issue a ssl for stand alone application type

~$ sudo certbot certonly --standalone
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator standalone, Installer None
Please enter in your domain name(s) (comma and/or space separated) (Enter 'c'
to cancel): my.domain.com
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for my.domain.com
Waiting for verification...
Cleaning up challenges
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/my.domain.com/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/my.domain.com/privkey.pem
Your cert will expire on XXXX-XX-XX. To obtain a new or tweaked
version of this certificate in the future, simply run certbot
again. To non-interactively renew *all* of your certificates, run
"certbot 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
~$

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