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Table of Contents
1. Use Virtual Host function
2. Notes on enabling HTTPS
3. DNS resolution must be accurate
Home Operation and Maintenance Apache How to host multiple websites on a single IP address?

How to host multiple websites on a single IP address?

Jul 12, 2025 am 12:14 AM
IP address Website Hosting

You can implement multiple websites by configuring virtual host and domain name resolution. The specific steps are as follows: 1. Use the virtual host function to configure different domain names to correspond to different website directories through VirtualHost or server blocks in Apache or Nginx; 2. Pay attention to SNI support issues when enabling HTTPS, and configure independent SSL certificates for each domain name; 3. Resolve all domain names to the same IP address and point to the server's public network IP through A records. As long as the configuration is correct, adding new websites only requires adding virtual host blocks and domain name resolution.

In fact, as long as the method is right, it is completely feasible to run multiple websites with one IP address. The key is to make good use of domain name and server configuration.


1. Use Virtual Host function

This is the most common and practical approach, especially for mainstream web server software such as Apache or Nginx.

  • Apache : Use VirtualHost configuration block to distinguish different domain names. Each domain name can point to a different website directory.

    Sample configuration:

     <VirtualHost *:80>
      ServerName site1.com
      DocumentRoot /var/www/site1
    </VirtualHost>
    
    <VirtualHost *:80>
      ServerName site2.com
      DocumentRoot /var/www/site2
    </VirtualHost>
  • Nginx : Use server blocks to set the processing logic for different domain names.

    Sample configuration:

     server {
      listen 80;
      server_name site1.com;
      root /var/www/site1;
    }
    
    server {
      listen 80;
      server_name site2.com;
      root /var/www/site2;
    }

As long as you correctly resolve the domain name to this IP address, the browser will automatically bring the domain name information when accessing, and the server can return the content of the corresponding website based on this information.


2. Notes on enabling HTTPS

If you plan to add an SSL certificate to these websites, then you should pay attention to the support issues of SNI (Server Name Indication).

  • Most modern browsers and servers support SNI, so you can safely configure independent SSL certificates for each domain name.
  • If you are using an old version of the system or an environment that does not support SNI, you may have to consider other methods, such as using wildcard certificates uniformly (provided that these domain names belong to the same primary domain).

When configuring HTTPS, you only need to add the listening port 443 and certificate path to the virtual host configuration, and there is no problem with one set of certificates per site.


3. DNS resolution must be accurate

All the website domain names you want to host need to be parsed on the same IP of this server.

  • Log in to your domain name management platform (such as Alibaba Cloud, Cloudflare, etc.)
  • Add A record to point to your server's public IP
  • No port mapping or other complicated operations are required

In this way, no matter which domain name the user visits, he will first arrive at the server, and then the server will decide which website content to display.


Basically that's it. Although it seems a bit technical, as long as it is configured once, the subsequent addition of new websites will only add a virtual host block and domain name resolution. It is not complicated, but it is easy to ignore details, such as spelling errors or failure to restart the service. These minor problems are more likely to get stuck.

The above is the detailed content of How to host multiple websites on a single IP address?. For more information, please follow other related articles on the PHP Chinese website!

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