SysV vs Debian Insserv vs Upstart vs Systemd: Insserv

• Debian had an upstart like dependency specified boot, before everyone else with insserv and startpar.

• Before reboot, insserv will analyze specified dependencies between scripts, and rename initscripts as S10, some as S20, and so forth.

• Everything under S10 is started at the same time, and things in S20 won't start until all of S10xx has started.

• It's easy to visualize and review dependencies before reboot.

• We can freeze them in our image, and deploy everywhere

• Simple, and everything is the same => winner for us.