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Q91. CORRECT TEXT

Make sure on /data that only the owner user can remove files/directories.

Answer and Explanation:

By default user1 can remove user2's files due to directory permission to group member. We can prevent of deleting files from others users using Sticky Bits.chmod o+t /dataVerify /data: ls –ld /data

You will get: drwxrwx-T

Q92. CORRECT TEXT

Install the Cron Schedule for jeff user to display "Hello" on daily 5:30.

Answer and Explanation:

Login as a root usercat >schedule.txt

30 05 * * * /bin/echo "Hello"

3. crontab -u jeff schedule.txt

4. service crond restart

The cron system is essentially a smart alarm clock. When the alarm sounds, Linux runs the commands of your choice automatically. You can set the alarm clock to run at all sorts of regular time intervals. Alternatively, the at system allows you to run the command of your choice once, at a specified time in the future.

Red Hat configured the cron daemon, crond. By default, it checks a series of directories for jobs to run, every minute of every hour of every day. The crond checks the /var/spool/cron directory for jobs by user. It also checks for scheduled jobs for the computer under /etc/crontab and in the /etc/cron.d directory.

Here is the format of a line in crontab. Each of these columns is explained in more detail:

#minute, hour, day of month, month, day of week, command

* * * * * command

Q93. CORRECT TEXT

Make Secondary belongs the jeff and marion users on sysusers group. But harold user should not belongs to sysusers group.

Answer and Explanation:

1. usermod -G sysusers jeff

2. usermod -G sysuser marion

3. Verify by reading /etc/group file

Using usermod command we can make user belongs to different group. There are two types of group one primary and another is secondary. Primary group can be only one but user can belongs to more than one group as secondary.

usermod -g groupname username à To change the primary group of the user

usermod -G groupname username à To make user belongs to secondary group.

Q94. CORRECT TEXT

Your System is configured in 192.168.0.0/24 Network and your nameserver is 192.168.0.254.

Make successfully resolve to server1.example.com.

Answer and Explanation:

Very Easy question, nameserver is specified in question,

1. vi /etc/resolv.conf

nameserver 192.168.0.254

2. host server1.example.com

Q95. CORRECT TEXT

You are giving the debug RHCT exam. The examiner told you that the password of root is redhat.

When you tried to login displays the error message and redisplayed the login screen. You changed the root password, again unable to login as a root. How will you make Successfully Login as a root.

Answer and Explanation:

When root unable to login into the system think:

4. Is password correct?

5. Is account expired?

6. Is terminal Blocked?

Do these Steps:

3. Boot the System on Single user mode.

4. Change the password

5. Check the account expire date by using chage -l root command.

If account is expired, set net expire date: chage -E "NEVER" root

7. Check the file /etc/securetty àWhich file blocked to root login from certain terminal.

8. If terminal is deleted or commented write new or uncomment.

9. Reboot the system and login as a root.

Q96. CORRECT TEXT

There are three Disk Partitions /dev/hda8, /dev/hda9, /dev/hda10 having size 100MB of each partition. Create a Logical Volume named testvolume1 and testvolume2 having a size 250MB.

Mount each Logical Volume on lvmtest1, lvmtest2 directory.

Answer and Explanation:

Steps of Creating LVM:

1. pvcreate /dev/hda8 /dev/hda9 /dev/hda10

àpvdisplay command is used to display the information of physical volume.

2. vgceate test0 /dev/hda8 /dev/hda9 /dev/hda10

àvgdisplay command is used to display the information of Volume Group.

3. lvcreate -L 250M -n testvolume1 test0

à lvdisplay command is used to display the information of Logical Volume.

4. lvcreate -L 250M -n testvolume2 test0

5. mkfs -t ext3 /dev/test0/testvolume1

6. mkfs -t ext3 /dev/test0/testvolume2

7. mkdir /lvtest1

8. mkdir /lvtest2

9. mount /dev/test0/testvolume1 /lvtest1

10. mount /dev/test0/testvolume2 /lvtest2

11. vi /etc/fstab

/dev/test0/testvolume2 /lvtest2 ext3 defaults 0 0

/dev/test0/testvolume1 /lvtest1 ext3 defaults 0 0

To create the LVM( Logical Volume Manager) we required the disks having '8e' Linux LVM type.

