Normally, Let's Encrypt generated certificates last a month. It's the job of the server admin to make sure those certificates are renewed in a monthly bases. This can be done manually, by running in the terminal:
/opt/certbot-auto renew \
--noninteractive \
--post-hook "service nginx restart"or by placing a script containing code above in /etc/cron.monthly/ folder.
- letsencrypt_cert_renewal: contains the shell comand to execute renewal non interactively (without needing you to do something else)
- certbo_renew.sh: Script that symlinks letsencrypt_cert_renewal in
/etc/cron.monthly/folder