Configuring SSL With Virtual Hosts under Apache and CentOS

Two https can be served in one IP. You just need to verify that the virtual host configuration works.

Are you sure that your virtualhost works? You can use this config in site-available.

<VirtualHost *:80>
    ServerName www.example.com
    ServerAlias example.com
    DocumentRoot /var/www/example.com/public_html
    ErrorLog /var/www/example.com/error.log
    CustomLog /var/www/example.com/requests.log combined
</VirtualHost>

<VirtualHost *:80>
    ServerName www.example2.com
    DocumentRoot /var/www/example2.com/public_html
    ServerAlias example2.com
    ErrorLog /var/www/example2.com/error.log
    CustomLog /var/www/example2.com/requests.log combined
</VirtualHost>

Follow the tutorial here

If you are sure about your virtual host configuration, then you can change the configuration like this:

<VirtualHost *:443>
    ServerName www.example.com
    ServerAlias example.com
    DocumentRoot /var/www/example.com/public_html
    ErrorLog /var/www/example.com/error.log
    CustomLog /var/www/example.com/requests.log combined
    SSLEngine on
    SSLCertificateFile /etc/apache2/ssl/example/apache.crt
    SSLCertificateKeyFile /etc/apache2/ssl/example/apache.key
</VirtualHost>

<VirtualHost *:443>
    ServerName www.example2.com
    DocumentRoot /var/www/example2.com/public_html
    ServerAlias example2.com
    ErrorLog /var/www/example2.com/error.log
    CustomLog /var/www/example2.com/requests.log combined
    SSLEngine on
    SSLCertificateFile /etc/apache2/ssl/example2/apache.crt
    SSLCertificateKeyFile /etc/apache2/ssl/example2/apache.key
</VirtualHost>

Maybe you can refer to this for the ssl tutorial.

And finally you can access your web like this
https://example.com
https://example2.com