doc/reference/applications/: Add listings for debug, incus-ceph, and incus-linstor applications

Signed-off-by: Mathias Gibbens <mathias.gibbens@futurfusion.io>

Author: gibmat

doc/reference/applications.md

@@ -7,9 +7,9 @@ The primary application is responsible for listening on the network and
 for handling user authentication. It then provides access to the IncusOS
 management API through its own API.
 
-IncusOS also supports additional (non-primary) applications which can
-extend the base system (for example for debugging) or provide additional
-features to another application.
+IncusOS also supports [additional](applications/non-primary.md) (non-primary)
+applications which can extend the base system (for example for debugging) or
+provide additional features to another application.
 
 ```{toctree}
 :maxdepth: 1
@@ -19,4 +19,6 @@ Migration Manager </reference/applications/migration-manager>
 Operations Center </reference/applications/operations-center>
 
 Shared API </reference/applications/shared-api>
+
+Non-primary applications </reference/applications/non-primary>
 ```

doc/reference/applications/debug.md

@@ -0,0 +1,14 @@
+# Debug
+
+The Debug application provides several additional tools that can be useful for developers working on debugging issues in an IncusOS system:
+
+* `htop`
+* `ifstat`
+* `iputils-ping`
+* `nano`
+* `mtr-tiny`
+* `net-tools`
+* `netcat-openbsd`
+* `procps`
+* `strace`
+* `tcpdump`

doc/reference/applications/incus-ceph.md

@@ -0,0 +1,3 @@
+# Incus Ceph
+
+The Incus Ceph (`incus-ceph`) application installs the Ceph client for Incus deployments needing to use [Ceph storage](../services/ceph.md).

doc/reference/applications/incus-linstor.md

@@ -0,0 +1,3 @@
+# Incus Linstor
+
+The Incus Linstor (`incus-linstor`) application installs Linstor satellite support for Incus deployments needing to use [Linstor storage](../services/linstor.md).

doc/reference/applications/incus.md

@@ -28,5 +28,5 @@ Important seed fields include:
 
 Two additional applications exist which extend the main Incus application:
 
-* `incus-ceph`: Adds Ceph client support
-* `incus-linstor`: Add Linstor satellite support
+* `incus-ceph`: Adds [Ceph](../services/ceph.md) client support
+* `incus-linstor`: Adds [Linstor](../services/linstor.md) satellite support

doc/reference/applications/non-primary.md

@@ -0,0 +1,11 @@
+# Non-primary applications
+
+IncusOS uses non-primary applications to enhance the functionality of a primary application or provide debugging support.
+
+```{toctree}
+:maxdepth: 1
+
+Debug </reference/applications/debug>
+Incus-Ceph </reference/applications/incus-ceph>
+Incus-Linstor </reference/applications/incus-linstor>
+```