使用certbot续期ssl证书renew时遇到问题

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遇到的问题如下：IMPORTANT NOTES:

 - The following errors were reported by the server:


   Domain: www.miling.online
   Type:   unauthorized
   Detail: Invalid response from
   http://www.miling.online/.well-known/acme-challenge/8IPPiMABwsHSwqSSTfZ5XMv7wD9sqXdO1pzOwFebdzg
   [2001:470:35:bf9::2]: 404


   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A record(s) for that domain
   contain(s) the right IP address.
[root@iZuf6istfz0zvz8dbdfyxxZ ~]# certbot-auto renew --force-renew
-bash: certbot-auto: command not found
[root@iZuf6istfz0zvz8dbdfyxxZ ~]# 
[root@iZuf6istfz0zvz8dbdfyxxZ ~]# 1
-bash: 1: command not found
[root@iZuf6istfz0zvz8dbdfyxxZ ~]# certbot renew --quiet
Attempting to renew cert from /etc/letsencrypt/renewal/www.miling.online.conf produced an unexpected error: Failed authorization procedure. www.miling.online (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://www.miling.online/.well-known/acme-challenge/o30LM-8eAdn4IB8vX96Aa1Xgs6Mwc-5QjJNQ8mjl_Ns [2001:470:35:bf9::2]: 404. Skipping.


All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/www.miling.online/fullchain.pem (failure)

1 renew failure(s), 0 parse failure(s)

最后查看了certbot的帮助

依次运行：

# service nginx stop

# certbot --force-renewal

# certbot certonly

# certbot renew --dry-run

# cerbot nginx start

需要注意的是service nginx stop/start，否则会出现问题