Linux 搭建数据库 Mariadb 主主主从半同步复制

冷不防 2023-06-27 05:53 29阅读 0赞

# MariaDB #

MariaDB数据库管理系统是MySQL的一个分支，主要由开源社区在维护，采用GPL授权许可 MariaDB的目的是完全兼容MySQL，包括API和命令行，使之能轻松成为MySQL的代替品。在存储引擎方面，使用XtraDB（英语：XtraDB）来代替MySQL的InnoDB。 MariaDB由MySQL的创始人Michael Widenius（英语：Michael Widenius）主导开发，他早前曾以10亿美元的价格，将自己创建的公司MySQL AB卖给了SUN，此后，随着SUN被甲骨文收购，MySQL的所有权也落入Oracle的手中。MariaDB名称来自Michael Widenius的女儿Maria的名字。

MariaDB基于[事务][Link 1]的Maria[存储引擎][Link 2]，替换了[MySQL][]的[MyISAM][]存储引擎，它使用了Percona的 XtraDB，InnoDB的变体，分支的开发者希望提供访问即将到来的MySQL 5.4 InnoDB性能。这个版本还包括了 PrimeBase XT (PBXT) 和 FederatedX[存储引擎][Link 3]。

MariaDB直到5.5版本，均依照MySQL的版本。因此，使用MariaDB5.5的人会从MySQL 5.5中了解到MariaDB的所有功能。

从2012年11月12日起发布的10.0.0版开始，不再依照MySQL的版号。10.0.x版以5.5版为基础，加上移植自MySQL 5.6版的功能和自行开发的新功能。

![format_png][]

MariaDB虽然被视为MySQL数据库的替代品，但它在扩展功能、存储引擎以及一些新的功能改进方面都强过MySQL。而且从MySQL迁移到MariaDB也是非常简单的：

*  数据和表定义文件（.frm）与二进制兼容
 *  所有客户端API、协议和结构都完全一致
 *  所有文件名、二进制、路径、端口等都一致
 *  所有的MySQL连接器，比如PHP、Perl、Python、Java、.NET、MyODBC、Ruby以及MySQL C connector等在MariaDB中都保持不变
 *  mysql-client包在MariaDB服务器中也能够正常运行
 *  共享的客户端库与MySQL也与二进制兼容

也就是说，在大多数情况下，你完全可以卸载MySQL然后安装MariaDB，然后就可以像之前一样正常的运行。

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*  安装 Mariadb

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 1][]

*  ## 配置安全脚本 ##

安装完成后，root密码默认为空，因此需要进行配置安全控制程序。

在配置前需要先启动mariadb

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 2][]

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使用 mysql\_secure\_installation 启动安全配置程序，输入当前 root 密码，因为当前密码为空，直接回车

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 3][]

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是否设置 root 密码，这里输入 y 表示设置密码，输入2次密码，显示 success 为成功

![20200104093102364.png][]

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是否删除匿名用户，选择删除

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 4][]

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是否禁止 root 用户远程登录数据库，设置为是

![20200123073530649.png][]

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是否删除test数据库，这里为了后面测试选择不删除

![20200104093612982.png][]

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是否重载授权表，选择是

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 5][]

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配置完成，下面使用 mysql 命令登录数据库

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 6][]

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输入 help 可以得到帮助

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 7][]

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使用 show databases; 可以查看所有数据库

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 8][]

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使用 use 数据库名称; 进入数据库

![20200104094704808.png][]

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使用 show tables; 查看表列表

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 9][]

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使用 desc 表名称; 查看表结构

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 10][]

使用 select version(); 查看版本信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 11][]

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输入 quit 或者 exit 退出数据库，使用 mysqladmin -u root -p version 也可以查看版本信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 12][]

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数据库的日常操作不外乎增、改、删、查，下面我们一 一实践

*  **创建新数据库** 
 *   create database 数据库名称;
 *  指定默认字符 utf8
 *  create database DBNAME default charset 'utf8' collate 'utf8\_bin';

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 13][]

*  删除数据库
 *  drop database 数据库名称;

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 14][]

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*  **创建新用户**
 *  create user 'tom'@'localhost' identified by 'password';    'password' 为用户的口令
 *  （注：命令、参数不区分大小写，注意命令后面的分号  ; ）

