[xxxxxxx@dennou-lab ~]$ sudo certbot renew
Saving debug log to /var/log/letsencrypt/letsencrypt.log

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Processing /etc/letsencrypt/renewal/dennou-lab.com.conf
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Cert is due for renewal, auto-renewing...
Plugins selected: Authenticator apache, Installer apache
Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for dennou-lab.com
Waiting for verification...
Cleaning up challenges

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new certificate deployed with reload of apache server; fullchain is
/etc/letsencrypt/live/dennou-lab.com/fullchain.pem
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Congratulations, all renewals succeeded. The following certs have been renewed:
/etc/letsencrypt/live/dennou-lab.com/fullchain.pem (success)
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[xxxxxxx@dennou-lab ~]$