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linux:systemd [2016/09/07 07:36] – [tricks] niziaklinux:systemd [2024/02/09 19:24] (current) – niziak
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 +====== systemd ======
 +
 +  * [[https://www.freedesktop.org/software/systemd/man/latest/bootup.html|bootup — System bootup process]]
 +
 ===== 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
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 </code> </code>
  
 +<code bash>
 +systemd-cgtop
 +</code>
  
 ==== emergency mode  ==== ==== emergency mode  ====
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 === 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
-</code>+</file>
  
 === udev === === udev ===
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 </code> </code>
 And now device is visible from systemd: And now device is visible from systemd:
-<code>+<code bash>
 systemctl -l -a systemctl -l -a
   dev-input-event0.device                                                                        loaded    active   plugged   /dev/input/event0   dev-input-event0.device                                                                        loaded    active   plugged   /dev/input/event0
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 You can create refer to device, e.g. create .wants directory You can create refer to device, e.g. create .wants directory
 <code>/etc/systemd/system/ev-input-lcd_sandwich_touchscreen.device.wants</code> <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 === === do not mount crypted volumes ===
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 /MyMountPoint /dev/vg_MyName/lv_MyName none luks,noauto,noearly /MyMountPoint /dev/vg_MyName/lv_MyName none luks,noauto,noearly
 </file> </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>
 +
 +====== Issues ======
 +
 +===== init.d services not started =====
 +
 +<code>
 +systemd-sysv-generator[320]: stat() failed on /etc/init.d/traccar, ignoring: No such file or directory
 +systemd-sysv-generator[320]: stat() failed on /etc/init.d/ts3server, ignoring: No such file or directory
 +systemd-sysv-generator[320]: stat() failed on /etc/init.d/miio_server, ignoring: No such file or directory
 +</code>
 +
 +Reason is that some init scripts are symlinked to files located in **/opt** directory, which is a different FS (in this case BTRFS subvolume), and it was not mounted when **systemd-sysv-generator** was started.
 +
 +**Solution:**
 +[[https://access.redhat.com/solutions/3094591|How to mount non-root filesystem before systemd-sysv-generator runs?]]
 +
 +> Under systemd-enabled systems, there's a new-with-systemd mount-option you can place in ''/etc/fstab'' — **x-initrd.mount**. 
 +> You also need to make sure that your filesystem's fs_passno is set to "0" ...and if your filesystem lives on an LVM2 volume, you need to update your GRUB2 config to ensure that the LVM gets onlined prior to systemd invoking the systemd-sysv-generator utility
 +
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