Red Hat RH302 ExamRed Hat Certified Engineer on Redhat Enterprise Linux 5 (Labs)

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Configure to allow the ssh service only from except

Answer and Explanation:

1. vi /etc/hosts.deny

sshd: 192.168.0. EXCEPT

We can secure the services using tcp_wrappers. There are main two files, /etc/hosts.allow and /etc/hosts.deny.

There will be three stage access checking

-Is access explicitly permitted? Means permitted from /etc/hosts.allow?

- Otherwise, Is access explicitly denied? Means denied from /etc/hosts.deny?

- Otherwise, by default permit access if neither condition matched.

To deny the services we can configure /etc/hosts.deny file using ALL and EXCEPT operation.

Pattern of /etc/hosts.allow and /etc/hosts.deny file is:


In Client list can be either domain name or IP address.


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


One Logical Volume named /dev/test0/testvolume1 is created. The initial Size of that disk is 100MB now you required more 200MB. Increase the size of Logical Volume, size should be increase on online.

Answer and Explanation:

1. lvextend -L+200M /dev/test0/testvolume1

Use lvdisplay /dev/test0/testvolume1)

2. 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.


Configure the webserver for your local domain. Download a www.html file from and rename it as index.html.

Answer and Explanation:

Your local domain mean domain. Lookup the using host you will get the IP address

1. vi /etc/httpd/conf/httpd.conf



DocumentRoot /var/www/example

DirectoryIndex index.html



2. mkdir /var/www/example

3. Download the index.html file from the ftp server specified in question

4. Rename the www.html file to index.html

Check the SELinux context of index page , should like this:

-rw-r--r-- root root system_u:object_r:httpd_sys_content_t /var/www/html/index.html

If SELinux Context is mismatched, use the restorecon -R /var command

5. service httpd start|restart

6. chkconfig httpd on

7. check using: links


Configure to allow the pop3 and imap connection from your domain

and domain.

Answer and Explanation:

1. vi /etc/hosts.deny

dovecot:ALL EXCEPT,

We can secure the services using tcp_wrappers. There are main two files, /etc/hosts.allow and /etc/hosts.deny.

There will be three stage access checking

- Is access explicitly permitted? Means permitted from /etc/hosts.allow?

- Otherwise, Is access explicitly denied? Means denied from /etc/hosts.deny?

- Otherwise, by default permit access if neither condition matched.

To deny the services we can configure /etc/hosts.deny file using ALL and EXCEPT operation.

Pattern of /etc/hosts.allow and /etc/hosts.deny file is:


In Client list can be either domain name or IP address.


You are working as an administrator of domain. There are five web servers( www), three mail servers(mail1, mail2, mail). Configure the DNS for www, mail, mail1, mail2 by specifying is the Primary Mail Server for domain. Where 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


#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 "" IN {

type master;

file "";


/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/

$TTL 345345

@ IN SOA @

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

www 0 IN A

www 0 IN A

www 0 IN A

www 0 IN A

mail IN A

mail1 IN A

mail2 IN A

@ IN MX 5

@ IN MX 8

@ IN MX 10

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


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 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.


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

Answer and Explanation:

1. chmod 770 /storage

2. Verify using : ls -ld /storage

Preview should be like:

drwxrwx--- 2 root sysusers 4096 Mar 16 18:08 /storage

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

chmod 770 /archive


Install the Redhat Linux RHEL 5 through NFS. Where your Server is having IP 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

/storageà configure the RAID Level 0 of remaining all free space.

After completing the installation through NFS solve the following questions. There are two networks and As well as there are two domains on network and on network. Your system is based on domain. SELinux should be in enforce 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:

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 /data

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


Text Based Internet

Server Configuration Tools


Printing Supports

When installation will complete, your system will reboot. Jump for another Question.


There are mixed lots of System running on Linux and Windows OS. Some users are working on Windows Operating System. There is a /data directory on linux server should make available on windows to user1 and user2 users on read and write mode and read only to other samba users.

Answer and Explanation:

1. vi /etc/samba/smb.conf


netbios name=station?

workgroup = mygroup

server string=Share from Linux Server


smb passwd file=/etc/samba/smbpasswd

encrypt passwords=yes






write list= user1 user2

2. smbpasswd -a user1

3. smbpasswd -a user2


4. service smb start | restart

5. chkconfig smb on

Samba servers helps to share the data between linux and windows. Configuration file is /etc/samba/smb.conf. There are some pre-defined section, i. global à use to define the global options, ii. Printers à use to share the printers, iii. homes à use the share the user's home directory.

Security=user à validation by samba username and password. May be there are other users also.

To allow certain share to certain user we should use valid users option.

smbpasswd à Helps to change user's smb password. -a option specifies that the username following should be added to the local smbpasswd file.

If any valid users option is not specified, then all samba users can access the shared data. By Default shared permission is on writable=no means read only sharing. Write list option is used to allow write access on shared directory to certain users or group members.


Set the Hostname station? where ? is your Host IP Address.

Answer and Explanation:

4. hostname station? àThis will set the host name only for current session. To set hostname permanently.

5. vi /etc/sysconfig/network


6. service network restart

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