Fix group on Hedgedoc uploads volume

Document migration on NFS to Longhorn

docs/longhorn.md

@@ -1,5 +1,36 @@
 # Longhorn notes
 
+## Migration from NFS to Longhorn
+
+1. Delete the workload, and delete the PVC and PVC using NFS.
+2. Create Longhorn volumes as described below.
+3. Copy NFS data from lewis.dmz to local disk.
+4. Spin up a temporary pod and mount the Longhorn volume(s) in it:
+   ```nix
+    {
+      pods.testje.spec = {
+        containers.testje = {
+          image = "nginx";
+  
+          volumeMounts = [
+            {
+              name = "uploads";
+              mountPath = "/hedgedoc/public/uploads";
+            }
+          ];
+        };
+  
+        volumes = {
+          uploads.persistentVolumeClaim.claimName = "hedgedoc-uploads";
+        };
+      };
+    }
+   ```
+5. Use `kubectl cp` to copy the data from the local disk to the pod.
+6. Delete the temporary pod.
+7. Create the workload with updated volume mounts.
+8. Delete the data from local disk.
+
 ## Creation of new Longhorn volumes
 
 While it seems handy to use a K8s StorageClass for Longhorn, we do *not* want to use that.

kubenix-modules/hedgedoc.nix

@@ -65,28 +65,16 @@
               uploads.persistentVolumeClaim.claimName = "hedgedoc-uploads";
               config.configMap.name = "hedgedoc-config";
             };
+
+            securityContext = {
+              fsGroup = 65534;
+              fsGroupChangePolicy = "OnRootMismatch";
+            };
           };
         };
       };
     };
 
-    # pods.testje.spec = {
-    #   containers.testje = {
-    #     image = "nginx";
-
-    #     volumeMounts = [
-    #       {
-    #         name = "uploads";
-    #         mountPath = "/hedgedoc/public/uploads";
-    #       }
-    #     ];
-    #   };
-
-    #   volumes = {
-    #     uploads.persistentVolumeClaim.claimName = "hedgedoc-uploads";
-    #   };
-    # };
-
     services.hedgedoc.spec = {
       selector.app = "hedgedoc";