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2021 Apr RH302 practice
Q101. CORRECT TEXT
Whoever creates the file on /data make automatically owner group should be the group owner of /data directory.
Answer and Explanation:
When user creates the file/directory, user owner will be user itself and group owner will be the primary group of the user.
There is one Special Permission SGID , when you set the SGID bit on directory,When users creates the file/directory automatically owner group will be same as a parent.
1. chmod g+s /data
2. Verify using: ls -ld /data
You will get: drwxrws---
Q102. CORRECT TEXT
/data Directory is shared from the server1.example.com server. Mount the shared directory that:
d. when user try to access, automatically should mount
e. when user doesn't use mounted directory should unmount automatically after 50 seconds.
f. Shared directory should mount on /mnt/data on your machine.
Answer and Explanation:
6. vi /etc/auto.master
/mnt /etc/auto.misc --timeout=50
7. vi /etc/auto.misc
8. data -rw,soft,intr server1.example.com:/data
9. service autofs restart
10. chkconfig autofs on
When you mount the other filesystem, you should unmount the mounted filesystem, Automount feature of linux helps to mount at access time and after certain seconds, when user unaccess the mounted directory, automatically unmount the filesystem.
/etc/auto.master is the master configuration file for autofs service. When you start the service, it reads the mount point as defined in /etc/auto.master.
Q103. 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
Q104. CORRECT TEXT
There are mixed lots of System running on Linux and Windows OS. Some users are working on Windows Operating System. You want to make available /data directory to samba users only from 192.168.0.0/24 network. Configure the samba server.
Answer and Explanation:
1. vi /etc/samba/smb.conf
[global]
netbios name=station?
workgroup = mygroup
server string=Share from Linux Server
security=user
smb passwd file=/etc/samba/smbpasswd
encrypt passwords=yes
hosts allow=192.168.0.
[data]
path=/data
writable=yes
public=no
browsable=yes
2. service smb start| restart
3. 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 to 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.
To allow access the shared directory only from certain network or hosts, there is a option hosts allow= host or network. If this option is applied on global option, then it will apply to all shared directory.
Q105. 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.
Regenerate RH302 test questions:
Q106. 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.
Q107. CORRECT TEXT
Whoever creates the file on /data make automatically owner group should be the group owner of /data directory.
Answer and Explanation:
When user creates the file/directory, user owner will be user itself and group owner will be the primary group of the user.
There is one Special Permission SGID bit, when you set the SGID bit on directory,When users creates the file/directory automatically owner group will be same as a parent directory.
9. chmod g+s /data
10. Verify using: ls -ld /data
You will get: drwxrws---
Q108. 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.
Q109. 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
/data 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 cracker.org on 172.25.0.0/16 network. Your system is based on example.com domain. SELinux should 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 /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
Editors
Text Based Internet
Server Configuration Tools
Printing Supports
When installation will complete, your system will reboot. Jump for another Question.
Q110. CORRECT TEXT
Make Secondary belongs the both users on sysadmin group.
Answer and Explanation:
1. usermod -G sysadmin john
2. usermod -G sysadmin jane
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.