![20200104100902866.png][]

*  **授权用户访问数据库**
 *  GRANT ALL PRIVILEGES ON mydata.\* to '用户名'@'localhost';  授权某一用户使用 mydata 数据库
 *  GRANT ALL PRIVILEGES ON \*.\* to '用户名'@'localhost';     \*.\*代表所有数据库
 *  grant select,insert,delete,update on mydata.\* to '用户名'@'localhost' identified by 'PASSWORD';  为用户授予部分权限

![2020010410253812.png][]

命令成功完成后需要刷新权限

![20200104105147149.png][]

*  删除用户
 *  Delete FROM mysql.user Where User='用户名' and Host='localhost';
 *  drop user '用户名'@'localhost'; 或者 drop user '用户名'@'%';   
 *  drop user ''@'localhost';

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 15][]

--------------------

*  **更改用户密码**
 *  use mysql;
 *  update user set password=PASSWORD("new\_password") where user="用户名";
 *  或者
 *  alter user '用户名'@'IP' IDENTIFIED BY 'PASSWORD';
 *  flush privileges;     修改完密码必须更新权限

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 16][]

*  **创建表格**
 *  use mydata;   选择在哪个数据库内创建
 *  create table mylist (  
    \-> id int not null,  
    \-> name varchar(30),  
    \-> primary key (id));　　该字段列值唯一，"primary key" 表示该列是表的主键, MySQL将自动索引该列

![20200104114423655.png][]

查看表格创建过程

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 17][]

在 mylist 表中插入一条信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 18][]

更改表名称

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 19][]

删除表内数据

![20200104115310593.png][]

更改表里的内容

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 20][]

增加表里的条目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 21][]

删除表里的条目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 22][]

更改表里的列名

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 23][]

更改列数据类型

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 24][]

*  **删除表格**
 *  DROP TABLE table\_name (删除表);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 25][]

*  **备份数据库**
 *  mysqldump -h主机名 -P端口 -u用户名 -p密码 --database 数据库名 > 文件名.sql
 *  mysqldump -u root -p --all-databases > /Your\_backup\_PWD/all\_dbs.sql    备份所有数据库

![20200105133308438.png][]

*  同时备份多个库
 *  mysqldump -h主机名 -P端口 -u用户名 -p密码 --databases 数据库名1 数据库名2 数据库名3 > 文件名.sql
 *  mysqldump -h192.168.10.2 -uroot -ppassword --databases mydata mysql > /Your\_backup\_PWD/db\_mydata\_mysql.sql

![20200105133729496.png][]

*  备份同个库多个表
 *  mysqldump -h主机名 -u用户名 -p密码 --database 数据库名 表1 表2 .... > 文件名.sql
 *  mysqldump -h192.168.10.2 -uroot -ppassword mydata mylist mylist1 > /Your\_backup\_PWD/mydata\_mylist\_mylist1.sql

![20200105133908695.png][]

*  备份数据库结构，不备份数据
 *  mysqldump --opt -d 数据库名 -u用户名 -p密码 > 文件名.sql     
 *   -d只导出结构             -t只导出数据
 *  mysqldump --opt -d mydata > /Your\_backup\_PWD/structure.sql

![20200105134706613.png][]

![20200105135013206.png][]

*  **恢复数据库**
 *  作为测试，在恢复之前先将原先的数据库删除
 *  mysql -uroot -p123456 -e "drop database mydata;"
 *  mysql -uroot -p123456 -e "show databases;"

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 26][]

*  恢复删除的数据库
 *  mysql -uroot -p123456 < /Your\_backup\_PWD/备份文件.sql

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 27][]

*  压缩备份
 *  mysqldump -uroot -p123456 -B mydata | gzip > /Your\_backup\_PWD/备份文件.sql.gz

![20200105140940652.png][]

*  **恢复压缩备份**
 *  gunzip < /Your\_backup\_PWD/备份文件.sql.gz | mysql -uroot -p123456

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 28][]

*  **开启mysqlbinlog 实现增量备份**
 *  编辑 /etc/my.cof 配置文件，增加一行 log-bin=/data/mysql-bin 指明bin-log存放路径，注意/data目录的权限为 mysql.mysql
 *  **二进制日志文件与数据库数据文件最好不要放在同一块硬盘上，如果存放数据文件的硬盘坏了，可以用另一块硬盘的二进制日志来恢复数据**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 29][]

