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Can I run Apache and Nginx on the same AWS EC2 instance?

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Yes ✅ you can install another web server like Nginx, but there is one important rule you must understand first.

1️⃣ Can multiple web servers be installed?

✔ YES — installed

❌ NO — running on the same port (by default)

You can install:

  • httpd (Apache)
  • nginx

at the same time.

But you cannot run both on port 80 at the same time.

2️⃣ Why port 80 is the problem

By default:

  • Apache (httpd) → listens on port 80
  • Nginx → listens on port 80

Only one process can bind to a port.

So:

  • One will start ✅
  • The other will fail ❌

3️⃣ Check if Apache is currently running

sudo systemctl status httpd

If you see:

Active: active (running)

👉 Apache is running on port 80.

4️⃣ You can safely install Nginx now

Installing does not affect Apache.

sudo yum install nginx -y

This only:

  • Downloads packages
  • Installs files
  • Does NOT start nginx automatically

5️⃣ What happens if you start Nginx now?

If Apache is running:

sudo systemctl start nginx

You’ll likely see:

Failed to start nginx.service: Address already in use

This is normal, not an error in installation.

6️⃣ Two safe ways to use both web servers

✅ Option 1: Stop Apache, use Nginx

sudo systemctl stop httpd
sudo systemctl disable httpd

Then:

sudo systemctl start nginx
sudo systemctl enable nginx

👉 Now Nginx uses port 80.

✅ Option 2: Run both using different ports (Learning setup)

Change Nginx port to 8080.

sudo vi /etc/nginx/nginx.conf

Change:

listen       80;

To:

listen       8080;

Then:

sudo systemctl start nginx

Access:

http://<EC2-IP>:8080

7️⃣ Check which service is using port 80

Very important command:

sudo ss -tulnp | grep :80

or

sudo lsof -i :80

This tells you exactly which process is using the port.

8️⃣ Why would someone install both?

Common real-world reasons:

  • Learning & comparison
  • Migrating from Apache → Nginx
  • Apache for legacy apps, Nginx as reverse proxy
  • Load balancing setup

9️⃣ AWS EC2 security group reminder ⚠️

Make sure:

  • Port 80 is allowed (HTTP)
  • Port 8080 is allowed (if used)

Security Group → Inbound rules

✅ Final Answer (Simple)

✔ You can install Nginx even if Apache exists ✔ You cannot run both on port 80 ✔ Stop one OR change port ✔ This is normal Linux behavior