Add documentation on the pvAccess Server

src/site/sphinx/config.rst

@@ -83,4 +83,23 @@ The properties checked for setting a PV to be archived are ::
 To set the auto pause behaviour, configure the parameter :ref:`aa.auto_pause`. Set to pvStatus to pause on pvStatus=Inactive,
 and resume on pvStatus=Active. Set to archive to pause on archive_property_name not existing. Set to both to pause on pvStatus=Inactive and archive_property_name::
 
-    aa.auto_pause=pvStatus,archive
+    aa.auto_pause=pvStatus,archive
+
+
+EPICS PV Access Server
+----------------------
+
+ChannelFinder provides an EPICS PV Access Server to access the api through pvAccess.
+There are a number of options that can be set such EPICS_PVA_ADDR_LIST. To see the
+full list go to https://github.com/ControlSystemStudio/phoebus/blob/v4.7.3/core/pva/src/main/java/org/epics/pva/PVASettings.java
+
+Since it is common to run ChannelFinder inside a docker container which by default does not support IPv6 you may have
+error messages in the logs about launching the EPICS PV Access service. If you only wish to have the EPICS Service available on
+IPv4 you can set the environment variable
+
+    EPICS_PVAS_INTF_ADDR_LIST="0.0.0.0"
+
+Or to not have the EPICS PV Access Server listen, then:
+
+    EPICS_PVAS_INTF_ADDR_LIST="0.0.0.0"
+