EX200 Online Practice Questions and Answers

Correct Answer: Check the anser in explanation.

# cd /opt/

# mkdir dir

# find / -user harry -exec cp -rfp {} /opt/dir/ \;

Correct Answer: Check the anser in explanation.

yum install -y autofs mkdir /home/rehome

/etc/auto.master /home/rehome/etc/auto.ldap Keep then exit cp /etc/auto.misc /etc/auto.ldap

/etc/auto.ldap ldapuserX -fstype=nfs,rw server.domain11.example.com:/home/guests/ Keep then exit systemctl start autofs systemctl enable autofs su - ldapuserX// test

If the above solutions cannot create files or the command prompt is -bash-4.2$, it maybe exist multi-level directory, this needs to change the server.domain11.example.com:/home/guests/ to server.domain11.example.com:/home/guests/ ldapuserX. What is multi-level directory? It means there is a directory of ldapuserX under the /home/guests/ldapuserX in the questions. This directory is the real directory.

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fdisk -cu /dev/vda// Create a 1G partition, modified when needed partx –a /dev/vda pvcreate /dev/vdax vgcreate datastore /dev/vdax –s 16M lvcreate– l 50 –n database datastore mkfs.ext3 /dev/datastore/database mkdir /mnt/database mount /dev/datastore/database /mnt/database/ df –Th vi /etc/fstab /dev/datastore /database /mnt/database/ ext3 defaults 0 0 mount –a Restart and check all the questions requirements.

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(1)find /etc -size 10k -exec cp {} /tmp/findfiles \;

(2)find / -user lucy -exec cp -a {} /tmp/findfiles \;

Note: If find users and permissions, you need to use cp - a options, to keep file permissions and user attributes etc.

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# pvcreate /dev/sda7 /dev/sda8 # vgcreate -s 16M vg1 /dev/sda7 /dev/sda8 # lvcreate -l 50 -n lvm02 # mkfs.ext4 /dev/vg1/lvm02 # blkid /dev/vg1/lv1 # vim /etc/fstab # mkdir -p /mnt/data UUID=xxxxxxxx /mnt/data ext4 defaults 0 0 # vim /etc/fstab # mount -a # mount (Verify)

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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.

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yum -y install sssd authconfig-gtk krb5-workstation authconfig-gtk // open the graphical interface Modify user account database to ldap, fill up DN and LDAP SERVER as questions required, use TLS to encrypt connections making tick, write http://server.domain11.example.com/pub/EXAMPLE-CA-CERT to download ca, authentication method choose ldap password. You can test if the ldapuser is added by the following command: Id ldapuser1 Note: user password doesn't not need to set

Correct Answer: Check the anser in explanation.

use the authconfig --nisserver= --nisdomain= -- update

Example: authconfig --niserver=192.168.0.254 --nisdomain=RHCE --update or system-config-authentication

Click on Enable NIS

Type the NIS Domain: RHCE

Type Server 192.168.0.254 then click on next and ok

You will get a ok message.

Create a Directory /rhome/stationx where x is your station number.

vi /etc/auto.master and write at the end of file /rhome/stationx /etc/auto.home --timeout=60

vi /etc/auto.home and write

* -rw,soft,intr 192.168.0.254:/rhome/stationx/and

Note: please specify your station number in the place of x.

Service autofs restart

Login as the nisuser2001 or nisuser2002 on another terminal will be Success. According to question, RHCE domain is already configured. We have to make a client of RHCE domain and automatically mount the home directory on your

system. To make a member of domain, we use the authconfig with option or system-config authentication command. There a are lots of authentication server i.e NIS, LDAB, SMB etc. NIS is a RPC related Services, no need to configure

the DNS, we should specify the NIS server address.

Here Automount feature is available. When user tried to login, home directory will automatically mount. The automount service used the /etc/auto.master file. On /etc/auto.master file we specified the mount point the configuration file for mount point.

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*

1.

Reboot the server pressing by Ctrl+Alt+Del

2.

When the boot-loader menu appears, press the cursor keys to highlight the default boot- loader entry

3.

Press e to edit the current entry.

4.

Use the cursor keys to navigate to the line that starts with linux.

5.

Press End to move the cursor to the end of the line.

6.

Append rd.break to the end of the line.

7.

Press Ctrl+x to boot using the modified configuration.

8.

At the switch_root prompt

*

switch_root:/# mount -o remount,rw /sysroot

switch_root:/# chroot /sysroot

sh-4.4# echo kexdrams | passwd --stdin root

Changing password for user root.

passwd: all authentication tokens updated successfully.

sh-4.4# touch /.autorelabel

sh-4.4# exit; exit

*

Type exit twice to continue booting your system as usual.

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* [root@node2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vdd 252:48 0 5G 0 disk vde 252:64 0 10G 0 disk [root@node2 ~]# yum install kmod-kvdo vdo [root@node2 ~]# systemctl enable --now vdo [root@node2 ~]# systemctl start vdo [root@node2 ~]# systemctl status vdo [root@node2 ~]# vdo create --name=vdo1 --device=/dev/vde --vdoLogicalSize=50G [root@node2 ~]# vdostats --hu Device Size Used Available Use% Space saving% /dev/mapper/vdo1 10.0G 4.0G 6.0G 40% N/A [root@node2 ~]# mkfs.xfs -K /dev/mapper/vdo1

* [root@node2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vde 252:64 0 10G 0 disk vdo1 253:4 0 50G 0 vdo [root@node2 ~]# mkdir /vbread [root@node2 ~]# blkid /dev/mapper/vdo1: UUID="1ec7a341-6051-4aed-8a2c-4d2d61833227" BLOCK_SIZE="4096" TYPE="xfs" [root@node2 ~]# vim /etc/fstab UUID=1ec7a341-6051-4aed-8a2c-4d2d61833227 /vbread xfs defaults,x- systemd.requires=vdo.service 0 0 [root@node2 ~]# mount /dev/mapper/vdo1 /vbread/ [root@node2 ~]# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/vdo1 xfs 50G 390M 50G 1% /vbread