Init System

Abstract

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• A Process (进程) that runs in the background
• Most important Process (进程) with Process IDentifier (PID) 1
• Manages the lifecycle of all services that run in the background
• Below shows a list of common init systems. Basically Systemd for Linux Kernel, Launchd for MacOS and busybox for for Embedded OS like OpenWRT

Something simpler

If you just want to run a task in the background after the user logs out, you can just run nohup <command> &, the standard output and standard error streams are redirected to a file named nohup.out in the current directory by default. But this doesn’t restart the service on failure or after a reboot etc.