Setting up TLS for EteSync is a breeze by using Certbot.
This tutorial assumes you're using Nginx as web server.
Install Certbot
First, make sure your server is reachable by HTTP, and that the HTTPS port (443) is also open.
On your server machine, add the Certbot PPA and install it. (Note: these instructions are for Ubuntu. For other operating systems, visit certbot's site.)
sudo apt-get update
sudo apt-get install software-properties-common
sudo add-apt-repository universe
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install certbot python-certbot-nginx
Run Certbot
Next, run the following command to automatically have Certbot edit your Nginx configuration to work with TLS.
sudo certbot --nginx
Lastly, confirm that it worked by vising https://yourdomain.com.
Enjoy EteSync :)
And that's it!
Certbot should have installed everything correctly.
Your certificates should renew automatically after a certain period of time.
After adding HTTPS to your server, you're be done. Congrats!
It might be a good idea to close your HTTP port now if you don't use it for anything else.