Centos install mysql

Installing MySQL on CentOS involves the following steps: Adding the appropriate MySQL yum source. Execute the yum install mysql-server command to install the MySQL server. Use the mysql_secure_installation command to make security settings, such as setting the root user password. Customize the MySQL configuration file as needed. Tune MySQL parameters and optimize databases for performance.

CentOS installation MySQL: more than just yum install

Many friends think that installing MySQL on CentOS, yum install mysql-server is done, Naive! This is just the tip of the iceberg, and the real challenge is understanding the mechanism behind the installation process and how to deal with the various problems that may arise. After reading this article, you can not only install MySQL, but also easily deal with various emergencies like an experienced driver.

Let’s talk about the basics first. CentOS uses yum to manage software packages. It is like a supermarket, and the MySQL installation package is inside. But "yum install" is just a simple command, behind which is a series of operations such as complex dependency processing, configuration file modification, service startup, etc. You thought you just installed a database, but in fact you built a running environment.

Let’s talk about yum source first. The default CentOS source may be older or the update is not timely. To get the latest version of MySQL, you may need to add additional sources, such as official MySQL sources or other reliable third-party sources. This step seems simple, but often errors occur, such as incorrectly writing the source address or inaccessible source server, which will cause installation failure. So, be sure to check the address carefully before adding a source, and it is best to try several more sources to avoid "place the eggs in the same basket".

Next is the installation process itself. After the command yum install mysql-server , the system will automatically download the dependency package, compile and install, and then start the MySQL service. Various problems may occur during this period, such as network connection problems causing download failure, or dependency package conflicts causing installation failure. Don't panic when encountering problems. Check the error log carefully. The log is usually located in /var/log/yum.log or MySQL log directory to find solutions based on the error information. Google is your best friend, so is Stack Overflow.

After the installation is completed, the root user password of MySQL is randomly generated by default. You need to use the mysql_secure_installation command to set the root user's password and complete other security settings, such as removing anonymous users, prohibiting remote root login, etc. This step is very important and is related to the security of the database. Don't ignore it! I have seen many examples of my friends getting hacked in the database because they did not set passwords. The lessons are profound!

Then, let's take a look at some advanced usages. Sometimes, you need to customize the MySQL configuration file, such as modifying the port number, character set, etc. The configuration file is usually located in /etc/my.cnf . You can edit it directly to modify the configuration, but be careful if you change a parameter wrong, MySQL may not be able to start. It is best to back up the configuration file before modifying. Moreover, after modification, remember to restart MySQL service before it can take effect.

Finally, let’s talk about performance optimization. The performance of MySQL is affected by many factors, such as hardware configuration, operating system parameters, database design, etc. Different optimization strategies are required for different application scenarios. For example, you can adjust MySQL cache parameters or use a suitable storage engine to improve the performance of the database. This part of the content is relatively complex and needs to be analyzed and adjusted according to actual conditions. Remember, performance optimization is a continuous process and not achieved overnight.

Here is a simple installation script for reference only. It needs to be modified according to the specific situation in actual applications:

 <code class="bash">#!/bin/bash # 添加MySQL官方yum源(请替换成合适的源地址) rpm -Uvh https://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm # 更新yum缓存yum update # 安装MySQL服务器yum install mysql-server # 安全设置mysql_secure_installation # 启动MySQL服务systemctl start mysqld # 设置开机启动systemctl enable mysqld # 检查MySQL服务状态systemctl status mysqld</code>

Remember, this is just a starter. The world of MySQL is very broad, and there are many advanced features and techniques waiting for you to explore. Only by continuing to learn and practice can you become a true MySQL master! Don't forget to read the official MySQL documentation carefully, that is your best learning material.

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