First we should create the physical Volume, then we can create the Volume group from disks belongs to physical Volume. lvcreate command is used to create the logical volume on volume group. We can specify the size of logical volume with -L option and name with -n option.

Q97. CORRECT TEXT

Make on /data that only the user owner and group owner member can fully access.

Answer and Explanation:

1. chmod 770 /data

2. Verify using : ls -ld /data

Preview should be like:

drwxrwx— 2 root sysadmin 4096 Mar 16 18:08 /data

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

chmod 770 /data

Q98. 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 or system-config-authentication

2. Select the [*] USE 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 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.

Q99. CORRECT TEXT

neo user tried by:

dd if=/dev/zero of=/home/neo/somefile bs=1024 count=70

files created successfully. Again neo tried to create file having 70K using following command:

dd if=/dev/zero of=/home/neo/somefile bs=1024 count=70

But he is unable to create the file. Make the user can create the file less then 70K.

Answer and Explanation:

Very Tricky question from redhat. Actually question is giving scenario to you to implement quota to neo user. You should apply the quota to neo user on /home that neo user shouldn't occupied space more than 70K.

1. vi /etc/fstab

LABEL=/home /home ext3 defaults,usrquota 0 0 à To enable the quota on filesystem you should mount the filesystem with usrquota for user quota and grpquota for group quota.

2. touch /home/aquota.user àCreating blank quota database file.

3. mount -o remount /home à Remounting the /home with updated mount options. You can verify that /home is mounted with usrquota options or not using mount command.

4. quotacheck -u /home à Initialization the quota on /home

5. edquota -u neo /home à Quota Policy editor

See the snapshot

Disk quotas for user neo (uid 500):

Filesystem blocks soft hard inodes soft hard

/dev/mapper/vo-myvol 2 30 70 1 0 0

Can you set the hard limit 70 and soft limit as you think like 30.

Verify using the repquota /home command.

Q100. CORRECT TEXT

Quota is implemented on /data but not working properly. Find out the

Problem and implement the quota to user1 to have a soft limit 60 inodes

(files) and hard limit of 70 inodes (files).

Answer and Explanation:

Quotas are used to limit a user's or a group of users' ability to consume disk space. This prevents a small group of users from monopolizing disk capacity and potentially interfering with other users or the entire system. Disk quotas are commonly used by ISPs, by Web hosting companies, on FTP sites, and on corporate file servers to ensure continued availability of their systems.

Without quotas, one or more users can upload files on an FTP server to the point of filling a filesystem. Once the affected partition is full, other users are effectively denied upload access to the disk. This is also a reason to mount different filesystem directories on different partitions. For example, if you only had partitions for your root (/) directory and swap space, someone uploading to your computer could fill up all of the space in your root directory (/). Without at least a little free space in the root directory (/), your system could become unstable or even crash.

You have two ways to set quotas for users. You can limit users by inodes or by kilobyte-sized disk blocks. Every Linux file requires an inode. Therefore, you can limit users by the number of files or by absolute space. You can set up different quotas for different filesystems. For example, you can set different quotas for users on the /home and /tmp directories if they are mounted on their own partitions.

Limits on disk blocks restrict the amount of disk space available to a user on your system. Older versions of Red Hat Linux included LinuxConf, which included a graphical tool to configure quotas.

As of this writing, Red Hat no longer has a graphical quota configuration tool. Today, you can configure quotas on RHEL only through the command line interface.

1. vi /etc/fstab

/dev/hda11 /data ext3 defaults,usrquota 1 2

2. Either Reboot the System or remount the partition.

Mount -o remount /dev/hda11 /data

3. touch /data/aquota.user

4. quotacheck -ufm /data

5. quotaon -u /data

6. edquota -u user1 /data

and Specified the Soft limit and hard limit on opened file.

To verify either quota is working or not:

Soft limit specify the limit to generate warnings to users and hard limit can't cross by the user. Use the quota command or repquota command to monitor the quota information.

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