更换mysql数据目录后出现ERROR 2002 (HY000): Can't connect to_MySQL
bitsCN.com
服务器上的mysql默认数据目录为/var/lib/mysql/,同时服务器的/空间不是很大,而近期又有大量的日志需要导入进行分析,时常搞得/的空间捉襟见肘,晚上一狠心就想把mysql的数据目录转移到另外一块硬盘/data中。
于是关闭mysql服务:
service mysqld stop
转移mysql数据目录
mv /var/lib/mysql/ /data/
编辑my.cnf
vi /etc/my.cnf
修改其中的datadir和socket到新的路径
[mysqld]
datadir=/data/fuhj/mysql
socket=/data/fuhj/mysql/mysql.sock
本以为修改完启动mysql服务之后就没问题了。
service mysqld start
但是尽管启动服务没有问题,但是通过mysql客户端连接的时候却报错:
[root@hostXXX data]# mysql -u root -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
在网上搜了半天也没个所以然,一个个都是相互抄袭,各种拷贝,没有一个靠谱的。
自己分析了一下,提示说无法通过socket文件/var/lib/mysql/mysql.sock连接到mysql服务器,也就是说对于mysql程序来说,尽管我把socket文件从/var/lib/mysql/mysql.sock转移到了/data/mysql/mysql.sock我在my.cnf里指定了mysqld知道了,但是对于mysql还是会从默认的安装目录/var/lib/mysql/里找这个mysql.sock文件,找不着,就不知道从哪里启动了。
为了验证我的想法,我首先从转移后的路径做了个软连接指向到mysql的默认目录里,如果mysql程序能连上说明想法是正确的。
ln –s /data/mysql/mysql.sock /var/lib/mysql/
做完软连接,重启mysql服务,再次通过mysql程序连接,没有问题,可以连上了。
[root@host160 lib]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or /g.
Your MySQL connection id is 3
Server version: 5.1.71 Source distribution
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.
mysql>
那说明就是这里的问题了。
其实不做软链接也是可以的,只需要在/etc/my.cnf里添加[mysql]字段指定socket的位置到我们转移后的位置即可
[mysql]
socket=/data/mysql/mysql.sock
作者: 付海军
出处:http://fuhj02.cnblogs.com
版权:本文版权归作者和博客园共有
转载:欢迎转载,为了保存作者的创作热情,请按要求【转载】,谢谢
要求:未经作者同意,必须保留此段声明;必须在文章中给出原文连接;否则必究法律责任
个人网站: http://www.fuhaijun.com/

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











Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.

Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.

When developing an e-commerce website using Thelia, I encountered a tricky problem: MySQL mode is not set properly, causing some features to not function properly. After some exploration, I found a module called TheliaMySQLModesChecker, which is able to automatically fix the MySQL pattern required by Thelia, completely solving my troubles.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.
