Updated Server Diagnostics Troubleshooting (markdown)

Server-Diagnostics---Troubleshooting.md

@@ -25,6 +25,18 @@ Background: "radicale" do not support a nested storage hierachy.
 
 Solution: check for any folder in <NAME> which itself is a collection and move it on same level as $NAME. Check also content of related ".Radicale.props" file
 
+# Verification of start
+
+## started by systemd
+
+- terminal#1 / watch logs: `journalctl -f -u radicale`
+- terminal#2 / start "radicale" service: `systemctl start radicale`
+
+## Manual start
+
+- become "radicale" user: `su - -s /bin/bash radicale`
+- start "radicale" (here with log-level debug): `/usr/bin/radicale --logging-level debug`
+
 # Listen Status
 
 ## Radicale started, it's listen on configured IP/ports