![20200105153813515.png][]

重新启动mariadb 查看 /data 目录是否有bin-log文件

*  flush logs; 会多一个最新的bin-log日志
 *  show master status; 查看最后一个bin-log日志的相关信息
 *  reset master; 清空所有的bin-log日志

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 30][]

使用 mysqlbinlog 命令可以查看 bin-log 文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 31][]

*  **使用二进制日志还原数据库**
 *  mysqlbinlog /Your\_Bin-log\_DIR/mysql-bin.000001 | mysql -u root -p
 *  **这条命令可以理解为:使用mysqlbinlog读取二进制日志文件然后使用mysql命令还原到数据库中**
 *  **注意还原时必须是编号小的先还原**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 32][]

*  **删除二进制日志**
 *  **reset master； 删除所有**
 *  purge master logs to ‘mysql-bin.000004‘;   删除编号000004以前的所有
 *  purge master logs to ‘2019-10-1 12:00:00‘;   删除指定日期时间之前的所有

![20200105154037563.png][]

*  查看mysql服务器是否开启binlog日志，查看binlog文件存放位置与名称

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 33][]

*  开启binlog之后，备份数据 -A是所有库 -l 是锁库的意思，-F 是备份成功后刷新binlog日志的意思，即生成一份新binlog日志文件
 *  mysqldump -uroot -p123456 -A -l -F > /Your\_backup\_PWD/备份文件名称.sql

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 34][]

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*  **主从复制**
 *  主数据库所在服务器IP:192.168.10.2
 *  从数据库所在服务器IP:192.168.10.3
 *  mariadb的配置文件的位置：/etc/my.cnf

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首先在主数据库端编辑 /etc/my.cnf

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 35][]

*  \[mysqld\]
 *  log-bin=/data/mysql-bin                       \# binlog二进制日志存放位置
 *  server-id=1                                          \#主机标识ID号，不允许重复
 *  binlog-ignore-db=mysql                       \# 指明  igonre-db 忽略同步的库
 *  binlog-ignore-db=information\_schema
 *  binlog-ignore-db=performance\_schema
 *  binlog-ignore-db=test
 *  innodb\_flush\_log\_at\_trx\_commit=1
 *  binlog-do-db=database\_name             \#指明 do-db 需要同步的库
 *  replicate-do-db=database\_name         \#指明同步那些库
 *  **lower\_case\_table\_names=1               \#关闭大小写敏感**
 *  
 *  # **mysql8.0 需要初始化时设置** #
 *  **mysqld --user=mysql --lower-case-table-names=1 --initialize-insecure --datadir=/data/mysql**
 *  如果 /data/**mysql** 目录已经存在，需要手动删除
 *  
 *  **添加一个用户 (slave) 并授权，重启 Mariadb 服务，查看记录log-bin文件名和pos号**
 *  create user 'mycat'@'192.168.2.%' identified by 'MyCat@123456';
    
    grant all on \*.\* to 'mycat'@'192.168.2.%';
    
    select user,host,plugin,authentication\_string from mysql.user;
 *  
 *  grant replication slave on \*.\* to '授权用户名'@'%' identified by '授权用户密码';
 *  GRANT ALL PRIVILEGES ON \*.\* TO 'mycat'@'%' IDENTIFIED BY '123456';
 *  flush privileges;      刷新权限

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 36][]

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然后在从服务器配置 /etc/my.cnf

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 37][]

*  log-bin=/data/mysql/mysql-bin                             指明 bin-log 二进制文件存放位置
 *  server-id=2                                                            指明主机标识ID号，不允许重复
 *  relay-log-index=/data/mysql/slave-relay-bin.index      定义relay\_log的位置和名称
 *  relay-log=/data/mysql/slave-relay-bin

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重启从数据库服务后登陆进行以下操作

*  stop slave;      停止slave复制
 *  grant replication slave on \*.\* to '授权用户名'@'%' identified by '授权用户密码';
 *  change master to master\_host='主数据库IP地址',master\_user='授权用户名',master\_password='授权用户密码',master\_log\_file='主数据库BINLOG名称',master\_log\_pos=主数据库POS值;
 *  start slave;      开启slave复制
 *  show slave status\\G      查看同步状况

