Cloud server

Various server solutions: web server; email server; DNS server; database server

Web server backup

The purpose of network server backup is to ensure that when the server or network fails, the system can still maintain high availability and uninterrupted services to avoid a single point of failure (Single Point of Failure). Failure, SPOF). Redundancy can improve the reliability, fault tolerance and stability of the system, which is especially important for systems that provide critical services.

1. Hardware layer redundancy

The redundancy at the hardware layer mainly uses redundant hardware to prevent system downtime caused by a single hardware failure. Common hardware redundancy technologies include:

• RAID（Redundant Array of Independent Disks）: Provide data backup through a combination of multiple hard drives. When one of the hard drives is damaged, the data can still be recovered from the other hard drives. Common RAID Tiers include RAID 1 (mirror), RAID 5 (distributed parity), and more.
• Redundant power supply: The server is equipped with multiple power modules. If one power supply fails, other power modules can take over and keep the server running.
• Network Interface Card (NIC) Redundancy: Configure multiple network interface cards (NICs). Once one of the interface cards fails, traffic will automatically switch to other available network cards to ensure network connectivity.
• Failover Servers: Set up a backup server to cope with main server failure. When the main server fails to operate, the backup server automatically takes over the traffic.

2. Load Balancing

Load balancing is the process of spreading incoming traffic across multiple servers to prevent one server from being overloaded and improve overall system availability. Load balancing can often be combined with redundancy to achieve automatic failover. Common load balancing techniques include:

• DNS load balancing: Allocate user requests to different servers based on different geographical locations or server status.
• Hardware load balancer: Hardware devices such as F5 and Cisco dynamically distribute requests to multiple back-end servers based on traffic conditions.
• Software load balancer: For example, HAProxy, Nginx, etc. can be used as software load balancers to distribute traffic, and also provide health check and failover functions.

3. Failover

Failover means that when the main server or device fails, it automatically switches to a backup system to ensure system continuity. Failover can occur at multiple levels, including the application layer, server layer, and network layer.

• Active-Passive mode: There is usually a primary server that handles all requests, and a backup server that takes over traffic if the primary server fails.
• Master/Master mode (Active-Active): Multiple servers handle requests at the same time. When one of the servers fails, its traffic is automatically transferred to other available servers.
• IP failover (VRRP and CARP): IP redundancy is achieved through Virtual Router Redundancy Protocol (VRRP) or Common Address Resolution Protocol (CARP). These protocols allow multiple servers to share the same virtual IP address, when the primary server fails, the virtual IP is automatically transferred to the backup server.

4. Data backup and data synchronization

Data backup ensures that when a system failure occurs, data will not be lost and can be quickly restored. Common data backup methods include:

• backup: Make complete backups of data regularly and store them in different locations, such as off-site backup or cloud storage. This way, even if the server fails or the data is corrupted, the data can still be restored from the backup.
• Data synchronization: Technologies such as MySQL master-slave replication and MongoDB replica sets keep data synchronized between multiple servers. When the main server fails, the backup server can quickly take over and ensure data consistency.

5. Geo-Redundancy

Geographical redundancy is to deploy servers in different geographical locations to cope with system interruptions caused by regional disasters (such as earthquakes, fires, etc.). This strategy ensures that even if one data center fails, data centers in other regions can still provide services.

• Offsite data center: Distribute servers and data across data centers in different regions and use technology such as DNS load balancing or CDN to achieve high availability around the world.

6. High Availability Clusters

High availability clusters (HA Clusters) are a group of servers working together to ensure continuous operation and automatic failover of applications. When one of the servers fails, the other servers take over. Common high-availability clustering technologies include:

• Pacemaker: An open source high-availability resource management tool often used with Corosync.
• Kubernetes: An open source platform for container orchestration, with a built-in high availability mechanism that ensures service redundancy and failover.

