Turn Your Laptop into a Server: Host Web Apps Locally with Coolify and Cloudflare Tunnels

Source: Dev.to

Note – If your ISP allows normal port‑forwarding, you can skip the tunnel part.
Many ISPs, however, use CGNAT (Carrier‑Grade NAT). In that case your public IP/ports are not reachable from the outside, even if you configure port forwarding on your router.

How to know you’re behind CGNAT

1. Check the WAN/Internet IP shown in your router’s admin page.
2. Visit a site like .
3. If the two IPs differ, you’re behind CGNAT.

Typical CGNAT range: 100.64.0.0 – 100.127.255.255.

If you’re behind CGNAT, Cloudflare Tunnels will solve the problem.
Coolify gives you a beautiful UI to manage and deploy multiple projects.

Step 1 – Install Coolify

Run the installer (it also installs Docker if needed):

curl -fsSL https://cdn.coollabs.io/coolify/install.sh | sudo bash

After installation

• Local machine – Open http://localhost:8000 in a browser and create the root user.
• VPS – Open http://:8000.

You’ll now see the Coolify dashboard, ready to deploy Node.js, Next.js, Python, WordPress, databases, etc.

Step 2 – Deploy a Demo Project

1. In Coolify click Public Repository.

2. Paste the repo URL (example):

   https://github.com/vimal-verma/vimalverma.in

3. Choose Docker as the Build Pack and click Continue.

   

4. Network settings (important for later custom‑domain linking):

   • Ports Exposed: 3000
   • Port Mappings: 3000:3000

5. Click Deploy.

Coolify will generate a temporary URL that looks like:

http://xo0gcogkks04ks4sgkk84oww..sslip.io

Test the deployment

• If you’re on a VPS or your ISP isn’t using CGNAT, the link works immediately.
• Locally you can reach the app at http://:3000/ (e.g., http://10.0.0.1:3000/).

Optional – Attach a custom domain

1. Add an A record for your domain pointing to your public IP.
2. In the Coolify dashboard, set the Domain field to your domain, save, and redeploy.

Step 3 – Bypass CGNAT with Cloudflare Tunnels

If the public link from Step 2 isn’t reachable (likely because of CGNAT), expose the dashboard via a Cloudflare Tunnel.

1. Install cloudflared

Download the binary from the official docs.

2. Authenticate

cloudflared tunnel login

3. Create a tunnel

cloudflared tunnel create <NAME>

The command returns a UUID – copy it; you’ll need it for the config file.

4. Create a configuration file

# ~/.cloudflared/config.yml
url: http://localhost:8000
tunnel: <UUID>
credentials-file: /root/.cloudflared/<UUID>.json

5. Route a DNS sub‑domain

Make sure your domain is already added to Cloudflare.

cloudflared tunnel route dns <NAME> <subdomain.example.com>

6. Run the tunnel

cloudflared tunnel run <NAME>

If you have multiple tunnels, specify the config path:

cloudflared tunnel --config /path/to/config.yml run <NAME>

7. Verify

cloudflared tunnel info <NAME>

Now https://subdomain.example.com securely serves your Coolify dashboard, even from behind CGNAT. Log in with the same email/password you created in Step 1.

🎉 You’re done!

• Local deployment works via http://localhost:8000 (or your LAN IP).
• Public access works via the Cloudflare Tunnel URL or a custom domain you pointed to the tunnel.

Enjoy a fully self‑hosted, Vercel‑like platform on your own hardware! 🚀

Step 4 – Routing Your Custom Domain to Your App

Now that the tunnel is active, you’ll probably want to route traffic directly to your published app (running on port 3000) instead of the Coolify dashboard.

How to add a custom link to your sub‑domain

1. Open Cloudflare

   • Go to Dashboard → Networking → Tunnels.

2. Select your local tunnel

   • Click the tunnel you just created.

3. Add a route

   • In the Routes section, click Add routes.
   • Choose Published application.

4. Configure the route

   Field	Value
   Sub‑domain	www
   Service URL	http://localhost:3000

   Click Add route to save.

5. Update Coolify configuration

   • In the Coolify dashboard, go to Projects → your project → Configuration → General.
   • Change Domains to www.example.com.
   • Save the changes and Redeploy the project.

Your locally hosted application is now live and reachable at www.example.com.

Happy self‑hosting!