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22 Cards in this Set
- Front
- Back
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What does RHEL MBR contains to boot the system?
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grub boot loader
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GRUB boot loader config file locations
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/etc/grub.conf or /boot/grub/grub.conf
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How to boot into Rescue Mode
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a) boot RHEL installation CD b) at installation boot prompt type: linux rescue
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How to boot into Rescue Mode with third-party driver support?
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linux rescue dd
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How do you prvent a RHEL driver from loading if it causes a problem?
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Blacklist that driiver from loading with: linux rescue rdblacklist=driver_name
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How to permanently disable a driver from loading at startup?
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add rdblacklist=driver_name to /boot/grub/grub.conf file
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Steps to restore GRUB bootloader on MBR
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a) boot linux rescue mode b) chroot /mnt/sysimage to mount root partition c) grub-install /dev/sda d) modify grub.conf file if necessary
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How to enter single user mode?
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At boot type: init 1 or single
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What is the difference between emergency mode and single user mode?
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Emergency mode boot into the most minimal environment. Root file system is loaded as read only and no INIT scripts are loaded
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How to boot into emergency mode?
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at boot prompt, type: emergency
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How to uinstall a driver in rescue mode?
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a) boot into rescue mode b) chroot /mnt/sysimage c) rpm -e driver_name
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How to do in-place upgrade of RHE systems?
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a) boot install CD b) type: linux upgradeany
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What can be used to capture dump file when system crashes?
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kdump
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What can be used to analyze vmcore dump file generated from kdump tool?
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crash
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How to configure order in which domain name is resolved?
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/etc/nsswitch.conf
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How to restrict resource usage for users such as memory and cpu time?
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/etc/security/limits.conf
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How to convert ext2 partition to ext3 partition without data loss?
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tune2fs -j
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ntp configuration file
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/etc/ntp.conf
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time zone configuration file
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/etc/sysconfig/clock
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Utility to change services start-up options for desired runlevels (eg 3 and 5). Similar to Windows services.msc
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ntsysv --level 35
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How to check what services/user is using what process/files/dir/mount points/ports etc..?
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fuser -v
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How to kill all process that is using a filename?
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fuser -k filename
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