7. Cloud backup

Utilizing the cloud service provider's backup mechanism can effectively reduce the burden of server management. Most cloud service providers (such as AWS, Google Cloud, Microsoft Azure) offer features such as automatic failover, load balancing, and data redundancy.

• Cloud load balancing: Such as AWS's Elastic Load Balancing, which can automatically distribute traffic to multiple EC2 instances and provide automatic failover.
• Multi-region deployment: Deploy applications and data in multiple geographical areas, and when service in one area is interrupted, traffic can be automatically switched to other areas.

Summarize

Network server redundancy is a multi-level strategy, involving redundancy mechanisms at the hardware, network, data, and application levels. Depending on the system’s needs and budget, you can choose the appropriate backup technology

Apache HTTP Server

What is Apache HTTP Server?

Apache HTTP Server (often referred to as Apache or httpd) is an open source web server software developed and maintained by the Apache Software Foundation. It is widely used for website hosting and supports the publishing of various web content and applications.

Main features of Apache HTTP Server

• Dynamic content support:Apache can support languages ​​such as PHP, Python, and Perl through modules to generate dynamic web content.
• Modular design:Apache provides a variety of modules to add functions according to needs, such as SSL/TLS encryption, URL rewriting, caching, etc.
• Virtual host support:Supports multiple websites running on the same server, with virtual hosting settings through IP or domain name.
• Security:Provides multi-layer security protection functions, including credential management, access control and firewall configuration.

Advantages of Apache HTTP Server

Apache HTTP Server has the following main advantages:

1. Free and open source:Not only is it free, but it also has an active community and rich resource support.
2. Cross-platform support:Supports multiple operating systems such as Windows, Linux, macOS, etc.
3. Highly customizable:Users can install or configure different modules according to their needs to flexibly adjust functions.
4. Stability and reliability:Apache has many years of development history, and its stability and reliability are trusted by the industry.

Scenarios suitable for using Apache HTTP Server

Apache HTTP Server is suitable for the following scenarios:

• A reliable web server is required to host static or dynamic content.
• Businesses and developers require servers with a high degree of customization.
• An environment where multiple websites need to be run on a single server.

Apache HTTP Server logs

Default log file path

• Linux: /var/log/apache2/or/var/log/httpd/
• Windows: logs/The folder is usually within the Apache installation directory

Main log file types

• access.log: Record all HTTP requests from the client
• error.log: Record error messages, start/stop and other server events

access.log format example (Common Log Format)

127.0.0.1 - frank [10/Jul/2025:13:55:36 +0800] "GET /index.html HTTP/1.1" 200 2326

• 127.0.0.1:Guest IP
• frank: authenticated user
• [10/Jul/2025:13:55:36 +0800]: Request time
• "GET /index.html HTTP/1.1":Request method and path
• 200:HTTP response status code
• 2326: Return data size (byte)

error.log format example

[Fri Jul 05 13:55:36.123456 2025] [core:error] [pid 12345] [client 127.0.0.1:54321] AH00123: File does not exist: /var/www/html/favicon.ico

• date time
• Module name and error level (e.g.[core:error]）
• PID and source IP
• Error message content

Modify record location and format

Available in the Apache configuration filehttpd.conforsites-available/*.confMedium setting:

ErrorLog "/var/log/apache2/error.log"
CustomLog "/var/log/apache2/access.log" combined

Analysis tools

• GoAccess: Real-time web interface analysis
• AWStats: Detailed reporting tool
• Webalizer: Quick graphical reporting

error.log file

Use logrotate to binning

On Linux systems, it is recommended to uselogrotateTool to regularly split and compress Apache log files and automatically retain historical records.

