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Introduction:
Let’s Encrypt is a free, automated, and open certificate authority (CA), run for the public’s benefit. It is a service provided by the Internet Security Research Group (ISRG).
The key principles behind Let’s Encrypt are:
  • Free: Anyone who owns a domain name can use Let’s Encrypt to obtain a trusted certificate at zero cost.
  • Automatic: Software running on a web server can interact with Let’s Encrypt to painlessly obtain a certificate, securely configure it for use, and automatically take care of renewal.
  • Secure: Let’s Encrypt will serve as a platform for advancing TLS security best practices, both on the CA side and by helping site operators properly secure their servers.
  • Transparent: All certificates issued or revoked will be publicly recorded and available for anyone to inspect.
  • Open: The automatic issuance and renewal protocol will be published as an open standard that others can adopt.
  • Cooperative: Much like the underlying Internet protocols themselves, Let’s Encrypt is a joint effort to benefit the community, beyond the control of any one organization.
(Reference source: Let's Encrypt)
In this article, I will install Let’s Encrypt for Apache2 onUbuntu 18.04LTS. And setup SSL/TLS certificate to renew automatically.
We recommend creating new Apache virtual host files for each domain because it helps to avoid common error & conflicts in during installation




Prerequisites:
  1. One Ubuntu 18.04 LTS server that already installed Apache2. You can refer to the article as How to Install LAMP on Ubuntu 18.04 LTS.
  2. A fully registered domain name. This domain name has been configured DNS.
  3. Be sure that you have a virtual host file for your domain. This video tutorial will use /etc/apache2/sites-available/dan14.vn.conf as an example (dan14.vn – this is my domain name).
Please see the video tutorial details below to help you Install SSL Certificates on UBUNTU 18.04LTS:



So, to install SSL certificate on Ubuntu 18.04 LTS that there are 5 basic steps as follows:
  • Step 1 — Installing Certbot
  • Step 2 — Set Up the SSL Certificate
  • Step 3 — Allowing HTTPS Through the Firewall
  • Step 4 — Obtaining an SSL Certificate
  • Step 5 — Verifying Certbot Auto-Renewal

Conclusion:
In this tutorial, we already completed installing SSL certificate for Apache on Ubuntu 18.04 LTS. And this certificate - Let’s Encrypt will renew automatically.  If you have any questions, please comment below. We will discuss and give the best answer. Thank you everyone.

In addition, if you have any problems with your computer, please contact us directly through the QTitHow fanpage. We will try to help and answer you as soon as possible. Thank you!