CentOSApache
1.安装Apache
在终端中输入下面的命令就可以安装Apache了:
sudo yum install httpd
sudo的意思是用root用户做什么操作。要点击y就确认下载安装了,非常方便。
然后用下面的命令来启动服务
sudo service httpd start
现在不用着急往下弄,直接在浏览器中输入DigitalOcean给你的IP地址,应该就可以访问到Apache的欢迎页面了。类似下面的样子:
是不是很酷?如果你的域名已经成功解析到你主机的IP地址上的话,用你的域名应该也可以访问了!
2.安装Mysql
sudo yum install mysql-serversudo service mysqld start
用上面的命令就可以下载安装mysql了,第二条是启动mysql服务的意思。
安装mysql会询问你一些简单的配置,先按enter,后面的其实英文很简单,根据自己的需求来选。
Disallow root login remotely?有这样一条选项,是否允许mysql 的root用户远程访问,我是选择了no,可以访问,这样方便些,但存在安全隐患。这样后面做软件也可以使用这个VPS中的数据库了。
3.安装PHP以及PHP组件
sudo yum install php php-mysql
用上面这个命令就可以下载安装PHP了。比较麻烦的是PHP的组件。
yum install php-gd php-imap php-ldap php-odbc php-pear php-xmlphp-xmlrpc
我这里简单的安装了7个组件,你也可以搜索所有的PHP组件,用下面的命令
yum search php-
4.开机默认启动Apache和Mysql服务
sudo chkconfig httpd onsudo chkconfig mysqld on
可以用上面两个命令来选择开机启动Apache和Mysql.
5.测试PHP是否安装成功
sudo nano /var/www/html/info.php
你可以用上面的命令来新建一个info.php文件,nano是简单的文本编辑工具,还有vim。
输入简单的测试PHP命令:
<?phpphpinfo ();?>
然后输入Ctrl o进行保存,点击回车确认。再输入Ctrl x进行退出。
然后在浏览器中,输入IP地址加上info.php,就可以看到PHP的信息了!类似下面的图:
只差安装Wordpress了,好兴奋。

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

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.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

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.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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