ajschmidt commented on a change in pull request #3534: TP Delivery Service 
Generate SSL update, new letsencrypt generate and…
URL: https://github.com/apache/trafficcontrol/pull/3534#discussion_r338647971
 
 

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 File path: docs/source/admin/traffic_router.rst
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 @@ -681,8 +681,67 @@ The ordering of certificates within the certificate 
bundle matters. It must be:
 
 To see the ordering of certificates you may have to manually split up your 
certificate chain and use :manpage:`openssl(1ssl)` on each individual 
certificate
 
-Suggested Way of Setting up an HTTPS Delivery Service
------------------------------------------------------
+Let's Encrypt
+-------------
+Let’s Encrypt is a free, automated :abbr:`CA (Certificate Authority)` using 
:abbr:`ACME (Automated Certificate Management Environment)` protocol. Let's 
Encrypt performs a domain validation before issuing or renewing a certificate. 
There are several options for domain validation but for this application the 
DNS challenge is used in order to receive wildcard certificates. Let's Encrypt 
sends a token to be used as a TXT record at 
``_acme-challenge.domain.example.com`` and after verifying that the token is 
accessible there, will return the newly generated and signed certificate and 
key. The basic workflow implemented is:
+
+#. ``POST`` to Let's Encrypt and receive the DNS challenge token.
+#. Traffic Ops stores the DNS challenge in the Traffic Ops database.
+#. Traffic Router has a watcher set up to watch for changes in the Traffic Ops 
database table.
 
 Review comment:
   I hate this wording where you keep saying 'database'. It sounds like TR is 
performing SQL queries on Postgres. I think its fine if you just say something 
like 'Traffic Ops stores the DNS challenge and then Traffic Router has a 
watcher which checks with Traffic Ops for any new challenges." I think you 
should fix all the references to 'database'. 

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