Setting example

generally/etc/logrotate.d/apache2or/etc/logrotate.d/httpdIs Apache’s logrotate configuration file:

/var/log/apache2/*.log {
    daily
    missingok
    rotate 7
    compress
    delaycompress
    notifempty
    create 640 root adm
    sharedscripts
    postrotate
        if systemctl status apache2 > /dev/null ; then \
            systemctl reload apache2 > /dev/null; \
        fi
    endscript
}

• daily: Divide once a day
• rotate 7: Keep 7 old files
• compress: Use gzip to compress old files
• notifempty: If log is empty, it will not be processed.
• postrotate:Reload Apache after log splitting

Manual cutting log (not recommended for long-term use)

mv /var/log/apache2/error.log /var/log/apache2/error.log.old
systemctl reload apache2

This method needs to ensure that Apache will regenerate new files after reloading.

Windows system processing method

• Use Apache-supportedrotatelogs.exetool
• Modify httpd.conf inErrorLogThe instructions are as follows:

ErrorLog "|bin/rotatelogs.exe logs/error-%Y-%m-%d.log 86400"

This setting will generate an error log every day.

suggestion

• Use logrotate or rotatelogs for binning
• Clean old logs regularly
• Check if there are a large number of errors in repeated writing, the application may need to be corrected

error.log format

Basic concepts

error.logThe format cannot be likeaccess.logthrough thatLogFormatThe directive is customizable, but can be adjusted by adjusting Apache'sLogLevelwith enablingmod_log_debugModule to control output content and detail.

Common error message formats

[Fri Jul 05 14:20:30.123456 2025] [core:error] [pid 12345] [client 192.168.0.1:54321] AH00123: File does not exist: /var/www/html/favicon.ico

You cannot directly change the formatting order or content template, but you can control the type and level of detail that appears.

Set error level

AvailableLogLevelAdjust record detail:

LogLevel warn

The levels are in order (from most to least):trace8、...、trace1、debug、info、notice、warn、error、crit、alert、emerg

Detailed settings for the module

LogLevel core:info rewrite:trace3 ssl:warn

Use mod_log_debug to increase debugging output

If enabledmod_log_debugmodule, which can be passed throughDebugLogandDebugLevelLog custom error messages:

DebugLog /var/log/apache2/debug.log
DebugLevel 2

Advanced method: rewrite the output format

If you really need to customize the error log format, you can consider:

• Use insteadCustom external log management tools(such as rsyslog or journald with regular expressions)
• matchLogPipePass the output to a custom program for processing

summary

• The format of Apache error log is a fixed template and is not supported.LogFormat
• AvailableLogLevelControl display content
• AvailablerotatelogsChange the log file name style and splitting method
• For advanced processing, it is recommended to export the log to other systems (such as ELK, rsyslog) and then format it.

Apache HTTP Server supports PHP

Basic concepts

Apache itself does not directly execute PHP. It needs to use PHP modules or external processing methods to parse the PHP code and return the results.

Integration method

• mod_php(Apache module approach)

  By loading PHP modules directly into Apache, PHP code can be processed directly by Apache.

• FastCGI / PHP-FPM

  Apache throughmod_fcgidormod_proxy_fcgiHandle PHP requests to PHP-FPM for better performance and compatibility.

Common platform suites

• XAMPP（Windows / Linux / macOS）
• WAMP（Windows）
• MAMP（macOS / Windows）
• LAMP（Linux: Apache + MySQL/MariaDB + PHP）

Linux sample settings (PHP-FPM, recommended usage for newer versions)

    ServerName example.com
    DocumentRoot /var/www/html

    
        SetHandler "proxy:unix:/run/php/php8.2-fpm.sock|fcgi://localhost/"
    

Windows example setup (manual installation of PHP modules)

Download the Windows version of PHP and make sure Apache is compatible with the PHP version. Apache 2.4 is often used with PHP 7.xphp7apache2_4.dllMods.

# Load PHP module
LoadModule php7_module "C:/php/php7apache2_4.dll"

#Specify PHP installation directory
PHPIniDir "C:/php"

# Support PHP extension
AddHandler application/x-httpd-php .php

Example: If Apache is installed onC:/Apache24/, PHP is installed onC:/php/,make surephp7apache2_4.dllExists in the PHP directory.

