RHEL Rescue Options

Runlevel 1

  • Process rc.sysinit and rc1.d scripts
  • / file system is mounted rw
  • network is not activated

Single-User Mode

  • Process only rc.sysinit
  • Append 1 or single at the end of the line for the kernel that you wish to boot / file system is mounted in rw
  • Local file systems are mounted and network disabled
  • Do not use single-user mode if your file system cannot be mounted successfully
  • You cannot use single-user mode if the runlevel 1 configuration on your system is corrupted

Emergency Mode

  • Run sulogin only
  • /etc/rc.d/rc.sysinit and /etc/rc1.d are not run
  • The root file system is mounted read-only
  • Append emergency at the end of the line for the kernel that you wish to boot
  • Use mount -o remount,rw / to edit the configuration files

Skip init

  • Append init=/bin/bash (RHEL 5-6) and rd.break or rw init=/sysroot/bin/sh (RHEL 7) to kernel command line at boot
  • If /sbin/init is corrupted
  • The root filesystem is read-only, use mount -o remount,rw / (RHEL 6) or mount -o remount,rw /sysroot (RHEL 7) for read-write
  • Check root filesystem
  • Reset root password