RedHat EX200 Red Hat Certified System Administrator - RHCSA (8.2) Exam Practice Test

• vi /etc/resolv.conf

nameserver 172.24.254.254

• host server1.example.com

On every clients, DNS server is specified in /etc/resolv.conf. When you request by name it tries to resolv from DNS server.

• vi /etc/sysconfig/network GATEWAY=192.168.0.254

OR

vi /etc/sysconf/network-scripts/ifcfg-eth0 DEVICE=eth0

BOOTPROTO=static

ONBOOT=yes

IPADDR=192.168.0.?

NETMASK=255.255.255.0

GATEWAY=192.168.0.254

• service network restart

Gateway defines the way to exit the packets. According to question System working as a router for two networks have IP Address 192.168.0.254 and 192.168.1.254.

• Create a partition having size 5 GB and change the syste id '8e'.
• use partprobe command
• pvcreate /dev/hda9 Suppose your partition number is hda9.
• vgextend test0 /dev/hda9 vgextend command add the physical disk on volume group.
• lvextend -L+5120M /dev/test0/lvtestvolume
• verify using lvdisplay /dev/test0/lvtestvolume.

*

[root@node1 ~]# crontab -l -u natasha

no crontab for natasha

[root@node1 ~]# crontab -e -u natasha

23 14 * * * /bin/echo hello

*/2 * * * * /bin/echo 2min

crontab: installing new crontab

[root@node1 ~]# crontab -l -u natasha

23 14 * * * /bin/echo hello

*/2 * * * * /bin/echo 2min

[root@node1 ~]# systemctl status crond.service

*

### For Checking ###

[root@node1 ~]# tail -f /var/log/cron

Mar 23 13:23:48 node1 crontab[10636]: (root) REPLACE (natasha)

Mar 23 13:23:48 node1 crontab[10636]: (root) END EDIT (natasha)

Mar 23 13:23:50 node1 crontab[10638]: (root) LIST (natasha)

Mar 23 13:24:01 node1 crond[1349]: (root) FAILED (loading cron table)

Mar 23 13:24:02 node1 CROND[10673]: (natasha) CMD (/bin/echo 2min)

*

[root@node1 ~]# cp -p /etc/fstab /var/tmp/

[root@node1 ~]# ls -lrt /etc/fstab

[root@node1 ~]# ls -lrt /var/tmp/fstab

[root@node1 ~]# chmod a+x /var/tmp/fstab

[root@node1 ~]# getfacl /var/tmp/fstab

[root@node1 ~]# setfacl -m u:harry:rw- /var/tmp/fstab

[root@node1 ~]# setfacl -m u:natasha:--- /var/tmp/fstab

[root@node1 ~]# getfacl /var/tmp/fstab

getfacl: Removing leading '/' from absolute path names

# file: var/tmp/fstab

# owner: root

# group: root

user::rwx

user:harry:rw-

user:natasha:---

group::r-x

mask::rwx

other::r-x

*

[root@node1 ~]# su - natasha

[natasha@node1 ~]$ cat /var/tmp/fstab

cat: /var/tmp/fstab: Permission denied

*

[root@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vdb 252:16 0 5G 0 disk

└─vdb1 252:17 0 4.2G 0 part

└─vgrz-lvrz 253:2 0 4.1G 0 lvm /datarz

vdc 252:32 0 5G 0 disk

└─vdc1 252:33 0 4.4G 0 part

└─datavg-datalv 253:3 0 3.9G 0 lvm /data

vdd 252:48 0 5G 0 disk

vde 252:64 0 10G 0 disk

[root@node2 ~]# lvs

LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert

lvrz vgrz -wi-ao---- 4.10g

[root@node2 ~]# vgs

VG #PV #LV #SN Attr VSize VFree

vgrz 1 1 0 wz--n- <4.15g 48.00m

[root@node2 ~]# parted /dev/vdb print

Number Start End Size Type File system Flags

1 1049kB 4456MB 4455MB primary lvm

*

[root@node2 ~]# df -hT

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/vgrz-lvrz ext4 4.0G 17M 3.8G 1% /datarz

[root@node2 ~]# parted /dev/vdb mkpart primary 4456MiB 5100MiB

[root@node2 ~]# parted /dev/vdb set 2 lvm on

[root@node2 ~]# udevadm settle

[root@node2 ~]# pvcreate /dev/vdb2

Physical volume "/dev/vdb2" successfully created.