Windows example setup (XAMPP method)

XAMPP is an integrated package with built-in Apache + MariaDB + PHP + Perl, suitable for Windows users to quickly build.

1. Download and installXAMPP
2. Start XAMPP Control Panel and clickStartApache and MySQL
3. existC:/xampp/htdocs/Establishinfo.php
4. The content is as follows:

<?php
phpinfo();
?>

Open the browser and enterhttp://localhost/info.php, if the PHP information page is displayed, it means success.

suggestion

• XAMPP/WAMP is available for native testing on Windows platforms, eliminating the hassle of manual integration.
• For the official server environment, Linux + Apache + PHP-FPM is recommended for better performance and security.

Web server periodically executes PHP

Using crontab (Linux systems)

In a Linux environment, PHP scripts can be executed regularly via crontab schedule.

1. Open the crontab editor:
   crontab -e

2. Add a schedule, for example, execute it every 5 minutes:
   */5 * * * * /usr/bin/php /var/www/html/script.php

Note: Make sure the path is correct. Both PHP executable files and scripts need execution permissions.

Use the Windows Work Scheduler

If the server is Windows, PHP can be executed regularly through the "Job Scheduler".

1. Open the "Work Scheduler" and add basic tasks.
2. Set trigger time and frequency.
3. Set the action to execute the program and fill in:
   Program: Full path to php.exe
   Parameter: Full path to PHP script, for example C:\xampp\htdocs\script.php

Simulate schedule through browser

If the scheduling tool cannot be used, it can also be triggered indirectly through the following methods:

• Use JavaScript to send regular requests to PHP (valid only when the user opens the web page).
• Use external services such as EasyCron, cron-job.org, etc. to regularly access URLs.

Things to note when writing PHP scripts

• Avoid outputting HTML except for web page display.
• Execution records can be written to files or databases for query.
• Add error handling and exception monitoring mechanisms to ensure stable operation.

Apache HTTP server security

basic principles

• Minimize attack surface: enable only necessary modules and features
• Principle of least privilege: Apache is executed with a non-system administrator account
• Regular updates: Apache, OS, PHP and related modules are kept up to date

Hidden version and system information

Avoid leaking Apache and operating system versions:

ServerTokens Prod
ServerSignature Off

File and directory access control

Restrict directory access to prevent arbitrary browsing:

    AllowOverride None
    Require all denied



    AllowOverride None
    Require all granted

.htaccess usage restrictions

Close if not necessary.htaccessTo avoid performance and security risks:

AllowOverride None

Disable unnecessary mods

List currently loaded modules:

apachectl -M

Disable unused modules (based on actual needs):

• autoindex
• status
• proxy (when not used)

HTTP method restrictions

Allow only necessary HTTP methods:

    
        Require all denied
    

SSL / TLS security settings

Enable HTTPS and disable legacy protocols:

SSLProtocol all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1
SSLCipherSuite HIGH:!aNULL:!MD5
SSLHonorCipherOrder On

Prevent directory listing

To avoid showing the archive list:

Options -Indexes

Request size and timeout limits

Prevent DoS and resource exhaustion:

Timeout 60
LimitRequestBody 10485760

Error and record security

• error.log does not display sensitive information
• Set the appropriate LogLevel:

LogLevel warn

With protective module

• mod_security：Web Application Firewall
• mod_evasive: Prevent brute force requests and simple DoS

PHP related security (if using PHP)

• closuredisplay_errors
• limitopen_basedir
• Avoid using Apache modules to execute high-risk programs

suggestion

• Be sure to enable HTTPS in the official environment
• Paired with firewall (iptables/ufw/Windows Firewall)
• Regularly check logs and use intrusion detection tools

Block user attempts to hack your website

Situation description

existaccess.logorerror.logA large number of requests for non-existent or suspicious files were found, such as:

/tgrs.php
/z.php
/system_log.php
/wp-login.php
/.env

This is usuallyAutomated scanning or attack scripts, the purpose is to detect vulnerabilities.

