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40 Red Hat Certification Questions And Answers

1⟩ Suppose 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.

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

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 ->Creating blank quota database file.

3. mount -o remount /home-> 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 ->Initialization the quota on /home

5. edquota -u neo /home-> 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.

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2⟩ How to Successfully resolve to server1.example.com where your DNS server is 172.24.254.254

DNS is the Domain Name System, which maintains a database that can help your

computer translate domain names such as www.redhat.com to IP addresses such as

216.148.218.197. As no individual DNS server is large enough to keep a database for the

entire Internet, they can refer requests to other DNS servers.

DNS is based on the named daemon, which is built on the BIND (Berkeley Internet

Name Domain) package developed through the Internet Software Consortium

Users wants to access by name so DNS will interpret the name into ip address. You need

to specify the Address if DNS server in each and every client machine. In Redhat

Enterprise Linux, you need to specify the DNS server into /etc/resolv.conf file.

After Specifying the DNS server address, you can verify using host, dig and nslookup

commands.

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3⟩ Suppose You Completely Install the Redhat Enterprise Linux ES 4 on your System. While start the system, its giving error to load X window System. How will you fix that problem and make boot successfully run X Window System.

Thinks While Problems occurred on booting System on Runlevel 5 (X Window).

1. /tmp is full or not

2. Quota is already reached

3. Video card or resolution or monitor is misconfigured.

4. xfs service is running or not.

Do These:

1. df h /tmp /tmp is full remove the unnecessary file

2. quota username if quota is already reached remove unnecessary file from home directory.

3. Boot the System in runlevel 3. you can pass the Kernel Argument from boot loader.

4. Use command: system-config-display It will display a dialog to configure the monitor, Video

card, resolution etc.

5. Set the Default Runlevel 5 in /etc/inittab id:5:initdefault:

6. Reboot the System you will get the GUI login Screen.

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5⟩ Suppose Your system is giving error while booting on Runlevel 5 . Make successfully boot your system in runlevel 5.

While you load the X Window System, you will get the problem. To troubleshoot follow

the following steps:

1. Check the /tmp is full ?

2. Check your quota, hard limit is already crossed ?

3. Check xfs service is running ?

4. Boot the system on runlevel 3 and execute the system-config-display command

5. Edit the /etc/inittab to set default runlevel 5.

id:5:initdefault:

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9⟩ Suppose 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 Networks Host.

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

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11⟩ Explain Samba is used for A. Sharing resources from a Linux machine to a Windows machine B. Accessing resources from a Windows machine, for example mounting an SMB share on a Linux machine C. Perform password administration. D. Configure NFS shares.

A. Sharing resources from a Linux machine to a Windows machine

B. Accessing resources from a Windows machine, for example mounting an SMB share on a Linux machine

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12⟩ How to Create one partitions having size 100MB and mount it on /data

1. Use fdisk /dev/hda ->To create new partition.

2. Type n-> For New partitions

3. It will ask for Logical or Primary Partitions. Press l for logical.

4. It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.

5. Type the Size: +100M ->You can Specify either Last cylinder of Size here.

6. Press P to verify the partitions lists and remember the partitions name.

7. Press w to write on partitions table.

8. Either Reboot or use partprobe command.

9. Use mkfs -t ext3 /dev/hda?

Or

mke2fs -j /dev/hda? To create ext3 filesystem.

10. vi /etc/fstab

Write:

/dev/hda? /data ext3 defaults 1 2

11. Verify by mounting on current Sessions also:

mount /dev/hda? /data

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16⟩ Suppose There are two different networks, 192.168.0.0/24 and 192.168.1.0/24. Your System is in 192.168.0.0/24 Network. One RHEL 5 Installed System is going to use as a Router. All required configuration is already done on Linux Server. Where 192.168.0.254 and 192.168.1.254 IP Address are assigned on that Server. How will make successfully ping to 192.168.1.0/24 Networks Host?

1. vi /etc/sysconfig/network

GATEWAY=192.168.0.254

OR

vi /etc/sysconf/network-scripts/ifcfg-eth0

DEVICE=eth0

BOOTPROTO=static

ONBOOT=yes

IPADDR=192.168.0.?

NETMASK=255.255.255.0

GATEWAY=192.168.0.254

2. service network restart

vim /etc/sysctel

where is 0 set 1 in first line

save file

systecl -p

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17⟩ Suppose You Completely Install the Redhat Enterprise Linux 5 on your System. While start the system, its giving error to load X window System. How will you fix that problem and make boot successfully run X Window System.

Think while Problems occurred on booting System on Runlevel 5 (X Window).

1. /tmp is full or not

2. Quota is already reached

3. Video card or resolution or monitor is misconfigured.

4. xfs service is running or not.

Do These:

1. df -h /tmp /tmp is full remove the unnecessary file

2. quota username if quota is already reached remove unnecessary file from home

directory.

3. Boot the System in runlevel 3. you can pass the Kernel Argument from boot

loader.

4. Use command: system-config-display It will display a dialog to configure the

monitor, Video card, resolution etc.

5. Set the Default Runlevel 5 in /etc/inittab

id:5:initdefault:

6. Reboot the System you will get the GUI login Screen.

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19⟩ How to Make a swap partition having 100MB. Make Automatically Usable at System Boot Time.

1. Use fdisk /dev/hda ?To create new partition.

2. Type n ?For New partition

3. It will ask for Logical or Primary Partitions. Press l for logical.

4. It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.

5. Type the Size: +100M ?You can Specify either Last cylinder of Size here.

6. Press P to verify the partitions lists and remember the partitions name.

Default System ID is 83 that means Linux Native.

7. Type t to change the System ID of partition.

8. Type Partition Number

9. Type 82 that means Linux Swap.

10. Press w to write on partitions table.

11. Either Reboot or use partprobe command.

12. mkswap /dev/hda? ?To create Swap File system on partition.

13. swapon /dev/hda? ?To enable the Swap space from partition.

14. free ?m ?Verify Either Swap is enabled or not.

15. vi /etc/fstab

/dev/hda? swap swap defaults 0 0

16. Reboot the System and verify that swap is automatically enabled or not.

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