*

[root@node2 ~]# vgextend vgrz /dev/vdb2

Volume group "vgrz" successfully extended

[root@node2 ~]# lvextend -r -L 4600M /dev/vgrz/lvrz

Size of logical volume vgrz/lvrz changed from 4.10 GiB (1050 extents) to 4.49 GiB (1150 extents).

Logical volume vgrz/lvrz successfully resized.

[root@node2 ~]# resize2fs /dev/vgrz/lvrz

[root@node2 ~]# df -hT

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/vgrz-lvrz ext4 4.4G 17M 4.2G 1% /datarz

• vim /etc/auto.master /rhome /etc/auto.misc

wq!

# vim /etc/auto.misc

ldapuser11 --rw,sync host.domain11.example.com:/rhome/ldpauser11 :wq!

#service autofs restart

• service autofs reload
• chkconfig autofs on
• su -ldapuser11

Login ldapuser with home directory

# exit

# fdisk /dev/vda

n

+512M

w

# partprobe /dev/vda

# mkfs -t ext4 /dev/vda5

# mkdir -p /data

# vim /etc/fstab

/dev/vda5 /data ext4 defaults 0 0

# mount -a

crontab -u mary -e

23 14 * * * echo "Hello World."

Yum-config-manager is to generate a file vim content.example.com_rhel7.0_x86_64_dvd.repo, Add a line gpgcheck=0

Yumcleanall

Yumrepolist

Almost 4305 packages are right, Wrong Yum Configuration will lead to some following questions cannot be worked out.

• chmod g+s /archive
• Verify using: ls -ld /archive Permission should be like:

drwxrws--- 2 root sysuser 4096 Mar 16 18:08 /archive

If SGID bit is set on directory then who every users creates the files on directory group owner automatically the owner of parent directory.

To set the SGID bit: chmod g+s directory

To Remove the SGID bit: chmod g-s directory

# cd /home/

# mkdir admins /

# chown .admin admins/

# chmod 770 admins/

# chmod g+s admins/

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

# useradd -u 1234 alex

# passwd alex

alex111

alex111

OR

echo alex111|passwd -stdin alex

# useradd -u 601 -s /sbin/nologin user1

# passwd user1

redhat

• if=/dev/zero of=/swapfile bs=1M count=600 mkswap /swapfile

/etc/fstab:

/swapfile swap swap defaults 0 0 mount -a

(a) Created as administrator

# crontab -u natasha -e

23 14 * * * /bin/echo "file"

(b)Created as natasha

# su - natasha

$ crontab -e

23 14 * * * /bin/echo "file"

*

[root@node1 ~]# yum install chrony

[root@node1 ~]# vim /etc/chrony.conf

pool utility.domain15.example.com iburst

[root@node1 ~]# systemctl enable chronyd

[root@node1 ~]# systemctl restart chronyd

[root@node1 ~]# systemctl status chronyd

[root@node1 ~]# tzselect

Please identify a location so that time zone rules can be set correctly.

Please select a continent, ocean, "coord", or "TZ".

1) Africa

2) Americas

3) Antarctica

4) Asia

11) TZ - I want to specify the time zone using the Posix TZ format.

#? 4

*

Please select a country whose clocks agree with yours.

1) Afghanistan 18) Israel 35) Palestine

2) Armenia 19) Japan 36) Philippines

3) Azerbaijan 20) Jordan 37) Qatar

4) Bahrain 21) Kazakhstan 38) Russia

5) Bangladesh 22) Korea (North) 39) Saudi Arabia

#? 5

The following information has been given:

Bangladesh

Therefore TZ='Asia/Dhaka' will be used.

Is the above information OK?

1) Yes

2) No

#? 1

Asia/Dhaka

[root@node1 ~]# chronyc sources -v

^? utility.domain15.example> 0 7 0 - +0ns[ +0ns] +/- 0ns

system-config-authentication

LDAP Server: ldap//instructor.example.com (In domain form, not write IP)

OR

# yum groupinstall directory-client (1.krb5-workstation 2.pam-krb5 3.sssd)

# system-config-authentication

1.User Account Database: LDAP

2.LDAP Search Base DN: dc=example,dc=com

3.LDAP Server: ldap://instructor.example.com (In domain form, not write IP) 4.Download CA Certificate

5.Authentication Method: LDAP password

6.Apply

getent passwd ldapuser40