How to renew letsencrypt automaticly

Assuming Let's Encrypt is setup and we are using apache.

We can renew all certificates by running:

 certbot renew --apache

But if we want to automate this, we can put this in a cronjob.

Run the following command as root:

crontab -e

Then insert this line:

0 */12 * * * root certbot -q renew --apache

Now the certificate will be checked every 12 hours, and refreshed if it expires withing 30 days.