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Use this tag for questions about the system startup sequence after the OS' kernel is loaded. Contrast with , which covers what happens before the kernel is loaded.

While the details vary greatly from OS to OS, the typical sequence goes like this:

  • The kernel initializes drivers and mounts the root partition.
  • The kernel runs the initialization program, which triggers subsequent stages.
  • Startup-time setup is performed, such as mounting filesystems other than root, configuring some hardware devices, bringing up the network, etc.
  • Services/Daemons are started for network services, logging and monitoring, etc.
  • Login prompts are shown on the console.
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