docs: replace Longhorn with Rook Ceph

README.md

@@ -181,11 +181,6 @@ They can't capture all the project's features, but they are sufficient to get a
         <td><a href="https://grafana.com/oss/loki">Loki</a></td>
         <td>Log aggregation system</td>
     </tr>
-    <tr>
-        <td><img width="32" src="https://longhorn.io/img/logos/longhorn-icon-white.png"></td>
-        <td><a href="https://longhorn.io">Longhorn</a></td>
-        <td>Cloud native distributed block storage for Kubernetes</td>
-    </tr>
     <tr>
         <td><img width="32" src="https://avatars.githubusercontent.com/u/1412239?s=200&v=4"></td>
         <td><a href="https://www.nginx.com">NGINX</a></td>
@@ -206,6 +201,11 @@ They can't capture all the project's features, but they are sufficient to get a
         <td><a href="https://www.whitesourcesoftware.com/free-developer-tools/renovate">Renovate</a></td>
         <td>Automatically update dependencies</td>
     </tr>
+    <tr>
+        <td><img width="32" src="https://raw.githubusercontent.com/rook/artwork/master/logo/blue.svg"></td>
+        <td><a href="https://rook.io">Rook Ceph</a></td>
+        <td>Cloud-Native Storage for Kubernetes</td>
+    </tr>
     <tr>
         <td><img width="32" src="https://avatars.githubusercontent.com/u/84780935?s=200&v=4"></td>
         <td><a href="https://woodpecker-ci.org">Woodpecker CI</a></td>

docs/how-to-guides/single-node-cluster-adjustments.md

@@ -1,15 +1,45 @@
 # Single node cluster adjustments
 
+!!! danger
+
+    This is not officially supported and I don't regularly test it,
+    I highly recommend using multiple nodes.
+
+    Using a single node could lead to data loss unless your backup strategy is rock solid,
+    make sure you are **ABSOLUTELY CERTAIN** this is what you want.
+
 Update the following changes, then commit and push.
 
-## Reduce Longhorn replica count
+## Remove storage redundancy
 
-Set the `defaultClassReplicaCount` to 1:
+Set pod counts and number of data copies to `1`:
 
-```yaml title="system/longhorn-system/values.yaml" hl_lines="6"
---8<--
-system/longhorn-system/values.yaml
---8<--
+```yaml title="system/rook-ceph/values.yaml" hl_lines="4 6 11 12 18 22 25"
+rook-ceph-cluster:
+  cephClusterSpec:
+    mon:
+      count: 1
+    mgr:
+      count: 1
+  cephBlockPools:
+    - name: standard-rwo
+      spec:
+        replicated:
+          size: 1
+          requireSafeReplicaSize: false
+  cephFileSystems:
+    - name: standard-rwx
+      spec:
+        metadataPool:
+          replicated:
+            size: 1
+        dataPools:
+          - name: data0
+            replicated:
+              size: 1
+        metadataServer:
+          activeCount: 1
+          activeStandby: false
 ```
 
 ## Disable automatic upgrade

docs/how-to-guides/troubleshooting/longhorn.md

@@ -1,3 +0,0 @@
-# Longhorn
-
-TODO (PR welcomed)

docs/reference/architecture/overview.md

@@ -63,7 +63,7 @@ flowchart TD
 
   subgraph system[./system]
     nginx[NGINX]
-    longhorn[Longhorn]
+    rook-ceph[Rook Ceph]
     cert-manager
     external-dns[External DNS]
     cloudflared

mkdocs.yml

@@ -74,7 +74,6 @@ nav:
       - how-to-guides/troubleshooting/argocd.md
       - how-to-guides/troubleshooting/cert-manager.md
       - how-to-guides/troubleshooting/gitea.md
-      - how-to-guides/troubleshooting/longhorn.md
       - how-to-guides/troubleshooting/pxe-boot.md
   - Reference:
     - reference/index.md