更新を忘れていたらしい。
# /usr/local/bin/certbot-auto renew
Upgrading certbot-auto 1.6.0 to 1.9.0...
Replacing certbot-auto...
Creating virtual environment...
Installing Python packages...
Installation succeeded.
Saving debug log to /var/log/letsencrypt/letsencrypt.log
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Processing /etc/letsencrypt/renewal/ssiscirine.moe.hm.conf
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Cert is due for renewal, auto-renewing...
Plugins selected: Authenticator webroot, Installer None
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for ssiscirine.moe.hm
Using the webroot path /****/****/******** for all unmatched domains.
Waiting for verification...
Cleaning up challenges
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new certificate deployed without reload, fullchain is
/etc/letsencrypt/live/ssiscirine.moe.hm/fullchain.pem
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Congratulations, all renewals succeeded. The following certs have been renewed:
/etc/letsencrypt/live/ssiscirine.moe.hm/fullchain.pem (success)
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#これだけでは配信しているhttpsの電子証明書が古いまま（2020/10/29迄）なので、
# systemctl restart httpd証明書の有効期間は、2021年1月30日まで。