Step one: Make sure it’s not a misjudgment

• The same IP requests multiple non-existing files in a short period of time
• Request common vulnerability file names (php, env, admin)
• User-Agent is empty or abnormal

Method 1: Use Apache to block IP directly

In Apache settings or VirtualHost add:

    Require all granted
    Require not ip 1.2.3.4

Suitable for a small number of clearly malicious IPs.

Method 2: Block specific request paths (commonly used)

Directly block known malicious file names:

    Require all denied

Or use regular expansion:

    Require all denied

Method three: mod_security (strongly recommended)

mod_securityIs Apache's Web Application Firewall that automatically blocks scanning behavior.

• Can intercept requests that do not exist but "look like vulnerabilities"
• Can limit a large number of 404 requests in a short period of time

Works best with the OWASP CRS (Core Rule Set).

Method 4: mod_evasive (anti-violence request/scan)

Automatically block IPs for a large number of requests in a short period of time:

DOSHashTableSize 3097
DOSPageCount 5
DOSSiteCount 50
DOSPageInterval 1
DOSSiteInterval 1
DOSBlockingPeriod 600

The same IP will be automatically blocked if it scans the page within a short period of time.

Method 5: Fail2ban (the most practical and recommended)

Analyze malicious behavior from Apache logs and automatically block IPs (firewall level).

• Multiple times in a row 404 / 403
• Scan specific file names

Effect:

• Block IP directly in OS firewall
• Best performance, no consumption of Apache resources

Method 6: Reduce response information (do not reply to 404 details)

Avoid letting attackers know too much:

ServerTokens Prod
ServerSignature Off

Method 7: Only allow existing files to be accessed

Reject all PHP requests for files that do not exist:

    Require expr %{REQUEST_FILENAME} -f

PHP directly 403s non-existent instead of letting PHP handle it.

Suggested practical practices (practical combination)

• Apache: Turn off directory listing, hidden versions
• Apache：FilesMatchBlocking does not exist PHP
• Fail2ban: Automatically block scanning IPs
• mod_security: WAF rules to prevent scanning

important ideas

• This type of scanhappens every day, it is not your website that is being targeted
• The key point is "quick blocking + does not affect normal users"
• Don't try to post fake pages or interactive counterattacks

Mail Server

What is Mail Server?

Mail Server is a software system specifically used for the delivery, reception and storage of email. It supports multiple email protocols such as SMTP, IMAP, and POP3. Depending on your needs, you can choose a free or commercial email server.

List of major Mail Servers

1. ArGoSoft Mail Server
2. Thunderbolt Email Server
3. Microsoft Exchange Server
4. Postfix
5. hMailServer

ArGoSoft Mail Server

• Introduction:A lightweight email server focused on simplicity and ease of use, suitable for small and medium-sized usage scenarios.
• advantage:A free version is available, supports SMTP, POP3 and IMAP, and is simple to configure.
• shortcoming:It has limited functionality and is not suitable for large-scale enterprises.

Thunderbolt Email Server

• Introduction:Designed for enterprise users, it supports multi-domain name and multi-user management and has comprehensive functions.
• advantage:It has built-in anti-spam and email backup functions and a friendly interface.
• shortcoming:The price is higher and the hardware requirements are high.

Microsoft Exchange Server

• Introduction:An enterprise email server developed by Microsoft and deeply integrated with the Office series.
• advantage:Supports collaboration functions (such as calendar and contact synchronization) with high security.
• shortcoming:The installation and management are complicated and the cost is high.

Postfix

• Introduction:An open source, efficient mail transfer agent (MTA), widely used in Linux systems.
• advantage:Free, excellent performance, supports large-scale email transmission.
• shortcoming:It lacks a graphical interface and is not friendly to novices.

hMailServer

• Introduction:A free Windows platform email server suitable for small and medium-sized businesses.
• advantage:Supports SMTP, POP3, and IMAP, is easy to install, and integrates well with antivirus software.
• shortcoming:Features are limited and not suitable for large enterprises.

