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Controlling and Troubleshooting the Red Hat Enterprise Linux Boot Process
Controlling and Troubleshooting the Red Hat Enterprise Linux Boot Process
Selecting a Boot Target
systemctl get-default
systemctl isolate multi-user.target
systemctl set-default multi-user.target
reboot
->e->systemd.unit=rescue.target->Ctrl+x->redhat
systemctl set-default graphical.target
Resetting a Lost root Password
->e->linux16......rd.break->Ctrl+x
ls -l
mount -o remount,rw /sysroot
chroot /sysroot
echo root:redhat | chpasswd
touch /.autorelabel
->exit->exit
Repairing Boot Problems
->e->linux16......systemd.unit=emergency.target->Ctrl+x
mount -oremount,rw /
mount -a
vi /etc/fstab
->#RemoveMe
mount -a
Repairing a Boot Loader Problem
->e
->os16=>linux16
->Ctrl+x
grub2-Mkconfig > /boot/grub2/grub.cfg