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Q61. CORRECT TEXT

You are working as a Network Engineer. Due to system processing, you want to limit the number of process to users. If then, configure that user1 and user2 should get one login at a time and all the members of training group can get total 5 logins.

Answer and Explanation:

1. vi /etc/security/limits.conf

user1,user2 - maxlogins 1

@training - maxlogins 5

2. vi /etc/pam.d/system-auth

session required /lib/security/pam_limits.so

To limit the number of process or number of logins, we should configure on /etc/security/limits.conf. First Columns contains the username separated by comma or @group name. Second column either hard or soft limits. Third columns called the item, maxloigns or nproc etc.

To identify the session of users we should call the pam_limits module in /etc/pam.d/system-auth.


Q62. CORRECT TEXT

Configure the caching only-name server for example.com where DNS server is 192.100.0.254.

Answer and Explanation:

1. vi /var/named/chroot/etc/named.conf

options {

forwarders { 192.168.22.250; };

forward only;

};

2. service named start | restart

Caching-only name server forwards a request to another name server or to the root name servers in orders to determine the authoritative name server for the resolution. Once resolution has taken place, the caching-only name server stores the resolved information in a cache for the designated time to live period.


Q63. 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.


Q64. CORRECT TEXT

You are giving the RHCE exam. Now you should boot your System properly. When you started your System, You got one message that.

INIT Entering runlevel 9

INIT: no more processes left in this runlevel

How will you boot your System properly?

Answer and Explanation:

You should know about the /etc/inittab file, where default runlevel will define. And Much more runlevel specific Scripts are called here.

Actually that problem will occur if you don't specify the default runlevel.

4. Reboot the system

5. Boot the System on single user mode.

Except for a normal boot of Linux, single-user mode is the most commonly used option. This is the system maintenance mode for experienced Linux administrators. It allows you to perform clean backups and restores to any partitions as needed from local hardware. It also allows you to run administration commands, recover or repair password and shadow password files, run filesystem checks, and so forth.

6. vi /etc/inittab and Write

id:runlevel:initdefault:

Standard Runlevels in RedHat Enterprise Linux


Q65. CORRECT TEXT

Create the group named sysuser.

Answer and Explanation:

1. groupadd sysuser

groupadd command is used to create the group and all group information is stored in /etc/group file.


Regenerate RH302 free practice exam:

Q66. CORRECT TEXT

Create the user named eric but eric should not belong to the sysadmin group.

Answer and Explanation:

1. useradd eric

Very tricky question given to you that this user should not belongs to sysadmin group.


Q67. CORRECT TEXT

There are two different networks 192.168.0.0/24 and 192.168.1.0/24. Where 192.168.0.254 and 192.168.1.254 IP Address are assigned on Server. Verify your network settings by pinging 192.168.1.0/24 Network's Host.

Answer and Explanation:

1. vi /etc/sysconfing/network

NETWORKING=yes

HOSTNAME=station?.example.com

GATEWAY=192.168.0.254

2. service network restart

Or

1. vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

ONBOOT=yes

BOOTPROTO=static

IPADDR=X.X.X.X

NETMASK=X.X.X.X

GATEWAY=192.168.0.254

2. ifdown eth0

3. ifup eth0


Q68. CORRECT TEXT

The System you are using is for NFS (Network File Services). Some important data are shared from your system. Make automatically start the nfs and portmap services at boot time.

Answer and Explanation:

We can control the services for current session and for next boot time also. For current Session, we use service servicename start or restart or stop or status. For automatically on next reboot time:

1. chkconfig servicename on or off

eg: chkconfig nfs on

chkconfig portmap on

or

ntsysv

Select the nfs and portmap services.

2. Reboot the system and identify whether services are running or not.


Q69. CORRECT TEXT

Create the user named jane and john.

Answer and Explanation:

1. useradd jane

2. useradd john

useradd command is used to create the user. All user's information stores in /etc/passwd and user;s shadow password stores in /etc/shadow.


Q70. 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.