Practice Free EX200 Red Hat Certified System Administrator - RHCSA (8.2) Exam Questions Answers With Explanation

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[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

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### 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)

# fdisk /dev/sda

p

(check Partition table)

n

(create new partition: press e to create extended partition, press p to create the main partition, and the extended partition is further divided into logical partitions)

Enter

+2G t

8 I

82

W

partx -a /dev/sda

partprobe

mkswap /dev/sda8

Copy UUID

swapon -a

vim /etc/fstab

UUID=XXXXX swap swap defaults 0 0

(swapon -s)

• chmod 770 /archive
• Verify using : ls -ld /archive Preview should be like:

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

To change the permission on directory we use the chmod command. According to the question that only the owner user (root) and group member (sysuser) can fully access the directory so: chmod 770 /archive

# cd /root; wget ftp://192.168.0.254/pub/boot.iso

# mkdir -p /media/cdrom

# vim /etc/fstab

/root/boot.iso /media/cdrom iso9660 defaults,loop 0 0

# mount -a

mount [-t vfstype] [-o options] device dir

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[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

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[root@node1 ~]# su - natasha

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

cat: /var/tmp/fstab: Permission denied

rpm -ivh kernel-firm…

rpm -ivh kernel...

1. vi /etc/auto.master

/mnt /etc /auto.misc --timeout=50

• vi /etc/auto.misc
• data -rw,soft,intr server1.example.com:/data
• service autofs restart
• chkconfig autofs on

When you mount the other filesystem, you should unmount the mounted filesystem, Automount feature of linux helps to mount at access time and after certain seconds, when user unaccess the mounted directory, automatically unmount the filesystem.

/etc/auto.master is the master configuration file for autofs service. When you start the service, it reads the mount point as defined in /etc/auto.master.

groupadd adminuser

useradd natasha -G adminuser

useradd haryy -G adminuser

useradd sarah -s /sbin/nologin

Passwd user name // to modify password or echo redhat | passwd --stdin user name id natasha // to view user group.

yum install vsftpd

/etc/init.d/vsftpd start

chkconfig vsftpd on

nameserver is specified in question,

1. Vi /etc/resolv.conf

nameserver 192.168.0.254

2. host server1.example.com

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•

[root@host ~]#systemctl enable sssd.service

[root@host ~]#systemctl start sssg.service

[root@host ~]#getent passwd remoteuser15

[root@host ~]#yum install autofs

[root@host ~]#vim /etc/auto.master.d/home9.autofs

/netdir/remoteuser15 /etc/auto.home9

[root@host ~]#vim /etc/auto.home9

remoteuser15 –rw,sync utility.network15.example.com:/netdir/remoteuser15/&

[root@host ~]#systemctl enable autofs

[root@host ~]#systemctl restart autofs

[root@host ~]#su - remoteuser15

• groupadd sysmgrs
• useradd -G sysmgrs Natasha

• We can verify the newly created user by cat /etc/passwd)

# useradd -G sysmgrs harry

# useradd -s /sbin/nologin sarrh

# passwd Natasha

# passwd harry

# passwd sarrah

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

crontab -u mary -e

23 14 * * * echo "Hello World."

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[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

vdd 252:48 0 5G 0 disk

vde 252:64 0 10G 0 disk

[root@node2 ~]# parted /dev/vdc mklabel msdos

[root@node2 ~]# parted /dev/vdc mkpart primary 1MiB 4200MiB

[root@node2 ~]# parted /dev/vdc set 1 lvm on

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[root@node2 ~]# udevadm settle

[root@node2 ~]# pvcreate /dev/vdc1

Physical volume "/dev/vdc1" successfully created.

[root@node2 ~]# vgcreate -s 16M datavg /dev/vdc1

Volume group "datavg" successfully created

[root@node2 ~]# lvcreate -n datalv -L 4000M datavg

Logical volume "datalv" created.

[root@node2 ~]# mkfs.xfs /dev/datavg/datalv

[root@node2 ~]# mkdir /data

[root@node2 ~]# blkid

/dev/mapper/datavg-datalv: UUID="7397a292-d67d-4632-941e-382e2bd922ce" BLOCK_SIZE="512" TYPE="xfs"

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[root@node2 ~]# vim /etc/fstab

UUID=7397a292-d67d-4632-941e-382e2bd922ce /data xfs defaults 0 0

[root@node2 ~]# mount UUID=7397a292-d67d-4632-941e-382e2bd922ce /data

[root@node2 ~]# reboot

[root@node2 ~]# df -hT

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/datavg-datalv xfs 3.9G 61M 3.9G 2% /data

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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

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[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

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

• rpm -ivh ftp://server1/example.com/pub/updates/zsh-*

or

• Login to ftp server : ftp ftp://server1.example.com using anonymous user.
• Change the directory: cd pub and cd updates
• Download the package: mget zsh-*
• Quit from the ftp prompt : bye
• Install the package
• rpm -ivh zsh-*
• Verify either package is installed or not : rpm -q zsh

• 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.

• 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/&

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.

getenforce // Check the current mode of SELinux // SELinux runs in enforcing mode // Check

getenforce 1

getenforce

vim /etc/selinux/config selinux=enforcing // To temporarily enable SELinux

wg

sestatus

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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

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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.

• cp -a /etc/fstab /var/tmp
• cd /var/tmp
• ls -l
• getfacl /var/tmp/fstab
• chmod ugo-x /var/tmp/fstab

[ No need to do this, there won't be execute permission for the file by default]

# setfacl -m u:natasha:rw /var/tmp/fstab # setfacl -m u:harry:0 /var/tmp/fstab(zero)

[Read permission will be there for all the users, by default. Check it using ls -l /var/tmp/fstab] Verify by

[ ls -la /var/tmp/fstab]

fdisk -cu /dev/vda

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

• useradd -u 3400 alex
• passwd alex
• su -alex

# useradd -G admin user2

# useradd -G admin user3

# passwd user2

redhat

# passwd user3

redhat

When you Boot the System, it starts on default Runlevel specified in /etc/inittab:

Id:?:initdefault:

When System Successfully boot, it will ask for username and password. But you don't know the root's password. To change the root password you need to boot the system into single user mode. You can pass the kernel arguments from the boot loader.

1. Restart the System.

2. You will get the boot loader GRUB screen.

3. Press a and type 1 or s for single mode ro root=LABEL=/ rhgb queit s

4. System will boot on Single User mode.

5. Use passwd command to change.

6. Press ctrl+d

crontab –e –u natasha

23 14/bin/echo hiya

crontab -l -u natasha // view

systemctlenable crond

systemcdlrestart crond

# find / -user ira > /root/findresults (if /root/findfiles is a file)

# mkdir -p /root/findresults

# find / -user ira -exec cp -a {} /root/findresults\; [ if /root/findfiles is a directory] ls /root/findresults

# fdisk /dev/sda

p

(check Partition table)

n

(create new partition: press e to create extended partition, press p to create the main partition, and the extended partition is further divided into logical partitions) Enter

+2G

t

l

W

partx -a /dev/sda

partprobe

mkswap /dev/sda8

Copy UUID

swapon -a

vim /etc/fstab

UUID=XXXXX swap swap defaults 0 0

(swapon -s)

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[root@node1 ~]# useradd -u 3945 fred

[root@node1 ~]# echo "iamredhatman" | passwd --stdin fred

Changing password for user fred.

passwd: all authentication tokens updated successfully

system-config-date &

system-config-authentication &

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[root@node1 ~]# cat /usr/share/mime/packages/freedesktop.org.xml | grep ich > /root/lines

[root@node1 ~]# cat /root/lines

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