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Posted by hemant on December 6, 2014

RHCE Lab Exam Practice Question and Answers Posted in: Linux, RHCSA and RHCE.

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These are some questions i faced in my RHCSA and RHCE lab exams and following steps i have taken to clear my both exams. If you want to clear both the exams in a single attempt then i would request you to follow these steps i have taken. Note:- This was my Lab Scenario, in your exam the lab may be completely different i am just sharing my lab experience with you and guiding you how i solved my both labs or you can setup your own lab at home and try these questions for practice. For RHCSA visit here

RHCE Note:- new virtual system will be given for RHCE Exam Paper so set the and put ur system on dh according to the exam paper.

IPADD=DH DNS 192.168.0.254 YUM Repository URL ftp://instructor.example.com/pub/rhel/dvd/Server

.example.com 192.168.0.0/24 (ur n/w address) .remote.test 192.168.1.0/24 (cracker's n/w address)

for all s=

Initial Configuration :Go to single mode and set the . Firewall and Selinux configuration

#lokkit --disabled #lokkit --selinux=permissive #setup

Setup the network configuration to dh and dns as specified. Now set yum Client

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#vim Server.repo [Server] name=Server baseurl=ftp://192.168.0.254/pub/rhel6/dvd/Server enabled=1 gpgcheck=0 :wq!

#init 6

with root Now start checking conectivity

#ifconfig #hostname #ping 192.168.0.254 ////server ( instructor) ip address #nslookup 192.168.0.[100+X] //// your ip address # yum list all

1) Selinux Set SELinux to enforcing mode

#lokkit --disabled #lokkit --selinux=enforcing #sestatus #setenforce 1 #sestatus

2) Ip forwarding Configure your host such that it can forward ipv4 packets

#vi /etc/sysctl.conf Change net.ipv4.ip_forward = 0 change 0 to 1

:wq!

#sysctl -

Note:- install nmap to check the configuration later

3) SMTP Note: check name Configure an SMTP mail server. Your host should be able to receive remote mails. Mail of student should be spooled to /var/spool/mail/student.

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#rpm -qa postfix #vi /etc/postfix/main.cf

Search for [ine no.113] #inet_interface=all remove # of the line Add [Line no.116] # to the line inet_interface=localhost

:wq!

#service postfix restart #chkconfig --level 35 postfix on #mail [email protected] #su - student #mail ////you will see the mail #q

Remote Checking go to base system

#mail [email protected]

Go to virtual system and check

#mail ////you will see the mail #q #

4)Alias Note: check names All mails sent to should be directed to harry Create if not present and set .

#add harry #wd harry #add #wd

#vi /etc/aliases At the end : harry :wq!

#newaliases

Local testing

#mail [email protected]

#su - harry $mail

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Remote testing

#mail [email protected]

Now go to virtual system

$mail $

4) Script Create a script in bash /root/s1.sh such that ,If the script is run in the following manner – # /root/s1.sh foo o/p –> bar AND # /root/s1.sh bar o/p –> foo Make sure that if the no. arguement is not provided properly , then error o/p should be displayed as o/p –> foo|bar If wrong arguement is provided , then error o/p should be displayed as o/p –> foo|bar

#vi /root/s1.sh #!/bin/bash If [ $# -ne 1 ]; then echo “foo|bar” >&2 ///use this if redirection is der elif [ $1 = “foo” ]; then echo “bar” elif [ $1 = “bar” ]; then echo “foo” else echo “foo|bar” >&2 ///use this if redirection is der fi :wq!

#chmod u+x /root/s1.sh #/root/s1.sh #/root/s1.sh foo #/root/s1.sh bar #/root/s1.sh abcd

5) FTP Note: Check name Configure an ftp server. <sam> should be able to via ftp . anonymous can from your site. This service must be accessible only over .example.com network

#add sam #wd sam #yum install vsftpd* #head -15 /etc/vsftpd/vsftpd.conf Check anonymous_enable=yes

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#tail -5 /etc/vsftpd/vsftpd.conf Check t_wrapper=yes

Note:- if any of the above is no then open the file with vi editor and change to yes.

#service vsftpd restart #chkconfig --level 35 vsftpd on #getsebool -a | grep ftp #setsebool -P ftp_home_dir 1 # getsebool -a | grep ftp #vi /etc/hosts.deny

vsftpd:ALL EXCEPT .example.com /// depends on question

or

vsftpd:.my133l.org

wq! Local testing

#yum install ftp #ftp 192.168.0.[100+X] name: sam : ftp> bye

remote testing

#ftp 192.168.0.[100+X] name: sam : ftp> bye

6) NFS Share a directory /common over a n/w ,accessable to (domainX.example.com) .example.com network.

#mkdir /common #rpm -qa nfs-utils

#vi /etc/exports /common 192.168.0.0/24(sync)

wq!

#service nfs restart #chkconfig --level 35 nfs on

Local testing

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#showmount -

Remote testing

#showmount -e 192.168.0.117

7) Loop Mount an iso file /root/boot.iso on /disks . This mount should be persistant across system restart Note:- boot.iso file will be avalable in /root

#cd #ls #mkdir /disks #vi /etc/fstab

/root/boot.iso /disks iso9660 defaults,loop 0 0

wq!

#mount -Γ #df -!

8) SSH Congigure ssh server. .my133l.org (.remote.test) should be denied access to ftp server

#yum install openssh-server #service sshd restart #chkconfig --level 35 sshd on #vi /etc/hosts.deny sshd:.my133l.org //// depends on question OR sshd:ALL EXCEPT .example.com :wq! #service sshd restart

Remote testing

#ssh [email protected] #

9) Apache

Host an apache webserver over your hostname. The webpage to be hosted is shared as ftp://instructor.example.com/pub/web/station.html.

