Install docker 🙂

Create folder

Create a subfolder called “letsencrypt” to store your keys.

Run certbot on Docker

docker run -v ${pwd}/letsencrypt:/etc/letsencrypt -it certbot/certbot certonly --manual --preferred-challenges dns

Important: On MacOS make sure to use ${PWD} instead of ${pwd}

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): youremail@yourdomain.com

-------------------------------------------------------------------------------
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v01.api.letsencrypt.org/directory
-------------------------------------------------------------------------------
(A)gree/(C)ancel: A

-------------------------------------------------------------------------------
Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about EFF and
our work to encrypt the web, protect its users and defend digital rights.
-------------------------------------------------------------------------------
(Y)es/(N)o: Y
Please enter in your domain name(s) (comma and/or space separated)  (Enter 'c'
to cancel): yourdomain.com
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for yourdomain.com

-------------------------------------------------------------------------------
NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you're running certbot in manual mode on a machine that is not
your server, please ensure you're okay with that.

Are you OK with your IP being logged?
-------------------------------------------------------------------------------
(Y)es/(N)o: y

-------------------------------------------------------------------------------
Please deploy a DNS TXT record under the name
_acme-challenge.yourdomain.com with the following value:

FFiORjC6Z6TCHDzCmMnfMw-6cn7LrB7jfIR2pn2AqOM

Before continuing, verify the record is deployed.
-------------------------------------------------------------------------------
Press Enter to Continue

Create the TXT record following the instructions above, then press enter.

Waiting for verification...
Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/yourdomain.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/yourdomain.com/privkey.pem
   Your cert will expire on 2018-06-10. 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"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - 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

Find the keys under the letsencrypt/archive folder

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