Installing​ ​an​ ​SSL​ ​Certificate​ ​on​ ​CentOS​ ​Running​ ​Apache(Let's Encrypt Project Instructions)
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You will:

• Start out by installing Apache with mod_ssl.
• From there, you’ll add firewall rules to allow HTTP and HTTPS traffic.
• Next, you’ll enable the EPEL repository by installing the epel-release package. That will enable you to install the Certbot application and the Apache Certbot plugin.
• You will then create and install an SSL certificate using the Certbot utility.
• Finally, you’ll automate the certificate renewal process so that your site is never without a valid SSL certificate.

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