Connection limiting (limit_conn) in Nginx - Mini Project: Build & Apply

Connection limiting with nginx using limit_conn

📖 Scenario: You are managing a web server that sometimes gets too many connections from the same user. This can slow down the server for everyone else. To keep the server fast and fair, you want to limit how many connections each user can have at the same time.

🎯 Goal: You will create an nginx configuration that limits the number of simultaneous connections from the same IP address to 2. This helps protect your server from overload and keeps it running smoothly.

📋 What You'll Learn

Create a shared memory zone called addr_limit with size 10m

Set the connection limit to 2 per IP address

Apply the limit to the / location

Print the final nginx configuration snippet

💡 Why This Matters

🌍 Real World

Web servers often face many users connecting at once. Limiting connections per user helps keep the server responsive and fair for everyone.

💼 Career

Knowing how to configure nginx connection limits is useful for system administrators and DevOps engineers to maintain server stability and security.

1

Create the shared memory zone for connection limiting

Write the nginx directive limit_conn_zone to create a shared memory zone called addr_limit with size 10m using the client IP address $binary_remote_addr as the key.

Nginx

# Your code here

Need a hint?

This directive defines a memory zone to track connections by client IP.

2

Set the connection limit value

Write the nginx directive limit_conn to set the connection limit to 2 using the zone addr_limit.

Nginx

limit_conn_zone $binary_remote_addr zone=addr_limit:10m;
# Your code here

Need a hint?

This directive sets how many connections each IP can have at once.

3

Apply the connection limit to the root location

Write an nginx server block with a location / block inside it. Inside the location /, add the directive limit_conn addr_limit 2; to apply the connection limit.

Nginx

limit_conn_zone $binary_remote_addr zone=addr_limit:10m;
limit_conn addr_limit 2;

server {
    # Your code here
}

Need a hint?

The limit_conn directive inside the location applies the limit to requests.

4

Print the final nginx configuration

Write a command to print the entire nginx configuration you wrote so far.

Nginx

limit_conn_zone $binary_remote_addr zone=addr_limit:10m;

server {
    location / {
        limit_conn addr_limit 2;
    }
}

# Your code here

Need a hint?

Use a print statement to show the full configuration text.