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RHCSA Study Questions With Accurate Solutions
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RHCSA Study Questions With Accurate Solutions
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RHCSA Study Questions With Accurate SolutionsList the order of the layers involved in the LVM architecture Right Ans - 1.
Physical Volume(PV)
2. Volume Group(VG)
3. Logical Volume(LV)
What do you need to do before you create a physical volume? Right Ans -
You need to create a partition marked as the LVM partition type. In fdisk or
gdisk you need to press t to change the partition type. MBR disk is 8e, GUID is
8300
What command verifies the physical volumes that were created? Right Ans
- pvs
What command shows details about the physical volume? Right Ans -
pvdisplay
What command gives a hierarchical overview of which disks and partitions
are in the LVM volume groups and logical volumes? Right Ans - lsblk
How do you create a volume of the first partition of the the sdb disk? You want
to call the volume vgdata. Right Ans - vgcreate vgdata /dev/sdb1
Give the two commands that will allow you to see the volume group Right
Ans - vgs - Shows a summary of available volume groups
vgdisplay - Shows a detailed list of volume groups and their properties
Show the command you would use to create a logical volume of half the
physical volume vgdata. Name the logical volume lvvol01 Right Ans -
lvcreate -n lvvol01 -l 50%FREE vgdata
Show the command you would use to remove the logical volume lvvol01. That
logical volume resides in the physical volume vgdata. Right Ans -
lvremove /dev/vgdata/lvvol01
Show the command you would use to create a logical volume of 500 megabyte
in the physical volume vgdata. Name the logical volume lvvol01 Right Ans -
lvcreate -n lvvol01 -L 500M vgdata
,Show the commands you would use to show the logical volumes Right Ans
- lvs - Shows a summary of all available logical volumes
lvdisplay - Shows a detailed list of available logical volumes and their
properties
What would the name of the LV called lvvol01 in the Physical Volume vgdata
be called the the device mapper name? Right Ans - /dev/mapper/vgdata-
lvvol01
If you want to make an XFS file system out of the logical volume lvvol01 in the
PV vgdata, what is the command? Right Ans - mkfs.xfs
/dev/vgdata/lvvol01
If you want to make an EXT4 file system out of the logical volume lvvol01 in
the PV vgdata, what is the command? Right Ans - mkfs.ext4
/dev/vgdata/lvvol01
What file systems can only be increased and what file systems can be
increased and reduced? Right Ans - XFS - can only be increased
EXT4 - can be increased and decreased
Btrfs - can be increased and decreased
If you are going to reduce an EXT4 file system, what state must it be in?
Right Ans - You can only reduce the volume when it is offline
I want to add 250 megabytes to the file system /dev/vgdata/lvvol01. Show
the command Right Ans - lvresize -L +250M -r /dev/vgdata/lvvol01
I want to reduce the EXT4 file system by 250 megabytes. The LV is lvvol01, VG
is vgdata and the mount point is /files Right Ans - 1. umount /files
2. lvreduce -L -250M -r /dev/vgdata/lvvol01
I want to resize the LV to 75 percent of the Volume group. The LV is lvvol01,
VG is vgdata and the mount point is /files Right Ans - lvresize -r -l
75%VG /dev/vgdata/lvvol01
,I want to reduce the logical volume to 750 MB. LV is lvvol01 and VG is vgdata.
Show the command you would use Right Ans - lvreduce -r -l 750M
/dev/vgdata/lvvol01
I want to remove the physical volume /dev/sdb2 out of the volume group
vgdata, show the command you would use Right Ans - vgredeuce vgdata
/dev/sdb2
Which command shows the current version of RHEL you are using?
a. uname -r
b. cat /proc/rhel-version
c. cat /etc/redhat-release
d. uname -k Right Ans - C
[root@client ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
Which command enables you to find the actual version of the kernel that is
used?
a. uname -r
b. uname -v
c. procinfo -k
d. procinfo -l Right Ans - A
[root@client ~]# uname -r
3.10.0-957.12.2.el7.x86_64
What is the name of the process that helps the kernel initializing hardware
devices properly?
a. systemd-udevd
b. hwinit
c. udev
d. udevd Right Ans -
Where does your system find the default rules that are used for initializing
new hardware devices?
a. /etc/udev/rules.d
b. /usr/lib/udev/rules.d
c. /usr/lib/udev.d/rules
d. /etc/udev.d/rules Right Ans - A
, /etc/udev/rules.d
Which command should you use to unload a kernel module, including all of
its dependencies?
a. rmmod
b. insmod -r
c. modprobe -r
d. modprobe Right Ans - c
modprobe -r
Which command enables you to see whether the appropriate kernel modules
have been loaded for hardware in your server?
a. lsmod
b. modprobe -l
c. lspci -k
d. lspci Right Ans -
Where do you specify a kernel module parameter to make it persistent?
a. /etc/modules.conf
b. /etc/modprobe.conf
c. /etc/modprobe.d/somefilename
d. /usr/lib/modprobe.d/somefilename Right Ans -
Which statements about updating the kernel is not true?
a. The yum update kernel command will install a new kernel and not
update it.
b. The yum install kernel command will install a new kernel and keep the
old kernel.
c. The kernel package should be set as a yum protected package to ensure
that after an update the old kernel is still available.
d. After you have installed a new kernel version, you must run the
grub2-mkconfig command to modify the GRUB 2 boot menu so that is
shows the old kernel and the newly installed kernel.
Fr Right Ans -
What is a tainted kernel? Right Ans - A tainted kernel is a kernel that
contains closed source drivers.
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