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--- doc:appunti:linux:sa:systemd [2018/05/23 12:03] – [Timeout in attesa di un device] niccolo
+++ doc:appunti:linux:sa:systemd [2024/11/15 15:01] (current) – [Verifica dipendenze servizi] niccolo
@@ Line 152: / Line 152: @@
 </file>
+===== Verifica Servizi =====
+Alcuni comandi utili per **verificare il funzionamento** dei servizi gestiti da **systemd**.
+Mostra lo stato di tutti i **servizi** e di tutte le **unit**:
+<code>
+systemctl --all --full status
+</code>
+Mostra le **unit** //required// e //wanted// dalla unit specificata:
+<code>
+systemctl --all list-dependencies ntp.service
+</code>
+===== Verifica dipendenze servizi =====
+Generates textual **dependency graph** description in //dot// format:
+<code>
+systemd-analyze dot
+systemd-analyze dot 'dhcpcd.*'
+systemd-analyze dot dhcpcd.service
+</code>
+Prints an **SVG graphic** detailing **which system services have been started at what time**:
+<code>
+systemd-analyze plot > services-start-graph.svg
+</code>
+Shows units **required** and **wanted** by the specified units:
+<code>
+systemctl list-dependencies
+systemctl list-dependencies dhcpcd.service
+systemctl list-dependencies wpa_supplicant@..service
+</code>
+  * **[[https://serverfault.com/questions/617398/is-there-a-way-to-see-the-execution-tree-of-systemd|Is there a way to see the execution tree of systemd?]]**
+  * **[[https://www.freedesktop.org/software/systemd/man/latest/systemd.unit.html|systemd.unit — Unit configuration]]**
+  * **[[https://www.freedesktop.org/software/systemd/man/latest/systemd.slice.html|systemd.slice — Slice unit configuration]]**
+===== Alternativa allo script rc.local =====
+Come eseguire uno script all'avvio di un sisetma Systemd.
+Creare una unit Systemd **/etc/systemd/system/my-startup.service**:
+<file>
+# /etc/systemd/system/my-startup.service
+#
+# Service executed once the system has reached the multi-user status.
+#
+#  Type=oneshot         The unit is up after the main process exits.
+#  RemainAfterExit=yes  The service shall be considered active even
+#                       when all its processes exited.
+#
+# Eanble the service with:
+#   systemctl enable my-startup.service
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/local/sbin/my-startup-script
+[Install]
+WantedBy=multi-user.target
+</file>
+Abilitare la unit e predisporre lo script **/usr/local/sbin/my-startup-script**.
 ===== Riferimenti web =====