Install the Let's Encrypt certbot utility

If you have decided to use Let's Encrypt certificates, it is necessary to install the certbot utility or an equivalent utility implementing the Automated Certificate Management Environment (ACME). Install certbot using the package manager as demonstrated in Example 9.3, “Installing certbot on Debian/Ubuntu” and Example 9.4, “Installing certbot on Fedora/RHEL/CentOS”.

Example 9.3. Installing certbot on Debian/Ubuntu

$ sudo apt-get install -t jessie-backports ssl-cert certbot

Example 9.4. Installing certbot on Fedora/RHEL/CentOS

$ sudo yum install certbot