To link custom domains to your self-hosted Odoo website:

Set up DNS: Point your domain to your Odoo server's IP address using an A record or CNAME at your domain registrar.

Configure Odoo: Go to Website > Configuration > Settings in Odoo and add your domain.

Update Web Server (Nginx/Apache): Add a server block (Nginx) or VirtualHost (Apache) to point your domain to the Odoo instance.

Restart Web Server: Apply changes by restarting Nginx or Apache.

Test: Visit the domain in your browser to check if it's linked.

Make sure to configure SSL if using HTTPS.

Linking a Domain to an Odoo Website Hosted on a VPS

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1. Point Your Domain to the VPS (DNS Setup)

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Go to your domain registrar (e.g., GoDaddy, Namecheap, Cloudflare) and set:

- A Record:

  - Host/Name: @ (or www for subdomain)

  - Type: A

  - Value/IP: Your VPS public IP address

  - TTL: Default or 3600 seconds

Optional: Add both @ and www A records pointing to the same IP.

2. Configure Odoo to Use Your Domain

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On your VPS:

- Edit Odoo config file (e.g., /etc/odoo/odoo.conf)

- Enable proxy mode:

  proxy_mode = True

3. Set Up a Reverse Proxy with Nginx (Recommended)

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Install Nginx to forward requests to Odoo.

more details in the below link:

https://www.odoo.com/documentation/18.0/administration/on_premise/deploy.html#https

4. Get a Free SSL Certificate (HTTPS)

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Install Certbot and enable HTTPS:

$ sudo apt install certbot python3-certbot-nginx
$ sudo certbot --nginx

This updates the Nginx config to serve your site securely.

5. Restart Everything

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Restart Odoo and Nginx:

$ sudo systemctl restart odoo
$ sudo systemctl restart nginx

Now, your Odoo website should be accessible domain name