These Instructions are for a ubuntu server with nginx as the server. Also this method is to get free certificates from an opensource way and needs the website name to be publicly accessible. These instructions may not help any other setting
Before getting the certificates. It is necessary that there are two DNS A records for website name i.e. demonodepublicdns, www.demonodepublicdns.
Certification Example
root@ubuntu:~# sudo apt-get update
root@ubuntu:~# sudo apt-get -y install git bc
root@ubuntu:~# sudo git clone https://github.com/letsencrypt/letsencrypt /opt/letsencrypt
root@ubuntu:~# sudo apt-get install nginx
Do you want to continue? [Y/n] y
root@ubuntu:~# cd /opt/letsencrypt
root@ubuntu:/opt/letsencrypt# ./letsencrypt-auto certonly -a webroot --webroot-path=/usr/share/nginx/html -d demonodepublicdns -d www.demonodepublicdns
┌──────────────────────────────────────────────────────────────────────┐
│ Enter email address (used for urgent notices and lost key recovery) │
│ ┌──────────────────────────────────────────────────────────────────┐ │
│ │xxxx@xxxx.xxx │ │
│ └──────────────────────────────────────────────────────────────────┘ │
├──────────────────────────────────────────────────────────────────────┤
│ < OK > <Cancel> │
└──────────────────────────────────────────────────────────────────────┘
┌──────────────────────────────────────────────────────────────────────┐
│ Please read the Terms of Service at │
│ https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf. You │
│ must agree in order to register with the ACME server at │
│ https://acme-v01.api.letsencrypt.org/directory │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
├──────────────────────────────────────────────────────────────────────┤
│ <Agree > <Cancel> │
└──────────────────────────────────────────────────────────────────────┘
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at
/etc/letsencrypt/live/demonodepublicdns/fullchain.pem. Your cert
will expire on 2016-09-29. To obtain a new or tweaked version of
this certificate in the future, simply run letsencrypt-auto again.
To non-interactively renew *all* of your certificates, run
"letsencrypt-auto renew"
- If you like Certbot, please consider supporting our work by:
Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate
Donating to EFF: https://eff.org/donate-le
root@ubuntu:/opt/letsencrypt# ls /etc/letsencrypt/live/demonodepublicdns/
cert.pem chain.pem fullchain.pem privkey.pem
root@ubuntu:/opt/letsencrypt# vim /etc/nginx/sites-available/default root@ubuntu:/opt/letsencrypt# sudo service nginx reload