Single Usermode RHEL7
This post describes how to enter single usermode for Redhat 7.
Modify Boot Settings
At the GRUB 2 type the “e” key to edit the current kernel line
Move the cursor down to the kernel line, this is the line starting with linux16.
On this line remove the rgdb and quiet flags
and then add the following
rd.break will break the boot sequence at an early stage before the system boots fully. enforcing=0 puts SELinux into permissive mode.
Once you have made the edits above press Ctrl+x to resume the boot process using the new flags.
The system will continue to boot and you should be dropped into a command prompt if you entered the flags correctly.
To edit the filesystem you have to remount it as read/write.
switch_root:/# mount -o remount,rw /sysroot
then chroot to the mounted partition
switch_root:/# chroot /sysroot
Now yo are free to make the modifications to your system, the example below shows you how to reset the root password which is a common reason to go into single user mode.
Change The Root password
sh-4.2# passwd root Changing password for user root. New passwd: mypassword Retype new password: mypassword passwd: all authentication token updated successfully. sh-4.2# exit exit switch_root:/# exit logout