MySQL 安装与主从配置
我是ssh远程 配置的;略微有些不同,大家自己斟酌。1.安装MySQLsudo yum install mysql mysql-server sudo chgrp -R mysql /var/
我是ssh远程 配置的;略微有些不同,大家自己斟酌。
1.安装MySQL
sudo yum install mysql mysql-server
sudo chgrp -R mysql /var/lib/mysql
sudo chmod -R 770 /var/lib/mysql
sudo service mysqld start
第一次安装设置密码:mysql_secure_installation
回车,根据提示输入Y
输入2次密码,回车
根据提示一路输入Y
最后出现:Thanks for using MySQL!
2.创建一个新的用户test在MySQL上
mysql>grant all privileges on mysql .* to test@192.168.100.206 identified by 'mysql';
这里顺便提下取消授权的命令 为revoke 再将语句中的to 换为from 达到撤销已赋权限的目的
删除用户的命令为
drop user 用户名@‘%’
以下内容为在MySQL上建立的一个test的数据库操作的
3.MySQL主从配置
grant all on *.* to user1@192.168.100.205 identified by "mysql";
192.168.100.205 slave(从服务器)的IP
MySQL从服务器上登陆MySQL主服务器
sudo mysql -uuser1 -pmysql -h192.168.100.206
4.主服务器my.cnf配置
[mysqld]
server-id=1
log-slow-queries=mysql-slow.log
log-error=mysql.err
log=mysql.log
log-bin=mysql-bin
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
从服务器my.cnf配置
[mysqld]
port=3306
server-id=2
expire_logs_day=7
log-slow-queries=mysql-slow.log
log-error=mysql.err
log=mysql.log
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
#character-set-server = utf8
#collation-server =utf8_general_ci 此行和上一行为改变编码为UTF8 ,
#如果要改的话一定要注意所有的编码都要改
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
5.mysql服务器备份(主服务器)
#mysqldump -uroot -pmysql test -l -F '/tmp/test.sql'
此命令备份不用另外读锁
-F即flush logs
-l 表示数据库只能进行读的操作
Tips:可以通过binlog日志恢复 ,还有flush logs 的作用很重要,也可以说flush作用很大
进行操作完成前最好刷新下日志。
6.MySQL的恢复:
mysql -uroot -pmysql test -v -f-v 查看导入的详细信息;
-f 是当中间遇到错误时可以skip,,继续执行下面的语句
恢复binlog-file的二进制日志文件
mysqlbinlog --no-defaults binlog-file |mysql -uroot -pmysql
但是很多时候binlog日志里面有些操作需要丢弃;
那就要使用不同的命令来满足需求了:
#mysqlbinlog --no-defaults mysqk-bin.000004 --start-position="193"--stop-position="280"|more
恢复position位置为193-280的数据。
从第一次开始恢复可以去掉--start-position
也可以通过时间点来恢复
如:--stop-date="xxxx-xx-xx xx:xx:xx'
--start-date="xxxx-xx-xx xx:xx:xx'
6.将主服务器上备份的文件复制到从服务器tmp下
scp /tmp/test.sql 192.168.100.205:/tmp/
然后在从服务器上进行恢复,恢复之前最好先Reset master;
mysql -uroot -pmysql test
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.100.206
Master_User: user1
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000004
Read_Master_Log_Pos: 262
Relay_Log_File: mysqld-relay-bin.000006
Relay_Log_Pos: 407
Relay_Master_Log_File: mysql-bin.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes #这两行YES代表成功了
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 262
Relay_Log_Space: 708
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)
以下为用到的一些命令及笔记
mysql> insert into t1 values(4),(5),(6),(7),(8);插入

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











Apple's latest releases of iOS18, iPadOS18 and macOS Sequoia systems have added an important feature to the Photos application, designed to help users easily recover photos and videos lost or damaged due to various reasons. The new feature introduces an album called "Recovered" in the Tools section of the Photos app that will automatically appear when a user has pictures or videos on their device that are not part of their photo library. The emergence of the "Recovered" album provides a solution for photos and videos lost due to database corruption, the camera application not saving to the photo library correctly, or a third-party application managing the photo library. Users only need a few simple steps

Hibernate polymorphic mapping can map inherited classes to the database and provides the following mapping types: joined-subclass: Create a separate table for the subclass, including all columns of the parent class. table-per-class: Create a separate table for subclasses, containing only subclass-specific columns. union-subclass: similar to joined-subclass, but the parent class table unions all subclass columns.

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())

To handle database connection errors in PHP, you can use the following steps: Use mysqli_connect_errno() to obtain the error code. Use mysqli_connect_error() to get the error message. By capturing and logging these error messages, database connection issues can be easily identified and resolved, ensuring the smooth running of your application.

Using the database callback function in Golang can achieve: executing custom code after the specified database operation is completed. Add custom behavior through separate functions without writing additional code. Callback functions are available for insert, update, delete, and query operations. You must use the sql.Exec, sql.QueryRow, or sql.Query function to use the callback function.

Through the Go standard library database/sql package, you can connect to remote databases such as MySQL, PostgreSQL or SQLite: create a connection string containing database connection information. Use the sql.Open() function to open a database connection. Perform database operations such as SQL queries and insert operations. Use defer to close the database connection to release resources.

JSON data can be saved into a MySQL database by using the gjson library or the json.Unmarshal function. The gjson library provides convenience methods to parse JSON fields, and the json.Unmarshal function requires a target type pointer to unmarshal JSON data. Both methods require preparing SQL statements and performing insert operations to persist the data into the database.

Use the DataAccessObjects (DAO) library in C++ to connect and operate the database, including establishing database connections, executing SQL queries, inserting new records and updating existing records. The specific steps are: 1. Include necessary library statements; 2. Open the database file; 3. Create a Recordset object to execute SQL queries or manipulate data; 4. Traverse the results or update records according to specific needs.
