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How to install Let's Encrypt SSL certificates on ClearOS

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Official documentation and announcement: https://www.clearos.com/resources/documentation/clearos/content:en_us:7_ug_lets_encrypt
https://news.clear.co.com/lets-encrypt-app-live-in-the-clearos-marketplace/

Let's Encrypt is an open certificate authority that provides free SSL certificates. The app intelligently integrates the certificate lifecyle and management into Webconfig to be used by other services - Webconfig, website hosting, Openfire etc.

Install

From the Marketplace

Install from web interface (in the System section), like all the other apps.

Manually

yum install app-lets-encrypt

Create certificates

System > Security > Let's Encrypt > Add
Lets Encrypt ClearOS Add A Certificate

 The www is not automatically added
For websites, you may want to add a certificate with and without the www. Ex.:

Primary Domain: example.org
Other Domains: www.example.org

List certificates

System > Security > Let's Encrypt
Lets Encrypt ClearOS Dashboard

Assign a certificate to a website

Server > Web > Web Server > Add or Edit > Settings > Options > Digital Certificate
Lets Encrypt ClearOS Use Certificate For A Website

Replace the self-signed certificate for the ClearOS admin panel

System -> General Settings > Settings > SSL Certificate -> Edit -> Pick Let's Encrypt certificate
Lets Encrypt ClearOS Use Certificate For A Admin Panel

 If it doesn't take effect right away,
just use another browser (ex.: Firefox instead of Chrome)

Using Let's Encrypt certificates in other apps

It is quite easy to use Let's Encrypt certificates in other apps using the following document: https://www.clearos.com/resources/documentation/clearos/content:en_us:kb_howtos_using_letsencrypt_certificates_for_mail
Although primarily written for mail apps, the methodology should be easily extensible to other apps such as LDAP, the FTP server and OpenFire.