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49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
Tips & Tricks with the kernel cmdline
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=====================================
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This document summarizes the different boot parameters that can be
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passed on the Linux kernel command line. Not limited to Finit.
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The `bool` setting is one of `on, off, true false, 1, 0`.
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* `debug`: Enable kernel debug. Debug messages are printed to the
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console until Finit starts up.
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* `finit.debug[=bool]`: Enable finit debug. This is operated
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independently of the kernel debug setting. New as of Finit v4.
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* `finit.show_status[=bool]`: Control finit boot progress, including
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banner.
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* `finit.status_style=<classic,modern>`: Set Finit boot progress style,
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when enabled.
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* `init=/bin/sh`: Bypass system default init and tell kernel to start a
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shell. Note, this shell is very limited and does not support
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signals and has no job control. Recommend using, and modifying,
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`rescue` mode instead.
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* `panic=SEC`: By default the kernel does not reboot after a kernel
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panic. This setting will cause a kernel reboot after SEC seconds.
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* `quiet`: Suppress kernel logging to console, except for warnings and
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errors.
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* `rescue`: Start rescue/maintenance mode. If your system comes with
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the bundled `sulogin` program (Finit, or from util-linux/Busybox),
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you will be given a root login to a maintenance shell. However, if
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`sulogin` is missing, the file `/lib/finit/rescue.conf` is read and
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the system booted in a limited fallback mode. See [config.md][]
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for more information.
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* `single`, or `S`: Single user mode, runlevel 1, in Finit. Useful to
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debug problems with the regular runlevel. All services and TTYs in
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`[1]` will be started, so a `tty [1] @console nologin` configuration
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presents you with a root console without login.
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For more on kernel boot paramaters, see the man page [bootparam(7)][].
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[config.md][]: config.md#rescue-mode
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[bootparam(7)]: https://www.man7.org/linux/man-pages/man7/bootparam.7.html
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