Let’s encrypt is a cool initiative that provides free SSL certificates to enable https everywhere.
To make the certificate installation process as painless as possible, they provide automated tools for many OSes.
Download their tool, run it on your Apache server and you have https without those scary warnings that we get with unpaid SSL certificates.
Their tool mostly works. Running certbot-auto on Ubuntu 14.04 gave me the error below:
Error in checking parameter list: AH00526: Syntax error on line 115 of /etc/apache2/sites-enabled/000-default-le-ssl.conf:
SSLCertificateFile: file ‘/etc/apache2/insert_cert_file_path’ does not exist or is empty
The solution is to enable the Apache SSL module before running certbot-auto.
a2enmod ssl ./certbot-auto
After doing this, everything worked as expected.