[5061] User's Guide updated.

doc/Makefile.am

@@ -10,6 +10,7 @@ nobase_dist_doc_DATA  = examples/ddns/sample1.json
 nobase_dist_doc_DATA += examples/ddns/template.json
 nobase_dist_doc_DATA += examples/kea4/advanced.json
 nobase_dist_doc_DATA += examples/kea4/backends.json
+nobase_dist_doc_DATA += examples/kea4/cassandra.json
 nobase_dist_doc_DATA += examples/kea4/classify.json
 nobase_dist_doc_DATA += examples/kea4/dhcpv4-over-dhcpv6.json
 nobase_dist_doc_DATA += examples/kea4/hooks.json
@@ -23,6 +24,7 @@ nobase_dist_doc_DATA += examples/kea4/single-subnet.json
 nobase_dist_doc_DATA += examples/kea4/with-ddns.json
 nobase_dist_doc_DATA += examples/kea6/advanced.json
 nobase_dist_doc_DATA += examples/kea6/backends.json
+nobase_dist_doc_DATA += examples/kea6/cassandra.json
 nobase_dist_doc_DATA += examples/kea6/classify.json
 nobase_dist_doc_DATA += examples/kea6/dhcpv4-over-dhcpv6.json
 nobase_dist_doc_DATA += examples/kea6/duid.json

doc/guide/dhcp4-srv.xml

@@ -447,6 +447,11 @@ be followed by a comma and another object definition.</para>
   the DHCPv4 server.  In this case, set the value to the empty string:
 <screen>
 "Dhcp4": { "lease-database": { <userinput>"host" : ""</userinput>, ... }, ... }
+</screen>
+  Should the database use a port different than standard, it may be
+  specified as well:
+<screen>
+"Dhcp4": { "lease-database": { <userinput>"port" : 12345</userinput>, ... }, ... }
 </screen>
   Should the database be located on a different system, you may need to specify a longer interval
   for the connection timeout:
@@ -456,6 +461,17 @@ be followed by a comma and another object definition.</para>
 The default value of five seconds should be more than adequate for local connections.
 If a timeout is given though, it should be an integer greater than zero.
   </para>
+
+  <para>
+    Note that host parameter is used by MySQL and PostgreSQL
+    backends. Cassandra has a concept of contact points that could be
+    used to contact the cluster, instead of a single IP or
+    hostname. It takes a list of comma separated IP addresses. This may be specified as:
+<screen>
+"Dhcp4": { "lease-database": { <userinput>"contact-points" : "192.0.2.1,192.0.2.2"</userinput>, ... }, ... }
+</screen>
+  </para>
+
   <para>Finally, the credentials of the account under which the server will
   access the database should be set:
 <screen>
@@ -515,6 +531,12 @@ If a timeout is given though, it should be an integer greater than zero.
 <screen>
 "Dhcp4": { "hosts-database": { <userinput>"host" : ""</userinput>, ... }, ... }
 </screen>
+  Should the database use a port different than standard, it may be
+  specified as well:
+<screen>
+"Dhcp4": { "hosts-database": { <userinput>"port" : 12345</userinput>, ... }, ... }
+</screen>
+
   </para>
   <para>Finally, the credentials of the account under which the server will
   access the database should be set:

doc/guide/dhcp6-srv.xml

@@ -442,6 +442,11 @@ be followed by a comma and another object definition.</para>
   the DHCPv6 server.  In this case, set the value to the empty string:
 <screen>
 "Dhcp6": { "lease-database": { <userinput>"host" : ""</userinput>, ... }, ... }
+</screen>
+  Should the database use a port different than standard, it may be
+  specified as well:
+<screen>
+"Dhcp4": { "lease-database": { <userinput>"port" : 12345</userinput>, ... }, ... }
 </screen>
   Should the database be located on a different system, you may need to specify a longer interval
   for the connection timeout:
@@ -451,6 +456,17 @@ be followed by a comma and another object definition.</para>
 The default value of five seconds should be more than adequate for local connections.
 If a timeout is given though, it should be an integer greater than zero.
   </para>
+
+  <para>
+    Note that host parameter is used by MySQL and PostgreSQL
+    backends. Cassandra has a concept of contact points that could be
+    used to contact the cluster, instead of a single IP or
+    hostname. It takes a list of comma separated IP addresses. This may be specified as:
+<screen>
+"Dhcp4": { "lease-database": { <userinput>"contact-points" : "192.0.2.1,192.0.2.2"</userinput>, ... }, ... }
+</screen>
+  </para>
+
   <para>Finally, the credentials of the account under which the server will
   access the database should be set:
 <screen>
@@ -509,6 +525,9 @@ If a timeout is given though, it should be an integer greater than zero.
   the DHCPv6 server.  In this case, set the value to the empty string:
 <screen>
 "Dhcp6": { "hosts-database": { <userinput>"host" : ""</userinput>, ... }, ... }
+</screen>
+<screen>
+"Dhcp4": { "hosts-database": { <userinput>"port" : 12345</userinput>, ... }, ... }
 </screen>
   </para>
   <para>Finally, the credentials of the account under which the server will