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cmdline.md

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Tips & Tricks with the kernel cmdline

This document summarizes the different boot parameters that can be passed on the Linux kernel command line. Not limited to Finit.

  • debug__ Enable kernel debug. Debug messages are printed to the console until Finit starts up, the syslog daemon then empties /dev/kmsg

  • init=/bin/sh
    Bypass system default init and tell kernel to start a shell. Note, this shell is very limited and does not support signals and has no job control. Recommend using, and modifying, rescue mode instead.

  • panic=SEC
    By default the kernel does not reboot after a kernel panic. This setting will cause a kernel reboot after SEC seconds.

  • quiet
    Suppress kernel logging to console, except for warnings and errors.

  • rescue
    Start Finit rescue mode; no network, no fsck of file systems in /etc/fstab, no /etc/rc.local, no runparts. The configuration is read from /etc/rescue.conf, can be modified by the operator.

  • single, or S
    Single user mode, runlevel 1, in Finit. Useful to debug problems with the regular runlevel. All services and TTYs in [1] will be started, so a tty [1] @console nologin configuration presents you with a root console without login.

For more on kernel boot paramaters, see the man page bootparam(7).