Apache 2 is a well know server for linux.Setting up an SSL certificate on it is very simple and straightforward.
Firstly we need an SSL certificate,We can get it from numerous online SSL providers or we could generate one ourself.
To generate a 2048 bit key.
sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/apache2/ssl/apache.key -out /etc/apache2/ssl/apache.crt
This will create your public ssl certificate and a private key.
Next we have to enable ssl module for apache2
sudo a2enmod ssl
Once have this enabled,Lets add the certificate to all of the websites running on the server.On apache2 you can find the websites on /etc/apache2/sites-available/.Lets change the default-ssl.conf file on the /etc/apache2/sites-available/default-ssl.conf.
Just change a couple to lines in the file.
SSLEngine on SSLCertificateFile /etc/apache2/ssl/apache.crt SSLCertificateKeyFile /etc/apache2/ssl/apache.key
These configurations tell apache which certificate to use and which key goes along with it.All we have to do now is enable the configuration
sudo a2ensite default-ssl.conf
And then to restart the apache2 server
sudo service apache2 restart