chore: Add article about retrieving the list of default images for Im… (#2795)

* chore: Add article about retrieving the list of default images for Image Puller

Signed-off-by: Anatolii Bazko <abazko@redhat.com>

* fixup

Signed-off-by: Anatolii Bazko <abazko@redhat.com>

* Update modules/administration-guide/pages/installing-kubernetes-image-puller.adoc

Co-authored-by: Jana Vrbkova <jvrbkova@redhat.com>

* Update modules/administration-guide/pages/retrieving-default-list-of-images-for-kubernetes-image-puller.adoc

Co-authored-by: Jana Vrbkova <jvrbkova@redhat.com>

---------

Signed-off-by: Anatolii Bazko <abazko@redhat.com>
Co-authored-by: Jana Vrbkova <jvrbkova@redhat.com>

Author: tolusha

modules/administration-guide/nav.adoc

@@ -53,12 +53,15 @@
 *** xref:configuring-a-user-namespace.adoc[]
 *** xref:configuring-allowed-urls-for-cloud-development-environments.adoc[]
 ** xref:caching-images-for-faster-workspace-start.adoc[]
-*** xref:installing-image-puller-on-kubernetes-by-using-cli.adoc[]
-*** xref:installing-image-puller-on-openshift-using-cli.adoc[]
-*** xref:installing-image-puller-on-openshift-by-using-the-web-console.adoc[]
-*** xref:configuring-image-puller-to-pre-pull-default-che-images.adoc[]
-*** xref:configuring-image-puller-to-pre-pull-custom-images.adoc[]
-*** xref:configuring-image-puller-to-pre-pull-additional-images.adoc[]
+*** xref:installing-kubernetes-image-puller.adoc[]
+**** xref:installing-image-puller-on-kubernetes-by-using-cli.adoc[]
+**** xref:installing-image-puller-on-openshift-using-cli.adoc[]
+**** xref:installing-image-puller-on-openshift-by-using-the-web-console.adoc[]
+*** xref:configuring-kubernetes-image-puller.adoc[]
+**** xref:configuring-image-puller-to-pre-pull-default-che-images.adoc[]
+**** xref:configuring-image-puller-to-pre-pull-custom-images.adoc[]
+**** xref:configuring-image-puller-to-pre-pull-additional-images.adoc[]
+*** xref:retrieving-default-list-of-images-for-kubernetes-image-puller.adoc[]
 ** xref:configuring-observability.adoc[]
 **** xref:the-woopra-telemetry-plugin.adoc[]
 **** xref:creating-a-telemetry-plugin.adoc[]

modules/administration-guide/pages/caching-images-for-faster-workspace-start.adoc

@@ -1,4 +1,4 @@
-:_content-type: REFERENCE
+:_content-type: ASSEMBLY
 :description: Caching images for faster workspace start
 :keywords: administration-guide, caching-images-for-faster-workspace-start
 :navtitle: Caching images for faster workspace start
@@ -18,17 +18,8 @@ configured to pre-pull relevant {prod-short} workspace images on each node.
 These images would already be available when a {prod-short} workspace starts,
 therefore improving the workspace start time.
 
-* xref:installing-image-puller-on-kubernetes-by-using-cli.adoc[]
-
-* xref:installing-image-puller-on-openshift-by-using-the-web-console.adoc[]
-
-* xref:installing-image-puller-on-openshift-using-cli.adoc[]
-
-* xref:configuring-image-puller-to-pre-pull-default-che-images.adoc[]
-
-* xref:configuring-image-puller-to-pre-pull-custom-images.adoc[]
-
-* xref:configuring-image-puller-to-pre-pull-additional-images.adoc[]
+include::partial$snip_installing-kubernetes-image-puller.adoc[]
+include::partial$snip_configuring-kubernetes-image-puller.adoc[]
 
 .Additional resources
 

modules/administration-guide/pages/configuring-image-puller-to-pre-pull-default-che-images.adoc

