My collection of systemd unit files

vc-mounter.service / vc-mounter.rb

Mounts VeraCrypt volumes as a specified user (with sudo), runs fsck on them, and executes an optional per volume custom ruby script.

tmpfs-folders.service

A simple step towards read only root file system to save preciuos disk read/writes. Mounts /var/log and user homes directories on tmpfs. SETUP: create directory skeletons (see instructions in tmpfs-folders.sh)

spindown-disks.service

Spind down disks before shutdown

---

References

LINKS

• https://www.digitalocean.com/community/tutorials/systemd-essentials-working-with-services-units-and-the-journal
• https://www.google.it/?gws_rd=ssl#q=systemd%20how%20to%20create%20a%20service
• https://coreos.com/docs/launching-containers/launching/getting-started-with-systemd/

SETUP:

• ln -f /opt/systemd-units/name.service /lib/systemd/system/ - hard link it
• systemctl enable name.service
• systemctl daemon-reload - after some changes

REFERENCES:

• http://www.freedesktop.org/software/systemd/man/systemd.service.html
• http://www.freedesktop.org/software/systemd/man/systemd.unit.html
• http://www.freedesktop.org/software/systemd/man/systemd.special.html
• http://www.freedesktop.org/software/systemd/man/bootup.html

Note that DefaultDependencies = true implies:

• Requires = sysinit.target
• After = sysinit.target basic.target
• Conflicts = shutdown.target
• Before = shutdown.target

EARLY START

[Unit]
DefaultDependencies = no
Requires  = sysinit.target local-fs.target
After     = sysinit.target local-fs.target
Before    = basic.target
[Install]
WantedBy  = basic.target

ONESHOTs: this combination stops the execution of both Start and Stop

Type = oneshot
RemainAfterExit = yes

DEBUG E LOGS:

• journalctl
• cat /var/log/boot.log
• graphs:
  • systemd-analyze plot > boot-chart.svg
  • systemd-analyze dot | dot -Tsvg > boot-full.svg
  • systemd-analyze --order dot | dot -Tsvg > boot-order.svg
  • systemd-analyze --require dot | dot -Tsvg > boot-require.svg