BZ1771435 gather data for restricted install

installing/install_config/installing-restricted-networks-preparations.adoc

@@ -49,6 +49,8 @@ In production environments, add the required images to a registry in your restri
 
 include::modules/installation-mirror-repository.adoc[leveloffset=+1]
 
+include::modules/installation-preparing-restricted-cluster-to-gather-support-data.adoc[leveloffset=+1]
+
 include::modules/installation-restricted-network-samples.adoc[leveloffset=+1]
 
 .Next steps

modules/installation-preparing-restricted-cluster-to-gather-support-data.adoc

@@ -0,0 +1,16 @@
+// Module included in the following assemblies:
+//
+// * installing/install_config/installing-restricted-networks-preparations.adoc
+
+[id="installation-preparing-restricted-cluster-to-gather-support-data_{context}"]
+= Preparing your cluster to gather support data
+
+Clusters using a restricted network must imporat the default must-gather image in order to gather debugging data for Red Hat support. The must-gather image is not imported by default, and clusters on a restricted network do not have access to the internet to pull the latest image from a remote repository.
+
+.Procedure
+
+. Import the default must-gather image from your installation payload:
++
+----
+$ oc import-image is/must-gather -n openshift
+----

modules/support-gather-data.adoc

@@ -28,6 +28,15 @@ $ oc adm must-gather
 ====
 If this command fails, for example if you cannot schedule a Pod on your cluster, then use the `oc adm inspect` command to gather information for particular resources. Contact Red Hat Support for the recommended resources to gather.
 ====
++
+[NOTE]
+====
+If your cluster is using a restricted network you must import the default must-gather image before running the `oc adm must-gather` command.
+
+----
+$ oc import-image is/must-gather -n openshift
+----
+====
 
 . Create a compressed file from the `must-gather` directory that was just created
 in your working directory. For example, on a computer that uses a Linux