Why virtual hosting serves multiple domains in Nginx - Challenge Your Understanding

Challenge - 5 Problems

🧠 Conceptual

intermediate

How does virtual hosting allow multiple domains on one server?

Imagine you have one apartment building but many tenants. How does virtual hosting in nginx let one server handle many websites (domains) like tenants in that building?

A It uses the Host header in HTTP requests to serve the right website for each domain.

B It requires a separate physical server for each domain.

C It uses different IP addresses for each domain on the same server.

D It changes the server's hostname dynamically for each request.

💡 Hint

Think about how a receptionist knows which tenant to call by reading the visitor's name on the request.

Virtual hosting uses the Host header sent by the browser to decide which website to show. This way, one server can serve many domains by checking the requested domain name.

💻 Command Output

intermediate

What is the output of nginx when virtual hosting is configured?

Given this nginx server block configuration snippet, what will nginx do when a request comes for example.com?

Nginx

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

A Serve files from /var/www/example for all domains regardless of Host header.

B Serve files from /var/www/example when the Host header is example.com.

C Return a 404 error for example.com requests.

D Redirect example.com requests to another server.

💡 Hint

Check how server_name matches the Host header.

The server block listens on port 80 and serves files from /var/www/example only when the Host header matches example.com.

❓ Troubleshoot

advanced

Why does nginx serve the wrong website for a domain?

You configured two server blocks for site1.com and site2.com. But when you visit site2.com, nginx shows site1.com content. What is the most likely cause?

Nginx

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

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

A The DNS for site2.com points to a different server.

B The root directory for site2.com is empty.

C The server_name for site2.com is misspelled or missing.

D Nginx does not support multiple server blocks on the same port.

💡 Hint

Check if nginx matches the Host header correctly.

If the server_name for site2.com is wrong or missing, nginx will use the default server block, often the first one, causing site1.com content to show.

🔀 Workflow

advanced

Order the steps to add a new domain to nginx virtual hosting

Put these steps in the correct order to add a new domain mynewsite.com to an nginx server using virtual hosting.

A 1,4,2,3

B 2,1,4,3

C 1,2,4,3

D 4,1,2,3

💡 Hint

Think about preparing files before telling nginx about them.

First create the directory, then upload files, add the server block, and finally reload nginx to apply changes.

✅ Best Practice

expert

Which practice ensures secure virtual hosting for multiple domains?

When hosting multiple domains on one nginx server, which practice best improves security and isolation?

A Use the same root directory for all domains to simplify management.

B Run nginx as root to allow access to all domain files.

C Disable SSL to avoid certificate conflicts between domains.

D Use separate user permissions and directories for each domain's files.

💡 Hint

Think about limiting damage if one site is compromised.

Using separate users and directories limits access and damage scope, improving security for each domain.