The correct way to install the php environment in centos7 is: 1. Execute the [yum install httpd] command to install apache; 2. Install the mysql database; 3. Execute the [yum install php php-server] command to install php.
The installation steps are as follows:
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1 , first install apache:
yum install httpd
Configure ServerName, enter the httpd.conf file:
vi /etc/httpd/conf/httpd.conf
Change #ServerName www.example.com:80 to ServerName localhost:80
Apache uses port 80 by default
Firewall opens port 80 for external access
firewall-cmd --permanent --zone=public --add-port=80/tcp //添加80端口 firewall-cmd --reload //生效
Check again whether it is enabled:
firewall-cmd --permanent --zone=public --list-ports //查看开放端口列表
Start apache:
systemctl start httpd.service
2. Install mysql:
yum install mysql mysql-server
Start mysql:
systemctl start mysqld.service
3. Install php
yum install php php-devel
Restart apache to make php take effect
systemctl restart httpd.service
At this time, you can go to the directory:/ Create a PHP file under var/www/html/
Code:
<?php phpinfo(); ?>
Access this file in the browser, you can see some information about PHP
Install php The extension
yum install php-mysql php-gd php-imap php-ldap php-odbc php-pear php-xml php-xmlrpc
After installing the extension, you need to restart apache again
systemctl restart httpd.service
The php code to test whether the mysql link is successful
<?php $servername = "localhost"; $username = "username"; $password = "password"; // 创建连接 $conn = new mysqli($servername, $username, $password); // 检测连接 if ($conn->connect_error) { die("连接失败: " . $conn->connect_error); } echo "连接成功"; ?>
You can pass the above code into the directory /var/ www/html/
Access this file in the browser. If the output connection is successful, the configuration is OK.
Attachment: Apache default configuration file path:
The root directory of the website points to the /var/www/html directory
The main configuration file is /etc/httpd/conf/httpd .conf
is stored in the /etc/httpd/conf.d/ directory
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CentOS is an open source distribution based on RedHatEnterpriseLinux, focusing on stability and long-term support, suitable for a variety of server environments. 1. The design philosophy of CentOS is stable and suitable for web, database and application servers. 2. Use YUM as the package manager to release security updates regularly. 3. Simple installation, you can build a web server with a few commands. 4. Advanced features include enhanced security using SELinux. 5. Frequently asked questions such as network configuration and software dependencies can be debugged through nmcli and yumdeplist commands. 6. Performance optimization suggestions include tuning kernel parameters and using a lightweight web server.

CentOS is widely used in server management and web hosting. Specific methods include: 1) using yum and systemctl to manage the server, 2) install and configure Nginx for web hosting, 3) use top and mpstat to optimize performance, 4) correctly configure the firewall and manage disk space to avoid common problems.

CentOS is a stable, enterprise-grade Linux distribution suitable for server and enterprise environments. 1) It is based on RedHatEnterpriseLinux and provides a free, open source and compatible operating system. 2) CentOS uses the Yum package management system to simplify software installation and updates. 3) Support advanced automation management, such as using Ansible. 4) Common errors include package dependency and service startup issues, which can be solved through log files. 5) Performance optimization suggestions include the use of lightweight software, regular cleaning of the system and optimization of kernel parameters.

Alternatives to CentOS include RockyLinux, AlmaLinux, OracleLinux, and SLES. 1) RockyLinux and AlmaLinux provide RHEL-compatible binary packages and long-term support. 2) OracleLinux provides enterprise-level support and Ksplice technology. 3) SLES provides long-term support and stability, but commercial licensing may increase costs.

Alternatives to CentOS include UbuntuServer, Debian, Fedora, RockyLinux, and AlmaLinux. 1) UbuntuServer is suitable for basic operations, such as updating software packages and configuring the network. 2) Debian is suitable for advanced usage, such as using LXC to manage containers. 3) RockyLinux can optimize performance by adjusting kernel parameters.

The CentOS shutdown command is shutdown, and the syntax is shutdown [Options] Time [Information]. Options include: -h Stop the system immediately; -P Turn off the power after shutdown; -r restart; -t Waiting time. Times can be specified as immediate (now), minutes ( minutes), or a specific time (hh:mm). Added information can be displayed in system messages.

The key differences between CentOS and Ubuntu are: origin (CentOS originates from Red Hat, for enterprises; Ubuntu originates from Debian, for individuals), package management (CentOS uses yum, focusing on stability; Ubuntu uses apt, for high update frequency), support cycle (CentOS provides 10 years of support, Ubuntu provides 5 years of LTS support), community support (CentOS focuses on stability, Ubuntu provides a wide range of tutorials and documents), uses (CentOS is biased towards servers, Ubuntu is suitable for servers and desktops), other differences include installation simplicity (CentOS is thin)

Steps to configure IP address in CentOS: View the current network configuration: ip addr Edit the network configuration file: sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0 Change IP address: Edit IPADDR= Line changes the subnet mask and gateway (optional): Edit NETMASK= and GATEWAY= Lines Restart the network service: sudo systemctl restart network verification IP address: ip addr


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