Database
Mysql Tutorial
The reason why mysql database cannot be connected remotely under Centos7 and the detailed solution
The reason why mysql database cannot be connected remotely under Centos7 and the detailed solution
MySQL is an open source SQL database management system developed by Oracle. The following article mainly introduces to you the reasons and solutions for the inability to remotely connect to the mysql database under Centos7. The article introduces it in detail through sample code. You need to Friends can refer to it, let’s take a look below.
Preface
I recently encountered a problem at work. I found that I couldn’t connect to mysql remotely under the Centos7 system. By searching for the relevant Information, it was finally solved. The following method was the method I tried after encountering the problem of being unable to connect to the Mysql database remotely, and finally solved the problem. So I’ll summarize and share it for the reference of friends who also encounter this problem. I won’t say much below, let’s take a look at the detailed introduction.
There are two reasons
The database is not authorized
The server firewall does not open port 3306
1. The database is not authorized
There is no authorization for the mysql database, just use one command.
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION; //远程连接数据库的时候需要输入用户名和密码 用户名：root 密码:123456 指点ip:%代表所有Ip,此处也可以输入Ip来指定Ip 输入后使修改生效还需要下面的语句 mysql>FLUSH PRIVILEGES;
2. The server firewall does not open port 3306
centos has two firewalls: FirewallD and iptables Firewall
centos7 uses FirewallD firewall.
FirewallD is a front-end controller for iptables that implements persistent network traffic rules. It provides command line and graphical interfaces and is available in the repositories of most Linux distributions. Compared with directly controlling iptables, there are two main differences in using FirewallD:
1. FirewallD uses zones and services instead of chain rules.
2. It dynamically manages the rule set, allowing rules to be updated without destroying existing sessions and connections.
FirewallD is a wrapper around iptables that allows you to manage iptables rules more easily - it is not a replacement for iptables. Although iptables commands can still be used with FirewallD, it is recommended that only FirewallD commands be used when using FirewallD.
1. FirewallD firewall opens port 3306
firewall-cmd --zone=public --add-port=3306/tcp --permanent
Command meaning:
--zone #作用域 --add-port=3306/tcp #添加端口，格式为：端口/通讯协议 --permanent #永久生效，没有此参数重启后失效
Restart the firewall
systemctl restart firewalld.service
2.iptables development 3306 port
/sbin/iptables -I INPUT -p tcp -dport 3306 -j ACCEPT /etc/rc.d/init.d/iptables save
Summary
The above is the detailed content of The reason why mysql database cannot be connected remotely under Centos7 and the detailed solution. For more information, please follow other related articles on the PHP Chinese website!
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
1664
14
1422
52
1316
25
1267
29
1239
24
MySQL and phpMyAdmin: Core Features and Functions
Apr 22, 2025 am 12:12 AM
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.
MySQL vs. Other Programming Languages: A Comparison
Apr 19, 2025 am 12:22 AM
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.
Oracle's Role in the Business World
Apr 23, 2025 am 12:01 AM
Oracle is not only a database company, but also a leader in cloud computing and ERP systems. 1. Oracle provides comprehensive solutions from database to cloud services and ERP systems. 2. OracleCloud challenges AWS and Azure, providing IaaS, PaaS and SaaS services. 3. Oracle's ERP systems such as E-BusinessSuite and FusionApplications help enterprises optimize operations.
Explain the purpose of foreign keys in MySQL.
Apr 25, 2025 am 12:17 AM
In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.
Compare and contrast MySQL and MariaDB.
Apr 26, 2025 am 12:08 AM
The main difference between MySQL and MariaDB is performance, functionality and license: 1. MySQL is developed by Oracle, and MariaDB is its fork. 2. MariaDB may perform better in high load environments. 3.MariaDB provides more storage engines and functions. 4.MySQL adopts a dual license, and MariaDB is completely open source. The existing infrastructure, performance requirements, functional requirements and license costs should be taken into account when choosing.
SQL vs. MySQL: Clarifying the Relationship Between the Two
Apr 24, 2025 am 12:02 AM
SQL is a standard language for managing relational databases, while MySQL is a database management system that uses SQL. SQL defines ways to interact with a database, including CRUD operations, while MySQL implements the SQL standard and provides additional features such as stored procedures and triggers.
How to safely store JavaScript objects containing functions and regular expressions to a database and restore?
Apr 19, 2025 pm 11:09 PM
Safely handle functions and regular expressions in JSON In front-end development, JavaScript is often required...
Redis: Understanding Its Architecture and Purpose
Apr 26, 2025 am 12:11 AM
Redis is a memory data structure storage system, mainly used as a database, cache and message broker. Its core features include single-threaded model, I/O multiplexing, persistence mechanism, replication and clustering functions. Redis is commonly used in practical applications for caching, session storage, and message queues. It can significantly improve its performance by selecting the right data structure, using pipelines and transactions, and monitoring and tuning.
