Letsencrypt/DV証明書/renewal/2018-05-31について、ここに記述してください。

root@f:/service # svc -d wiki0 httpd pound
root@f:/service # svstat *
axfrdns: up (pid 75183) 19521736 seconds
axfrdns2: up (pid 75184) 19521736 seconds
dnscache: up (pid 75185) 19521736 seconds
dnscache2: down 5893932 seconds
httpd: down 3 seconds, normally up
pound: down 3 seconds, normally up
qmail-start: up (pid 85031) 26289843 seconds
smtpd: up (pid 85032) 26289843 seconds
sshd: up (pid 85033) 26289843 seconds
tinydns: up (pid 75187) 19521736 seconds
tinydns1: up (pid 75188) 19521736 seconds
wiki: down 13498005 seconds
wiki0: down 3 seconds, normally up

root@f:/service # which certbot
/usr/local/bin/certbot

root@f:/service # certbot certonly --standalone -d moin.qmail.jp
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Cert is due for renewal, auto-renewing...
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for moin.qmail.jp
Waiting for verification...
Cleaning up challenges
Generating key (2048 bits): /usr/local/etc/letsencrypt/keys/0006_key-certbot.pem
Creating CSR: /usr/local/etc/letsencrypt/csr/0006_csr-certbot.pem

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at
   /usr/local/etc/letsencrypt/live/moin.qmail.jp/fullchain.pem. Your
   cert will expire on 2018-02-20. 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

!!! ??? !!!

Your cert will expire on 2018-02-20.