Ubuntu 20.04 & 18.04
Install Certbot package. Available standard repository.
Ubuntu 20.04
$ sudo apt install certbot python3-certbot-apache
Ubuntu 18.04
$ sudo apt install letsencrypt python-certbot-apache
Before execution ‘certbot’, rewrite apache module must be available.
# a2enmod rewrite
1st time recommended command is
Ubuntu 20.04
# certbot --apache
Ubuntu18.04
# certbot run --apache --dialog
This command is able to find non ssl web setting and auto update certificate and chain by reading /etc/apache2/sites-available directory. And also is fixes virtual host configuration files. And then restarting apache.
# systemctl restart apache2.service
Renewal certification file, certbot-auto command.
# certbot renew --post-hook "systemctl restart apache2.service"
also available cron daemon setting.
example file, letsencrypt can be put on /etc/cron.monthly/ ,
#!/bin/sh # update (renew) cert. /usr/bin/certbot renew --post-hook "systemctl restart apache2.service"
Japanese “Let’s Encrypt” site is https://letsencrypt.jp/.