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 38][]

*  出现一个报错
 *  ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the MariaDB error log
 *  查看 mariadb error log
 *  tail /var/log/mariadb/mariadb.log
 *  \[ERROR\] Failed to open the relay log '/data/slave-log.000036' (relay\_log\_pos 4)
 *  reset slave all;     清空 slave log 信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 39][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 40][]

导入主数据库备份文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 41][]

在主数据库端添加一些数据，观测从数据库是否同步

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 42][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 43][]

*  ### **主主复制** ###
 *  首先在**主数据库**端编辑 /etc/my.cnf 添加以下内容
 *  log-bin=/data/master-log
 *  server-id=1
 *  relay-log=/data/slave-log
 *  auto\_increment\_offset=1            定义自增长字段开始数值
 *  auto\_increment\_increment=2     定义自增长字段每次递增的量值
 *  binlog\_format=mixed     \#混合模式复制(mixed-based replication, MBR)  
    log-slave-updates=1      \#控制是否把所有的操作写入到binary log，默认是关闭的
 *  max\_binlog\_size         = 100m              \#binlog每个日志文件大小  
    binlog\_cache\_size       = 4m                 \#binlog缓存大小  
    max\_binlog\_cache\_size   = 512m        \#最大binlog缓存大小

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 44][]

保存重启 mairadb 服务，登录后进行以下操作

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 45][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 46][]

*  然后在 **192.168.10.5 从**服务器端做以下操作
 *  vim /etc/my.cnf 添加以下内容
 *  log-bin=/data/master-log
 *  server-id=2
 *  relay-log=/data/slave-log
 *  auto\_increment\_offset=2
 *  auto\_increment\_increment=2
 *  binlog\_format=mixed     \#混合模式复制(mixed-based replication, MBR)  
    log-slave-updates=1      \#控制是否把所有的操作写入到binary log，默认是关闭的
 *  max\_binlog\_size         = 100m              \#binlog每个日志文件大小  
    binlog\_cache\_size       = 4m                 \#binlog缓存大小  
    max\_binlog\_cache\_size   = 512m        \#最大binlog缓存大小

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 47][]

保存重启 mairadb 服务，登录后进行以下操作

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 48][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 49][]

*  在2个服务器端分别添加、删除信息，验证同步是否正常
 *  在 10.2 上添加一条信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 50][]

*  在 10.5 端查看

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 51][]

*  在 10.5 端删除一些信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 52][]

*  在 10.2 端查看

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 53][]

*  ### **半同步复制** ###
 *  首先在主服务器端编辑 /etc/my.cnf 配置文件，添加以下内容
 *  `plugin-load=rpl_semi_sync_master=semisync_master.so   启用半同步插件`
 *  `rpl_semi_sync_master_enabled=1     启用半同步复制`
 *  ### **注：在某些高可用架构下，master和slave需同时启动，以便在切换后能继续使用半同步复制** ###
 *  即在主从数据库的my.cnf配置文件中都要添加:
 *  `plugin-load="``rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"`
    
    `rpl-semi-``sync``-master-enabled=1`
    
    `rpl-semi-``sync``-slave-enabled=1`

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 54][]

*  在从服务器端编辑 /etc/my.cnf 配置文件，添加以下内容
 *  `plugin-load=rpl_semi_sync_slave=semisync_slave.so`
 *  `rpl_semi_sync_slave_enabled=1`

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 55][]

*  **重启从数据库上的IO线程**
 *  STOP SLAVE IO\_THREAD;
 *  START SLAVE IO\_THREAD;
 *  **注: **如果没有重启**IO线程**，则默认的还是异步复制模式

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 56][]

*  在主服务器端查看插件是否启用

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 57][]

*  登录后查看半同步状态
 *  `show status like ``'Rpl_semi_sync_master_status';`

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 58][]

*  从数据库端查看
 *  `show status like ``'Rpl_semi_sync_slave_status'``;`

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 59][]

*  接着测试一下是否为半同步复制
 *  首先停止从数据库slave复制

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 60][]

