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Q1. CORRECT TEXT
Install the Redhat Linux RHEL 5 through NFS. Where your Server is server1.example.com having IP 172.24.254.254 and shared /var/ftp/pub. The size of the partitions are listed below:
/ à 1048
/home à 1028
/boot à 512
/var à 1028
/usr à 2048
Swap -> 1.5 of RAM Size
/archive à configure the RAID Level 0 of remaining all free space.
After completing the installation through NFS solve the following questions. There are two networks 172.24.0.0/16 and 172.25.0.0/16. As well as there are two domains example.com on 172.24.0.0/16 network and my133t.org on 172.25.0.0/16 network. Your system is based on example.com domain. SELinux must be in enforcing mode.
Answer and Explanation:
1. Insert the CD on CD-ROM and start the system.
2. In Boot: Prompt type linux askmethod
3. It will display the language, keyboard selection.
4. It will ask you for the installation method.
5. Select the NFS Image from the list
6. It will ask the IP Address, Net mask, Gateway and Name Server. Select Use
Dynamic IP Configuration: because DHCP Server will be configured in your exam lab.
7. It will ask for the NFS Server Name and Redhat Enterprise Linux Directory.
Specify the NFS Server: 172.24.254.254
Directory: /var/ftp/pub
8. After Connecting to the NFS Server Installation start in GUI. Go up to the partition screen by selecting the different Options.
9. Create the partition According to the Question because Size and what-what partition should you create at installation time is specified in your question
10. Create the two RAID partitions having equal size of remaining all free space.
11. Click on RAID button
12. Type mount point /archive
13. Select RAID Level 0
14. Click on ok
15. Then select the MBR Options, time zone and go upto package selections.
It is another Most Important Time of installation. Due to the time limit, you should care about the installation packages. At Exam time you these packages are enough.
X-Window System
GNOME Desktop
(these two packages are generally not required)
Administration Tools.
System Tools
Windows File Server
FTP Servers
Mail Servers
Web Servers
Network Servers
Editors
Text Based Internet
Server Configuration Tools
Printing Supports
When installation will complete, your system will reboot. Jump for another Question.
Q2. CORRECT TEXT
Add a job on Cron schedule to display Hello World on every two Seconds in terminal 8.
Answer and Explanation:
1. cat >schedule
*/2 * * * * /bin/echo "Hello World" >/dev/tty8
3. crontab schedule
4. Verify using: crontab -l
5. service crond restart
Cron helps to schedule on recurring events. Pattern of Cron is:
Minute Hour Day of Month Month Day of Week Commands
0-59 0-23 1-31 1-12 0-7 where 0 and 7 means Sunday.
Note * means every. To execute the command on every two minutes */2.
To add the scheduled file on cron job: crontab filename
To List the Cron Shedule: crontab -l
To Edit the Schedule: crontab -e
To Remove the Schedule: crontab -r
Q3. CORRECT TEXT
One NIS Domain named rhce.com is configured in your lab, server is 192.168.0.254. rhce100, rhce200,rhce300 user are created on domain server.
Make your system as a member of rhce.com domain. Make sure that when nis user login in your system home directory should get by them. Home directory is separately shared on server eg /home/stationx/ where x is you station number.
Answer and Explanation:
1. use the authconfig --nisserver=192.168.0.254 --nisdomain=rhce.com --update or system-configauthentication
2. Click on Enable NIS
3. Type the NIS Domain: rhce.com
4. Type Server 192.168.0.254 then click on next and ok
5. You will get a ok message.
6. vi /etc/auto.master and write at the end of file
/home/stationx /etc/auto.home --timeout=60
7. vi /etc/auto.home and write
* -rw,soft,intr 192.168.0.254:/home/stationx/&
Note: please specify your station number in the place of x.
8. Service autofs restart
9. Login as the rhce1 or rhce2 or rhce3 on another terminal will be Success.
According to question, rhce.com domain is already configured. We have to make a client of rhce.com domain and automatically mount the home directory on every client. To make a member of domain, we use the autheconfig 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 reads the configuration from /etc/auto.master file.
On /etc/auto.master file we specified the mount point the configuration file for mount point.
Q4. CORRECT TEXT
Your system is giving error to load X window System. Make successfully boot your system in runlevel5.
Answer and Explanation:
While you load the X Window System, you will get the problem. Problem may caused by different error.
1. Check the /tmp is full ?
2. Check your quota, hard limit is already crossed ?
3. Check xfs service is running ?
4. Configure the Video card, Resolution, monitor type using: system-config-display (Most Probably in Redhat exam)
5. Edit the /etc/inittab to set default runlevel 5.
id:5:initdefault:
Q5. CORRECT TEXT
Change the Group Owner of /data to training group.
Answer and Explanation:
chown or chgrp command is used to change the ownership.
Syntax of chown: chown [-R] username:groupname file/directory
Syntax of chgrp: chgrp [-R] groupname file/directory
Whenever user creates the file or directory, the owner of that file/directory automatically will be that user and that user's primary group name.
To change group owner ship
6. chgrp training /data àWhich set the Group Ownership to training
or
chown root.training /data àWhich set the user owner to root and group owner to training group.
Verify /data using: ls -ld /data
You will get: drwxr-xr-x 2 root training ..............
Q6. CORRECT TEXT
You are working as an administrator of example.com domain. There are five web servers( www), three mail servers(mail1, mail2, mail). Configure the DNS for www, mail, mail1, mail2 by specifying mail.example.com is the Primary Mail Server for example.com domain. Where 192.168.100.1-5 for www, 6,7,8 for mail, mail1, m ail2 and 192.168.0.X for DNS.