@@ -37,4 +37,8 @@ on {prod-short} upgrade.
                 }
               }
             }'
-----
+----
+
+.Additional resources
+
+* xref:retrieving-default-list-of-images-for-kubernetes-image-puller.adoc[]

modules/administration-guide/pages/configuring-kubernetes-image-puller.adoc

@@ -0,0 +1,15 @@
+:_content-type: PROCEDURE
+:description: Configuring {image-puller-name}
+:keywords: overview, configuring, image-puller
+:navtitle: Configuring {image-puller-name}
+
+[id="configuring-{image-puller-name}"]
+= Configuring {image-puller-name}
+
+This section contains instructions for configuring the {image-puller-name} for different use cases.
+
+== Configuring {image-puller-name}
+
+* xref:configuring-image-puller-to-pre-pull-default-che-images.adoc[]
+* xref:configuring-image-puller-to-pre-pull-custom-images.adoc[]
+* xref:configuring-image-puller-to-pre-pull-additional-images.adoc[]

modules/administration-guide/pages/installing-kubernetes-image-puller.adoc

@@ -0,0 +1,15 @@
+:_content-type: PROCEDURE
+:description: Installing {image-puller-name}
+:keywords: overview, installing, image-puller
+:navtitle: Installing {image-puller-name}
+
+[id="installing-{image-puller-name}"]
+= Installing {image-puller-name}
+
+Follow the instructions below to install the {image-puller-name} for different use cases.
+
+== Installing {image-puller-name}
+
+* xref:installing-image-puller-on-kubernetes-by-using-cli.adoc[]
+* xref:installing-image-puller-on-openshift-by-using-the-web-console.adoc[]
+* xref:installing-image-puller-on-openshift-using-cli.adoc[]

modules/administration-guide/pages/retrieving-default-list-of-images-for-kubernetes-image-puller.adoc

@@ -0,0 +1,32 @@
+:_content-type: PROCEDURE
+:description: Retrieving the default list of images for {image-puller-name}
+:keywords: administration-guide, image-puller
+:navtitle: Retrieving the default list of images for {image-puller-name}
+
+[id="retrieving-default-list-of-images-for-kubernetes-image-puller"]
+= Retrieving the default list of images for {image-puller-name}
+
+Learn how to retrieve the default list of images used by {image-puller-name}. This can be helpful for administrators who want to review and configure {image-puller-name-short} to use only a subset of these images in advance.
+
+
+.Prerequisites
+
+* Your organization's instance of {prod-short} is installed and running on {kubernetes} cluster.
+
+* An active `{orch-cli}` session with administrative permissions to the destination {orch-name} cluster. See {orch-cli-link}.
+
+.Procedure
+
+. Find out the namespace where the {prod-short} Operator is deployed:
++
+[source,subs="+attributes"]
+----
+OPERATOR_NAMESPACE=$({orch-cli} get pods -l app.kubernetes.io/component={prod-operator} -o jsonpath={".items[0].metadata.namespace"} --all-namespaces)
+----
+
+. Find out the images that can be pre-pulled by the {image-puller-name-short}:
++
+[source,subs="+attributes"]
+----
+{orch-cli} exec -n $OPERATOR_NAMESPACE deploy/{prod-operator} -- cat /tmp/external_images.txt
+----

modules/administration-guide/partials/snip_configuring-kubernetes-image-puller.adoc

@@ -0,0 +1,8 @@
+:_content-type: SNIPPET
+
+.Configuring {image-puller-name}
+
+* xref:configuring-image-puller-to-pre-pull-default-che-images.adoc[]
+* xref:configuring-image-puller-to-pre-pull-custom-images.adoc[]
+* xref:configuring-image-puller-to-pre-pull-additional-images.adoc[]
+

modules/administration-guide/partials/snip_installing-kubernetes-image-puller.adoc

@@ -0,0 +1,8 @@
+:_content-type: SNIPPET
+
+.Installing {image-puller-name}
+
+* xref:installing-image-puller-on-kubernetes-by-using-cli.adoc[]
+* xref:installing-image-puller-on-openshift-by-using-the-web-console.adoc[]
+* xref:installing-image-puller-on-openshift-using-cli.adoc[]
+