*  在主数据库插入一些信息
 *  发现第一条信息用了10.03sec， 第二条Eric0.01sec，其实Mysql半同步复制并不是严格意义上的半同步复制。当半同步复制发生超时时（由rpl\_semi\_sync\_master\_timeout参数控制，单位是毫秒，默认为10000，即10s），会暂时关闭半同步复制，转而使用异步复制。当master dump线程发送完一个事务的所有事件之后，如果在rpl\_semi\_sync\_master\_timeout内，收到了从库的响应，则主从又重新恢复为半同步复制。**\[一旦有一次超时自动降级为异步\].**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 61][]

*  在从数据库打开 slave 复制

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 62][]

*  \[mysqld\]  
    datadir=/var/lib/mysql  
    socket=/var/lib/mysql/mysql.sock  
    log-bin=/data/mariadb/master-log  
    server-id=1  
    relay-log=/data/mariadb/slave-log  
    auto\_increment\_offset=1  
    auto\_increment\_increment=2  
    binlog\_format=mixed  
    log-slave-updates=1  
    max\_binlog\_size=100m  
    binlog\_cache\_size=4m  
    max\_binlog\_cache\_size=512m  
    binlog-ignore-db=mysql  
    innodb\_flush\_log\_at\_trx\_commit=1  
    plugin-load="rpl\_semi\_sync\_master=semisync\_master.so;rpl\_semi\_sync\_slave=semisync\_slave.so"  
    rpl-semi-sync-master-enabled=1  
    rpl-semi-sync-slave-enabled=1
 *  \[mysqld\]  
    datadir=/var/lib/mysql  
    socket=/var/lib/mysql/mysql.sock  
    log-bin=/data/mariadb/master-log  
    server-id=2  
    binlog\_format=mixed  
    log-slave-updates=1  
    relay-log=/data/mariadb/slave-log  
    auto\_increment\_offset=2  
    auto\_increment\_increment=2  
    max\_binlog\_size=100m  
    binlog\_cache\_size=4m  
    max\_binlog\_cache\_size=512m  
    binlog-ignore-db=mysql  
    innodb\_flush\_log\_at\_trx\_commit=1  
    plugin-load="rpl\_semi\_sync\_master=semisync\_master.so;rpl\_semi\_sync\_slave=semisync\_slave.so"  
    rpl-semi-sync-master-enabled=1  
    rpl-semi-sync-slave-enabled=1
 *  \[mysqld\]  
    datadir=/var/lib/mysql  
    socket=/var/lib/mysql/mysql.sock  
    log-bin=/data/mariadb/master-log  
    server-id=3  
    binlog\_format=mixed  
    log-slave-updates=1  
    relay-log=/data/mariadb/slave-log  
    auto\_increment\_offset=3                                                                                                                                                      
    auto\_increment\_increment=2  
    max\_binlog\_size=100m  
    binlog\_cache\_size=4m  
    max\_binlog\_cache\_size=512m  
    binlog-ignore-db=mysql  
    innodb\_flush\_log\_at\_trx\_commit=1  
    plugin-load="rpl\_semi\_sync\_master=semisync\_master.so;rpl\_semi\_sync\_slave=semisync\_slave.so"  
    rpl-semi-sync-master-enabled=1  
    rpl-semi-sync-slave-enabled=1

============================================================================================================

\# rm -rf /etc/my.cnf  
\# rm -rf /var/lib/mysql/\*  
\# chown -R  mysql.  /var/lib/mysql

--------------------

*  **忘记 mysql root 密码**
    
    1、编辑文件：vim /etc/my.cnf
    
    2、在 \[mysqld\] 字段下面，按i键编辑；添加skip-grant-tables；按esc键，输入:wq保存退出
    
    3、重启mysql:sudo service mysqld restart
    
    第二步免密码登录mysql
    
    1、登录：mysql -u root -p
    
    2、提示输入密码按回车进入
    
    3、进入数据库，输入：flush privileges;
    
    use mysql；
    
    4、查看root用户信息：select host,user,authentication\_string,plugin from user;
    
    5、更新root用户信息，把密码设置为空字符串：update user set authentication\_string='' where user='root';
    
    第三步、退出mysql；注释掉/etc/my.cnf文件最后的 skip-grant-tables ；重启：sudo service mysqld restart 或者 systemctl restart mysqld
    
    第四步：设置密码
    
    1、重新开启一个客户端；
    
    2、登录mysql(这时候还是不用输入密码，因为上面已经把密码设置为空字符串了);
    