Comparison summary

ISC DNS server

What are ISC DNS servers?

The ISC DNS server is a set of open source DNS software developed and maintained by the Internet Systems Consortium (ISC). The most well-known version is BIND (Berkeley Internet Name Domain). BIND It is one of the most widely used DNS servers on the Internet, providing name resolution and DNS zone management functions.

Main functions

• Support DNS zone file management
• Supports master/slave DNS server architecture
• Built-in DNSSEC (DNS Security Extensions) functionality
• Dynamic DNS update feature
• Multiple views (Views) can be configured to provide results for different clients

advantage

• Open source and free to use
• Extensive support for various operating systems
• Flexible configuration options
• Rich community and technical support

Suitable for objects

ISC DNS servers are suitable for network administrators, small and medium-sized businesses, and organizations that require customized name resolution services.

How to obtain

You can start fromISC official websiteDownload the latest version of BIND and install it according to your operating system.

What is Cloudflare?

Cloudflare is a company that provides web acceleration, security and content delivery network (CDN) services. Its main purpose is to assist websites in speeding up access, enhancing security, and protecting websites from threats such as DDoS attacks.

Key features of Cloudflare

• Content Delivery Network (CDN):Cloudflare's global server network speeds up website load times, allowing visitors to get content from the server closest to them.
• Website protection:Provides DDoS attack protection, malicious bot protection, and Web Application Firewall (WAF) to improve website security.
• DNS service:Cloudflare provides fast and secure DNS resolution services that help reduce latency and enhance network security.
• SSL/TLS encryption:Encrypt website traffic to protect data transmission security while also improving SEO rankings.

Advantages of Cloudflare

Key benefits of using Cloudflare include:

1. Improve website access speed and improve user experience.
2. Effectively resist malicious attacks and ensure website security.
3. The basic version of CDN and security features are provided for free, suitable for small and medium-sized websites.
4. Automatically manage SSL/TLS certificates to reduce website management burden.

Where to use Cloudflare

Cloudflare is great for:

• Businesses looking to speed up their website and increase security.
• Small and medium-sized websites looking for an affordable DDoS protection solution.
• Websites that require stable and fast DNS resolution services.

Database server

What is DB Server?

DB Server (database server) is a server dedicated to storing, managing and processing data. It provides efficient query capabilities, supports simultaneous access by multiple users, and ensures data security and consistency. Depending on their needs, businesses and individuals can choose different database server software.

Main DB Server List

1. MySQL
2. Microsoft SQL Server（MS SQL）
3. Oracle Database
4. PostgreSQL
5. MongoDB

MySQL

• Introduction:An open source relational database management system suitable for a variety of application scenarios.
• advantage:Free (open source version), easy to learn and deploy, and massive community support.
• shortcoming:Some advanced features require commercial licensing and may not perform as well as Oracle for very large scale data.

Microsoft SQL Server（MS SQL）

• Introduction:Developed by Microsoft, it is a relational database management system that focuses on enterprise-level applications.
• advantage:Deeply integrated with the Windows environment to support powerful reporting and analysis functions.
• shortcoming:A paid license is required and only supports Windows and some Linux platforms.

Oracle Database

• Introduction:The industry's leading enterprise-level database management system, suitable for ultra-large-scale data management.
• advantage:It has comprehensive functions, supports high availability and distributed architecture, and has extremely high performance.
• shortcoming:Licensing is expensive and the learning curve is steep.

PostgreSQL

• Introduction:A high-performance open source relational database that supports multiple data types and extended functions.
• advantage:It is free, supports JSON data processing, and has functions close to those of commercial databases.
• shortcoming:It is relatively complex to configure and learn for novices.

MongoDB

• Introduction:A NoSQL database based on document storage, suitable for processing unstructured data.
• advantage:High flexibility, suitable for big data applications, supports sharding and replica sets.
• shortcoming:It is not suitable for traditional relational data models and has poor complex query performance.

