Linux › Section F · How user space starts › Topic F.1

Introduction to init

Once the kernel has finished setting up the hardware, it hands control to a single user-space program, init. Everything you later see running, from logging daemons to the login prompt, descends from that one process.

In this topic

  • Handing over to user space
  • What init is responsible for
  • How the kernel finds init
  • A family of init systems
  • Why sequential init fell short
  • What modern init systems changed
  • Identifying your init
  • Worked example: three machines
  • Worked example: an orphaned process
  • Common mistakes to avoid
  • Key takeaways

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