Precautions for operation, maintenance and performance optimization of building web servers on CentOS

Operation, maintenance and performance optimization considerations for building a web server on CentOS

With the rapid development of the Internet, building your own web server has become an issue for more and more companies and individuals. needs. As a free and stable operating system, CentOS has become the first choice of many people. This article will introduce some operation and maintenance and performance optimization considerations when building a web server on CentOS, and provide some code examples.

1. Installing and Configuring Apache

First, we need to install Apache as our web server. In CentOS, you can use the following command to install:

yum install httpd

After the installation is complete, we need to do some configuration. Open Apache's main configuration file httpd.conf, usually located at /etc/httpd/conf/httpd.conf, and make the following settings:

• Modify ServerName, set the domain name or IP address of the server.
• ModifyDocumentRoot and set the root directory of the website.
• Configure a virtual host (if required) by adding the <VirtualHost> tag.

After the configuration is completed, use the following command to start Apache:

systemctl start httpd

2. Firewall settings

In order to protect the security of the server, we need to set firewall rules . CentOS uses firewalld to manage firewalls. The following are some commonly used commands:

• Check the firewall status:

  systemctl status firewalld

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• Turn on the firewall:

  systemctl start firewalld

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• Add allowed ports:

  firewall-cmd --permanent --add-port=80/tcp

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• Restart the firewall:

  firewall-cmd --reload

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##Install and configure MySQL

yum install mysql-server

systemctl start mysqld
systemctl enable mysqld

mysql_secure_installation

PHP Configuration

php-fpm for installation and configuration. The following are the installation steps:

• Install PHP and related extensions:

  yum install php php-fpm php-mysql

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Modify the
• php.ini file and find the date .timezone and set the time zone.
• Start php-fpm:

  systemctl start php-fpm
  systemctl enable php-fpm

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Performance optimization considerations

• Use HTTP caching to reduce server load. Caching can be enabled by adding the following configuration in

  httpd.conf:

  LoadModule cache_module modules/mod_cache.so
  <IfModule mod_cache.c>
  CacheEnable disk /
  </IfModule>

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• Compresses transmitted data to reduce network transmission time. You can add the following configuration in

  httpd.conf:

  LoadModule deflate_module modules/mod_deflate.so
  <IfModule mod_deflate.c>
  SetOutputFilter DEFLATE
  </IfModule>

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Reasonably configure the number of Apache processes and threads, and adjust them according to the actual situation.
Use the index of the database to speed up the query.
Use CDN (Content Delivery Network) to distribute server load and improve access speed.

Sample code

<?php
$servername = "localhost";
$username = "root";
$password = "your_password";
$dbname = "your_database";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT * FROM your_table";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();
?>

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