Comparison summary

MariaDB

MariaDB is an open source relational database management system (RDBMS) created by the creators of MySQL and is fully backwards compatible with MySQL. It is designed for high performance, stability, and security and is used worldwide, especially in enterprise environments.

sudo apt update
sudo apt install mariadb-server
        

sudo systemctl start mariadb
sudo mysql_secure_installation
        

ODBC Driver

What is an ODBC Driver?

ODBC (Open Database Connectivity) Driver is a standard database connection interface that allows applications to communicate with different types of databases through a unified API. ODBC Driver It is the middleware software responsible for translating requests made by applications so that they can interact with back-end databases.

ODBC Driver functions

• Connect to different types of databases, including relational databases (such as MySQL, MS SQL Server) and NoSQL databases.
• Provides a unified API so developers can use the same code to access multiple databases.
• Supports data query, insertion, update and delete operations.

How ODBC works

1. The application makes database requests (such as SQL queries).
2. The ODBC driver converts the request into a language understood by the database.
3. The database processes the request and returns the results.
4. The ODBC driver converts the results into a format usable by the application.

Advantages of ODBC Driver

• Cross-platform compatibility:Allows seamless communication between different operating systems and databases.
• Reduce development costs:Use a unified interface to eliminate the need to write separate code for each database.
• flexibility:Supports multiple database types and is suitable for various application scenarios.

Disadvantages of ODBC Driver

• Performance may be lower than drivers that connect directly to the database.
• Configuration is more complex, especially in multi-platform environments.
• Limited support for certain database features.

Common ODBC Drivers

• MySQL ODBC Driver
• Microsoft ODBC Driver for SQL Server
• PostgreSQL ODBC Driver
• Oracle ODBC Driver
• SQLite ODBC Driver

How to configure the ODBC Driver

1. Download and install the ODBC Driver for the corresponding database.
2. Configure the data source name (DSN) through the ODBC Data Source Administrator.
3. Use the configured DSN to connect to the database in your application.

cloud computing

definition

Cloud Computing is a model that provides computing resources through the Internet, including servers, storage spaces, databases, networks, software and analysis tools, etc. Users can dynamically access these resources on demand without building or maintaining physical equipment themselves.

Core features

• 🌐 Ready to use:Quickly start or stop services as needed
• 📈 Highly flexible and scalable:Resources automatically adjust based on usage
• 💰 Cost advantage:Billing based on usage reduces hardware investment and maintenance costs.
• 📦 Centralized management:Unified control of applications, data and security

Three major service models

• IaaS（Infrastructure as a Service）：Provide virtual servers, storage devices and network equipment (such as AWS EC2, Microsoft Azure)
• PaaS（Platform as a Service）：Provide development platforms and tools to simplify application development and deployment (such as Google App Engine, Azure App Service)
• SaaS（Software as a Service）：Provide online application software, such as email, CRM, ERP (such as Google Workspace, Salesforce)

Application scope

• Data backup and disaster recovery
• Web services and APP deployment
• Artificial intelligence and big data analysis
• Enterprise Resource Planning (ERP), Customer Relationship Management (CRM)
• IoT device data integration and visualization

advantage

• Rapid deployment and global availability
• Simplify IT management and upgrades
• Improve data availability and collaboration capabilities
• Support cross-device and cross-location access

challenge

• Data security and privacy concerns
• Depends on network connection quality
• Cloud vendor lock-in issues
• Compliance and data sovereignty issues

main suppliers

• Amazon Web Services（AWS）
• Microsoft Azure
• Google Cloud Platform（GCP）
• Alibaba Cloud
• IBM Cloud

future trends

Cloud computing will continue to integrate with edge computing, artificial intelligence, 5G, and quantum computing, developing towards a smarter and more distributed hybrid cloud and multi-cloud environment, accelerating the digital transformation and automation process of enterprises.

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