Answer and Explanation:
1. Rename the file named.caching-nameserver.conf into named.conf file located into
/var/named/chroot/etc
#mv /var/named/chroot/etc/named.caching-nameserver.conf /var/named/chroot/etc/named.conf
2. Check the permission and ownership as well as SELinux Context should be like as:
-rw-r----- root named system_u:object_r:named_conf_t /var/named/chroot/etc/named.conf
If selinux context is mismatch use the restorecon -R /var command
3. vi /etc/named.conf
zone "example.com" IN {
type master;
file "example.com.zone";
};
/var/named/chroot/etc/named.conf file is used to register the zone as well as specify the global option for DNS server. There are two types of zone, i. Master, which contains the original data. ii.
Slave, backup of master. Here is the example of master zone configuration.
4. vi /var/named/chroot/var/named/example.com.zone
$TTL 345345
@ IN SOA @ webmaster.example.com.(
101; Serial Number
1H; Refresh Time
1M; Retry Time
1W; Expire Time
1D; Minimum Time to Live
)
@ IN NS 192.100.0.X
www 0 IN A 192.100.0.1
www 0 IN A 192.100.0.2
www 0 IN A 192.100.0.3
www 0 IN A 192.100.0.4
www 0 IN A 192.100.0.5
mail IN A 192.100.0.6
mail1 IN A 192.100.0.7
mail2 IN A 192.100.0.8
@ IN MX 5 mail.example.com.
@ IN MX 8 mail1.example.com.
@ IN MX 10 mail2.example.com.
3. service named start
4. rndc reload
5. chkconfig named on
6. Check the permission as well as SELinux Context should like this:
-rw-r--r-- root named root:object_r:named_zone_t
/var/named/chroot/var/named/example.com.zone
If selinux context is mismatch use the restorecon -R /var command
7. service named start
8. rndc reload
9. chkconfig named on
Zone file should create on /var/named/chroot/var/named. Default Directory Path is specified on
/var/named/chroot/etc/named.conf file.
$TTLàTime To Live, How much seconds cache server stores the information about DNS. And Five Parameters specified Serial Number used by slave to synchronize with master server. Refresh and Retry Time used by slave server. NS is the Name (DNS) server where lookup the domain. A (Associated IP) for particular host.
DNS has mechanism to load balance the request from clients. You can verify using host www.example.com command. MX resource records are used to define mail handler or exchanger for the domain. MX record must pass the positive integer value. This integer value is used by remote Mail Transport Agent (MTA) to determine, which host has delivery priority for the zone. The Lowest integer value will get the priority.
Q7. CORRECT TEXT
Configure the Slave DNS for example.com domain where master DNS is 192.100.0.254.
Answer and Explanation:
Slave DNS is the backup of master DNS. Automatically within a certain time slave DNS synchronizes with the Master DNS server.
1. vi /var/named/chroot/etc/named.conf
zone "example.com" IN {
type slave;
masters { 192.100.0.254; };
file "example.com.zone";
};
named-checkconf command checks the syntax for /var/named/chroot/etc/named.conf file.service named start | restart
Q8. CORRECT TEXT
Add a job on Cron schedule to display Hello World on every two Seconds in terminal 8.
Answer and Explanation:cat >schedule
*/2 * * * * /bin/echo "Hello World" >/dev/tty8crontab scheduleVerify using: crontab -lservice crond restart
Cron helps to schedule on recurring events. Pattern of Cron is:
Minute Hour Day of Month Month Day of Week Commands
0-59 0-23 1-31 1-12 0-7 where 0 and 7 means Sunday.
Note * means every. To execute the command on every two minutes */2.
To add the scheduled file on cron job: crontab filename
To List the Cron Shedule: crontab -l
To Edit the Schedule: crontab -e
To Remove the Schedule: crontab -r
Q9. CORRECT TEXT
There are some part-time staff in your office. And you gave the username user9 and user10 to them. Their Office time is 12-2pm on Sunday, Monday and Friday. Configure to login only on their office time.
Answer and Explanation:
1. vi /etc/security/time.conf
login;*;user9|user10;SuMoFri1200-1400
2. vi /etc/pam.d/login
account required pam_time.so
For Time based authentication, we should configured in /etc/security/time.conf
Syntax of /etc/security/time.conf
services;ttys;users;times
services
is a logic list of PAM service names that the rule applies to.
ttys
is a logic list of terminal names that this rule applies to.
users
is a logic list of users to whom this rule applies.
times
the format here is a logic list of day/time-range entries the days are specified by a sequence of two character entries, MoTuSa for example is Monday Tuesday and Saturday. Note that repeated days are unset MoMo = no day, and MoWk = all weekdays bar Monday. The two character combinations accepted are
Mo Tu We Th Fr Sa Su Wk Wd Al
the last two being week-end days and all 7 days of the week respectively. As a final example, AlFr means all days except Friday.
pam_time modules checks the file /etc/security/time.conf for authentication. So, we should call the pam_time modules in /etc/pam.d/login.
Q10. CORRECT TEXT
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.
Answer and Explanation:
1. First check the size of Logical Volume: lvdisplay /dev/vo/myvol
2. Make sure that the filesystem is in a consistent state before reducing:
# fsck -f /dev/vo/myvol
3. Now reduce the filesystem by 200MB.
# resize2fs /dev/vo/myvol 200M
4. It is now possible to reduce the logical volume.
#lvreduce /dev/vo/myvol -L 200M
4. Verify the Size of Logical Volume: lvdisplay /dev/vo/myvol
5. Verify that the size comes in online or not: df -h