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linux:systemd [2016/04/06 09:38] – niziaklinux:systemd [2017/05/22 14:22] – niziak
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 ===== HowTo ===== ===== HowTo =====
 ==== start / stop ==== ==== start / stop ====
 +Rerun all generators, reload all unit files and recreate dependency tree:
 <code bash> <code bash>
 systemctl daemon-reload systemctl daemon-reload
Line 23: Line 24:
 </code> </code>
  
 +<code bash>
 +systemd-cgtop
 +</code>
  
 ==== emergency mode  ==== ==== emergency mode  ====
Line 45: Line 49:
 <code>setenv bootargs ${bootargs} systemd.unit=emergency.target</code> <code>setenv bootargs ${bootargs} systemd.unit=emergency.target</code>
  
-=== Start service when MMC card is inserted ===+Enable debug console on tty9 
 +<code bash>systemctl enable debug-shell.service</code> 
 + 
 +==== Start service when MMC card is inserted ====
 Create directory "dev-mmcblk0.device.wants" and put symlink to service inside it. Create directory "dev-mmcblk0.device.wants" and put symlink to service inside it.
 List of devices: <code bash>systemctl --all --full -t device</code> List of devices: <code bash>systemctl --all --full -t device</code>
Line 123: Line 130:
  
 === Remove startup console clearing === === Remove startup console clearing ===
-<code> +<file | /etc/systemd/system/getty@tty1.service.d/noclear.conf>
-/etc/systemd/system/getty@tty1.service.d/noclear.conf+
  
 [Service] [Service]
 TTYVTDisallocate=no TTYVTDisallocate=no
 +</file>
 +
 +=== udev ===
 +In udev rules.d add TAG+="systemd":
 +<code>
 +SUBSYSTEM=="input", KERNEL=="event[0-9]*", ENV{ID_INPUT_TOUCHSCREEN}=="1", ATTRS{name}=="edt-ft53*", \
 +    SYMLINK+="input/lcd_sandwich_touchscreen input/touchscreen_edt", \
 +    TAG+="systemd", \
 +    OPTIONS+="link_priority=100"
 </code> </code>
 +And now device is visible from systemd:
 +<code bash>
 +systemctl -l -a
 +  dev-input-event0.device                                                                        loaded    active   plugged   /dev/input/event0
 +  dev-input-lcd_sandwich_touchscreen.device                                                      loaded    active   plugged   /dev/input/lcd_sandwich_touchscreen
 +</code>
 +You can create refer to device, e.g. create .wants directory
 +<code>/etc/systemd/system/ev-input-lcd_sandwich_touchscreen.device.wants</code>
  
 +=== udev: start service ===
 +To start service if device is inserted:
 +<file | mu.rule>
 +..., TAG+="systemd", ENV{SYSTEMD_WANTS}="netctl-auto@mywifi.service"
 +</file>
  
 +=== do not mount crypted volumes ===
 +After switching to systemd by command <code bash>apt-get install systemd-sysv</code>, new problem occurs: 
 +system boot stops and waits for password for encrypted partition (with user data - no needed to system start).
 +
 +To prevent automount of crypted volumes, additional parameters 'noauto' and 'noearly' must be added to /etc/crypttab:
 +<file | /etc/crypttab>
 +/MyMountPoint /dev/vg_MyName/lv_MyName none luks,noauto,noearly
 +</file>
 +
 +=== Debian: Set network service timeout ===
 +System startup can hang forever if there is no link on ethernet cable:
 +<code>[    **] A start job is running for LSB: Raise network interf...38s / no limit)</code>
 +To set timeout, add file:
 +<file | /etc/systemd/system/networking.service.d/reduce-timeout.conf>
 +[Service]
 +TimeoutStartSec=15
 +</file>