_Pos: 33768775

Relay_Log_File: localhost-relay-bin.000537

Relay_Log_Pos: 1094034

Relay_Master_Log_File: localhost-bin.000094

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Replicate_Do_DB:

手動(dòng)同步需要停止master的寫操作！

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