Red Hat Red Hat Certifications EX200 Questions & Answers

• Question 91:

  Copy /etc/fstab document to /var/TMP directory. According the following requirements to configure the permission of this document.

  The owner of this document must be root.

  This document belongs to root group.

  User mary have read and write permissions for this document.

  User alice have read and execute permissions for this document.

  Create user named bob, set uid is 1000. Bob have read and write permissions for this document.

  All users has read permission for this document in the system.

  Correct Answer: Check the anser in explanation.

  cp /etc/fstab /var/tmp chown root:root /var/tmp/fstab chmod a-x /var/tmp/fstab setfacl –m u:mary:rw /var/tmp/fstab setfacl –m u:alice:rx /var/tmp/fstab useradd –u 1000 bob

• Question 92:

  Search files.

  Find out files owned by jack, and copy them to directory /root/findresults

  Correct Answer: Check the anser in explanation.

  mkdir/root/findfiles find / -user jack -exec cp -a {} /root/findfiles/ \; ls /root/findresults

• Question 93:

  There is a local logical volumes in your system, named with common and belong to VGSRV volume group, mount to the /common directory. The definition of size is 128 MB.

  Requirement:

  Extend the logical volume to 190 MB without any loss of data. The size is allowed between 160-160 MB after extending.

  Correct Answer: Check the anser in explanation.

  lvextend -L 190M /dev/mapper/vgsrv-common resize2fs /dev/mapper/vgsrv-common

• Question 94:

  One Logical Volume named /dev/test0/testvolume1 is created. The initial Size of that disk is 100MB now you required more 200MB. Increase the size of Logical Volume, size should be increase on online.

  Correct Answer: Check the anser in explanation.

  lvextend -L+200M /dev/test0/testvolume1 Use lvdisplay /dev/test0/testvolume1)

  ext2online -d /dev/test0/testvolume1

  lvextend command is used the increase the size of Logical Volume. Other command lvresize command also here to resize. And to bring increased size on online we use the ext2online command.

• Question 95:

  Make a swap partition having 100MB. Make Automatically Usable at System Boot Time.

  Correct Answer: Check the anser in explanation.

  Use fdisk /dev/hda ->To create new partition.

  Type n-> For New partition

  It will ask for Logical or Primary Partitions. Press l for logical.

  It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.

  Type the Size: +100M ->You can Specify either Last cylinder of Size here.

  Press P to verify the partitions lists and remember the partitions name. Default System ID is 83 that

  means Linux Native.

  Type t to change the System ID of partition.

  Type Partition Number

  Type 82 that means Linux Swap.

  Press w to write on partitions table.

  Either Reboot or use partprobe command.

  mkswap /dev/hda? ->To create Swap File system on partition.

  swapon /dev/hda? ->To enable the Swap space from partition.

  free -m ->Verify Either Swap is enabled or not.

  vi /etc/fstab/dev/hda? swap swap defaults 0 0

  Reboot the System and verify that swap is automatically enabled or not.

• Question 96:

  One Logical Volume named lv1 is created under vg0. The Initial Size of that Logical Volume is 100MB. Now you required the size 500MB. Make successfully the size of that Logical Volume 500M without losing any data. As well as size should be increased online.

  Correct Answer: Check the anser in explanation.

  The LVM system organizes hard disks into Logical Volume (LV) groups. Essentially, physical hard disk partitions (or possibly RAID arrays) are set up in a bunch of equal sized chunks known as Physical Extents (PE). As there are several

  other concepts associated with the LVM system, let's start with some basic definitions:

  Physical Volume (PV) is the standard partition that you add to the LVM mix. Normally, a physical volume is a standard primary or logical partition. It can also be a RAID array.

  Physical Extent (PE) is a chunk of disk space. Every PV is divided into a number of equal sized PEs. Every PE in a LV group is the same size. Different LV groups can have different sized PEs.

  Logical Extent (LE) is also a chunk of disk space. Every LE is mapped to a specific PE.

  Logical Volume (LV) is composed of a group of LEs. You can mount a file system such as /home and /var on an LV.

  Volume Group (VG) is composed of a group of LVs. It is the organizational group for LVM. Most of the commands that you'll use apply to a specific VG.

  Verify the size of Logical Volume: lvdisplay /dev/vg0/lv1

  Verify the Size on mounted directory: df -h or df -h mounted directory name

  Use: lvextend -L+400M /dev/vg0/lv1

  ext2online -d /dev/vg0/lv1 to bring extended size online.

  Again Verify using lvdisplay and df -h command.

• Question 97:

  One Logical Volume is created named as myvol under vo volume group and is mounted. The Initial Size of that Logical Volume is 400MB. Make successfully that the size of Logical Volume 200MB without losing any data. The size of logical volume 200MB to 210MB will be acceptable.

  Correct Answer: Check the anser in explanation.

  First check the size of Logical Volume: lvdisplay /dev/vo/myvol

  Make sure that the filesystem is in a consistent state before reducing: # fsck -f /dev/vo/myvol

  Now reduce the filesystem by 200MB. # resize2fs /dev/vo/myvol 200M

  It is now possible to reduce the logical volume. #lvreduce /dev/vo/myvol -L 200M

  Verify the Size of Logical Volume: lvdisplay /dev/vo/myvol

  Verify that the size comes in online or not: df -h

• Question 98:

  Create a collaborative directory/home/admins with the following characteristics:

  Group ownership of /home/admins is adminuser

  The directory should be readable, writable, and accessible to members of adminuser, but not to any other user.

  (It is understood that root has access to all files and directories on the system.)

  Files created in /home/admins automatically have group ownership set to the adminuser group.

  Correct Answer: Check the anser in explanation.

  mkdir /home/admins chgrp -R adminuser /home/admins chmodg+w /home/admins chmodg+s /home/admins

• Question 99:

  There is a local logical volumes in your system, named with shrink and belong to VGSRV volume group, mount to the /shrink directory. The definition of size is 320 MB.

  Requirement:

  Reduce the logical volume to 220 MB without any loss of data. The size is allowed between 200-260 MB after reducing.

  Correct Answer: Check the anser in explanation.

  cd;umount /shrink e2fsck -f /dev/mapper/vgsrv-shrink resize2fs /dev/mapper/vgsrv-shrink 220M lvreduce -L 220M /dev/mapper/vgsrv-shrink mount -a

• Question 100:

  Upgrade the kernel, start the new kernel by default. kernel download from this address: ftp://server1.domain10.example.com/pub/update/new.kernel

  Correct Answer: Check the anser in explanation.

  Download the new kernel file and then install it. [root@desktop8 Desktop]# ls kernel-2.6.32-71.7.1.el6.x86_64.rpm kernel-firmware-2.6.32-71.7.1.el6.noarch.rpm [root@desktop8 Desktop]# rpm -ivh kernel-* Preparing... ########################################### [100%] 1:kernel-firmware ########################################### [ 50%] 2:kernel ########################################### [100%] Verify the grub.conf file, whether use the new kernel as the default boot. [root@desktop8 Desktop]# cat /boot/grub/grub.conf default=0 title Red Hat Enterprise Linux Server (2.6.32-71.7.1.el6.x86_64) root (hd0,0) kernel /vmlinuz-2.6.32-71.7.1.el6.x86_64 ro root=/dev/mapper/vol0-root rd_LVM_LV=vol0/root rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet initrd /initramfs-2.6.32-71.7.1.el6.x86_64.img