yum install certbot

pip install --upgrade --force-reinstall 'requests==2.6.0' urllib3

certbot certonly --webroot -w /usr/share/nginx/HTML/Git -d git.xmyunce.com

Starting new HTTPS connection (1): supporters.eff.org Obtaining a new certificate Performing the following challenges: http-01 challenge for git.xmyunce.com Using the webroot path /usr/share/nginx/HTML/Git for all unmatched domains. Waiting for verification... Cleaning up challenges Failed authorization procedure. git.xmyunce.com (http-01): urn:ietf:params:acme:error:dns :: DNS problem: SERVFAIL looking up CAA for git.xmyunce.com

IMPORTANT NOTES:

• The following errors were reported by the server:

  Domain: git.xmyunce.com Type: None Detail: DNS problem: SERVFAIL looking up CAA for git.xmyunce.com

• 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.

  
  certbot certonly --standalone -d git.xmyunce.com

https://fairy.live/?p=492 http://diamondfsd.com/lets-encrytp-hand-https/