git howto trigger resync

git.mdwn

@@ -276,3 +276,19 @@ Access to push to this repository is controlled by the
 `gitolite-admin` repository entry in the gitolite configuration file,
 and not by LDAP groups.
 
+## Potential problems to solve
+
+### gitweb out of sync
+
+If vineale is down for an extended period of time, it's a good idea to trigger
+a re-sync of all the repositories to ensure that the latest version is available
+to clone from the anonymous endpoints.
+
+Create an empty commit in the gitolite-admin.git repository using:
+
+```
+git commit -m "trigger resync" --allow-empty
+```
+
+and push this commit. This will run through the post-commit hook that includes
+syncing everything.