Page 87 - RHEL8 BOOK

Trouble Shooting
 Recovering Root Password
 Password
Root Password can be recovered in a
 Specialized troubleshooting mode (i.e. init 1)
 init 1 level provides a shell (i.e. sh) without Logging in.

Procedure
 Restart the system
 In the splash screen Select RedHat Enterprise Linux
 Press e
 Select Kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/rhgb quiet
 Press e to edit
 Edit Kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/rhgb quiet 1
 Press Enter
 Press b to boot with the selected run level
 directly you will get shell prompt to assign the root password
 sh-3.00#passwd root

Assigning Grub Password
[root@comp1~]# grub-md5-crypt >> /boot/grub/grub.conf
[root@comp1~]# vi /boot/grub/grub.conf
hidden menu
password --md5 <password>
title Red Hat ------

Recovering Grub Password
Boot the System in Rescue Mode
#chroot /mnt/sysimage
# vi /boot/grub/grub.conf

Remove line from /boot/grub/grub.conf
hidden menu
password -- md5 <password>
title Red Hat ------
Other Configurations
To configure printer
[root@comp1~]# system-config-printer
To configure modem
[root@comp1~]# system-config-network-druid

To view the process
[root@comp1~]# ps –aux

To kill a specific process
[root@comp1~]# kill -9 <process id>

To view CPU usage by all process
[root@comp1~]# top

S. Pradhan
(MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
Email Id:-spradhan.iiht@gmail.com
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