[skip ci]

adopted content from 6.3. Setting the FQDN of [RHCS 10cc] for doc convergence.

docs/installation/others/FQDN_Configuration.adoc

@@ -7,23 +7,43 @@
 In order to have a properly functioning PKI system,
 each machine in the system must have a correct fully qualified domain name.
 
-This page describes the process to verify and configure
-the fully qualified domain name on each machine.
+This page describes the process to configure the fully qualified domain name on each machine.
 
 == Verifying FQDN ==
 
 To verify the current FQDN, execute the following command:
 
 ----
-$ python -c 'import socket; print(socket.getfqdn())'
+# hostname
 pki.example.com
 ----
 
 == Configuring FQDN ==
+If the host name is not what you expect it to be, run hostnamectl to set the hostname.  For example,
 
-To configure the FQDN, specify the FQDN in `/etc/hosts`, for example:
+set the hostname of your pki machine as follows:
 
 ----
-127.0.0.1 pki.example.com
-::1 pki.example.com
+# hostnamectl set-hostname pki.example.com
+----
+
+set the hostname of your DS machine as follows:
+
+----
+# hostnamectl set-hostname dir.example.com
+----
+
+Additionally, add both the CS and DS machines' IP addresses and new hostnames as entries in /etc/hosts of both machines: 
+
+----
+127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
+::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
+10.1.111.111 pki.example.com
+10.2.222.222 dir.example.com
+----
+
+Verify the FQDN again after the change:
+
+----
+# hostname
 ----