How to protect Nginx server from DDoS attacks

With the rapid development of the Internet, network security issues have become one of the important issues that we cannot ignore. DDoS attacks are one of the most common and destructive attacks in the field of cybersecurity. Many companies and organizations are facing the risk of DDoS attacks, and Nginx, as an excellent web server, has become the first choice target of attackers. In this article, we will introduce how to protect Nginx server from DDoS attacks.

1. What is a DDoS attack?

DDoS attack (Distributed Denial of Service) means that the attacker uses multiple infected computers to send massive requests to the target server in a coordinated manner, thereby preventing the server from working properly. Usually, attackers will use this attack method to make the target website inaccessible, thereby affecting the normal operation of the website. DDoS attacks usually use various methods, such as: SYN Flood attack, HTTP Flood attack, UDP Flood attack, etc.

2. How to protect Nginx server from DDoS attacks?

(1) Caching strategy

Caching is an effective strategy to reduce server pressure. By caching frequently used data in memory, the server's read and write requests to disk can be reduced. This not only improves the performance of the server, but also helps the server handle requests better when suffering from DDoS attacks.

(2) Use DDoS protection equipment

It is a common practice to use DDoS protection equipment when preventing DDoS attacks. This device monitors network traffic and detects unusual requests. If a DDoS attack is detected, it can automatically filter out the attack traffic and forward only normal traffic to the server.

(3) Use tools to limit the number of connections

Limiting the number of connections is an effective way to defend against DDoS attacks. You can use tools such as iptables to set limits on the number of connections. If more than the specified number of connection attempts are made to the server, these connection requests will be rejected or redirected to another virtual server. By setting this method up, you can help reduce the load on your server and defend against DDoS attacks.

(4) Use reverse proxy

Reverse proxy can effectively defend against DDoS attacks because it concentrates all requests to the proxy server. An attacker can only attack the IP address of the proxy server and cannot attack the actual server IP address. Therefore, using a reverse proxy can effectively help defend against DDoS attacks.

(5) Use CDN

CDN (Content Delivery Network) is a distributed network architecture that copies website content to different cache servers and distributes traffic to the nearest Cache server. Since CDN has a large number of server resources, attackers need to attack multiple nodes to launch an effective attack, which is very beneficial to DDoS defense.

3. Summary

DDoS attack is one of the most common attacks in the field of network security. By using caching strategies, DDoS protection devices, tools to limit the number of connections, reverse proxies, and CDNs, we can help protect our Nginx servers from DDoS attacks. However, it should be noted that these measures are a way to prevent DDoS attacks and cannot completely guarantee the prevention of any attacks by attackers. In daily work, it is necessary to frequently update firewalls, server operating systems, databases and other software to improve the security of the Nginx server.

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