CF11-setup error page for database not available

A possible solution:

1) Make sure your Application.cfc file implements the onError eventhandler.

2) Include code in the onError handler to check whether datasources are available. For example, to check whether a datasource, myDSN, is available, you could do something like 

<cffunction name="onError">
<cfargument name="Exception" required=true >
<cfargument name = "EventName" type="String" required=true >

	<!--- Login into Coldfusion Administrator. --->
	<cfset  createObject("component","cfide.adminapi.administrator").login("my_CFAdmin_password")>
	
	<!--- Instantiate the data source object. --->
	<cfset  var datasourceObject = createObject("component","cfide.adminapi.datasource")>
	 
	<!--- Get a structure containing all the data sources --->
	<cfset var datasources = datasourceObject.getDatasources()>
	 
	<cfif structCount(datasources) eq 0 or not structKeyExists(datasources, 'myDSN')>
		Sorry, the data source in unavailable.
	</cfif>

</cffunction>