1. `sudo service nginx-sp stop`
1. Uncomment ssl lines from `/etc/nginx-sp/vhosts.d/<domain>-ssl.conf`
2. `cd opt/letsencrypt`
3. `sudo -H ./letsencrypt-auto certonly --standalone -d <domain>.com`
4. `sudo service nginx-sp start`

```
cd /etc/nginx-sp/vhosts.d/
```