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The name resolution is provided on your dns server. Do not edit the webpage contents .

#yum install lftp* #yum install http* #lftp 192.168.0.254 ~>cd /pub/web ~>mget station* ~>bye #ls #mv station.html /var/www/html/index.html #vi /etc/httpd/conf/httpd.conf

Copy the 7 line and Remove #

Server [email protected] DocumentRoot /var/www/html ServerName serverX.example.com Errorlog logs/serverX.example.com......... Customlog logs/serverX.example.com......... /// save the file and exit #httpd #service httpd restart #chkconfig --level 35 httpd on #restorecon -R /var/www/html #elinks http://serverX.example.com

Check with firefox if needed Remote testing

#elinks serverX.example.com

10) iSCSI Import an iscsi disk from the server instructor.example.com(192.168.0.254) The iscsi disk must be mounted as /mnt/iscsi . This mount should be persistent across reboot.

#yum install iscsi-initiator-utils #iscsi -m discovery -t st –p instructor.example.com

Copy iqn.2010-09.com.example:rdisks.serverX

#iscsi -m node –T iqn.2010-09.com.example:rdisks.server17 –p 192.168.0.254 –·

#fdisk –cu /dev/sda

check how to create partition using fdisk here format the partition as per the given filesystem

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#mkfs.ext4 /dev/sda1 #mkdir /mnt/iscsi #blkid /dev/sda1

Copy UUID

#vi /etc/fstab

Paste uuid without” /mnt/iscsi ext4 defaults,_netdev 0 0

wq!

#mount -Γ #df -! #cd /mnt/iscsi #lftp 192.168.0.254 ~>cd pub ~>get a ~>bye #ls

12)Virtual Web Host a virtual website over (wwwX.example.com) d.example.com . The webpage to be hosted is shared asftp://instructor.example.com/pub/web/www.html . Create a DocumentRoot /var/www/virtual for hosting this page .

#lftp 192.168.0.254 ~>cd pub/web ~>mget ww* ~>bye #ls #mkdir /var/www/virtual #mv www.html /var/www/virtual/index.html #vi /etc/httpd/conf/httpd.conf

Copy the last 7 and replace serverX to wwwX and DocumentRoot to /var/www/virtual And also remove # of NameVirtualHost *:80 and ip your ip address 192.168.0.[100+X] in place of * wq!

#httpd – #service httpd restart #chkconfig –level 35 httpd on #restorecon –R /var/www/virtual #elinks http://wwwX.example.com

Remote testing

#elinks http://wwwX.example.com

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13) Samba Create a samba share /common with share name common . Your workgroup should be IT . this share should be browseable . The natasha can access this share as readable only . This share is accessible only over .example.com

#yum install samba* #mkdir /common #vi /etc/samba/smb.conf

When you scroll down you will find

[GLOBAL] workgroup=MYGROUP Change it to IT

go to the end of the script

[common] path = /common browseable = yes read list = natasha hosts allow = 192.168.0

wq!

#testparm #service smb restart #smbwd –a natasha #smbwd –e natasha #service smb restart #chkconfig –-level 35 smb on #chcon –t samba_share_t /common #ls –lZd /common #getsebool –a | grep samba #setsebool –P samba_enable_home_dir 1 #getsebool –a | grep samba #smbclient //192.168.0.[100+X]/common –U natsha Smb:\>

Remote testing

#smbclient //192.168.0.[100+X]/common –U natsha Smb:\>

14) Cron Deny The jean should not be able to add a cron job for herself

#add jean #wd jean #vi /etc.cron.deny Jean :wq!

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#su – jean $crontab –

15) Secure Directory copy the file station.html from server ( /pub/web ) OR [ftp://instructor.example.com/pub/web/station.html] to /var/www/html/secrete/ . Secure the file & make it available to only <serverX.example.com> over apache webserver .

#lftp 192.168.0.254 ~>cd /pub/web ~>mget station* ~>bye

#mkdir /var/www/html/secure # station.html /var/www/html/secrete #vi /etc/httpd/conf/httpd.conf

AllowOverride None Order deny,allow Allow from serverX.example.com Deny from all

wq!

#httpd – #service httpd restart #chkconfig –level 35 httpd on

Local testing

Open firefox http://serverX.example.com/secure

remote testing

Open firefox http://serverX.example.com/secure

16) Kernel Parameter a parameter sysvctl=1 to your kernel at boot time . changes made should be persistant .[ /etc/cmdline output ]

#vi /etc/grub.conf

Kernel.............................................................................auto rhgb quiet

At the end of the above line add sysvctl=1

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wq!

#init 6

NOTE :—- Now check all your configuration after reboot

#nmap 192.168.0.[100+X]

ftp,ssh,smtp,http,nfs port should be open

#chkconfig --list

Iscsid,nfs,smb,sshd should be runing

#cat /proc/cmdline

#df –!

#smbclient //192.168.0.[100+X]/common –u natasha

#mail [email protected]

#showmount –

#su – harry

$mail $

#ftp 192.168.0.[100+X] name:sam :

#elinks http://serverX.example.com #elinks http://wwwX.example.com

Open firefox

http://serverX.example.com/secure

#/root/s1.sh #/root/s1.sh foo

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#/root/s1.sh bar #/root/s1.sh abcd

Best Of Luck For Your Exam…

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