    3、修改root用户密码:ALTER user 'root'@'%' IDENTIFIED BY 'root123\#\#ROOT';
    
    flush privileges;
    
    4、mysql8.0以上密码策略限制必须要大小写加数字特殊符号。退出mysql后就可以用密码登录了
    
    update user set host = "%" where user = "root";
    
    select user,host,authentication\_string from user;
    
    alter user 'root'@'%' IDENTIFIED BY 'MIMA';

--------------------

**\[root@****mysql1 ****~\]\# vim /etc/my.cnf**  
\[mysqld\]  
datadir=/var/lib/mysql  
socket=/var/lib/mysql/mysql.sock  
binlog-ignore-db=mysql  
log-bin=mysql-bin-master

character-set-client-handshake = FALSE  
character-set-server = utf8mb4  
collation-server = utf8mb4\_unicode\_ci  
init\_connect='SET NAMES utf8mb4'

server-id=12  
relay-log=slave-log  
binlog\_format= ROW  
auto\_increment\_offset=1  
auto\_increment\_increment=2  
log-slave-updates=1  
innodb\_flush\_log\_at\_trx\_commit=2

max\_binlog\_size = 100m   
max\_binlog\_cache\_size = 512m  
max\_connections = 3000  
max\_connect\_errors = 3000  
table\_open\_cache = 2048  
max\_allowed\_packet = 16M  
binlog\_cache\_size = 16M  
max\_heap\_table\_size = 16M  
tmp\_table\_size = 256M  
read\_buffer\_size = 1024M  
read\_rnd\_buffer\_size = 1024M  
sort\_buffer\_size = 1024M  
join\_buffer\_size = 1024M  
key\_buffer\_size = 8M  
thread\_cache\_size = 8  
query\_cache\_type = on  
query\_cache\_size = 512M  
query\_cache\_limit = 1024M  
ft\_min\_word\_len = 4  
long\_query\_time = 1   
symbolic-links=0  
log-error=/var/log/mysqld.log  
pid-file=/var/run/mysqld/mysqld.pid  
validate-password=OFF  
lower\_case\_table\_names=1  
\[mysql\]  
default-character-set = utf8mb4  
\[client\]  
default-character-set = utf8mb4

--------------------

**\[root@****mysql2** **~\]\# vim /etc/my.cnf**   
\[mysqld\]  
datadir=/var/lib/mysql  
socket=/var/lib/mysql/mysql.sock  
binlog-ignore-db=mysql  
log-bin=mysql-bin-master

character-set-client-handshake = FALSE  
character-set-server = utf8mb4  
collation-server = utf8mb4\_unicode\_ci  
init\_connect='SET NAMES utf8mb4'

server-id=13  
relay-log=slave-log  
binlog\_format= ROW  
auto\_increment\_offset=2  
auto\_increment\_increment=2  
log-slave-updates=1  
innodb\_flush\_log\_at\_trx\_commit=2

[Link 1]: https://baike.baidu.com/item/%E4%BA%8B%E5%8A%A1/5945882
[Link 2]: https://baike.baidu.com/item/%E5%AD%98%E5%82%A8%E5%BC%95%E6%93%8E/8969956
[MySQL]: https://baike.baidu.com/item/MySQL
[MyISAM]: https://baike.baidu.com/item/MyISAM
[Link 3]: https://baike.baidu.com/item/%E5%AD%98%E5%82%A8%E5%BC%95%E6%93%8E
[format_png]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zczMuYmRzdGF0aWMuY29tLzcwY0Z2OFNoX1ExWW54R2twb1dLMUhGNmhoeS9pdC91PTIyMTIyOTk5OTQsMjkzMDIwMjkzMyZmbT0yNiZncD0wLmpwZw?x-oss-process=image/format,png
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[20200104093102364.png]: https://img-blog.csdnimg.cn/20200104093102364.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200104093317485.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg=,size_16,color_FFFFFF,t_70
[20200123073530649.png]: https://img-blog.csdnimg.cn/20200123073530649.png
[20200104093612982.png]: https://img-blog.csdnimg.cn/20200104093612982.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200104093942169.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20200104094123359.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2dhb2ZlaTA0Mjg=,size_16,color_FFFFFF,t_70
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