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Q21. 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 reboot time. For current Session, we use service servicename start or restart or stop or status. For automatically at next reboot time:
3. chkconfig servicename on or off
eg: chkconfig nfs on
chkconfig portmap on
or
ntsysv
Select the nfs and portmap services.
4. Reboot the system and identify whether services are running or not.
Q22. CORRECT TEXT
Boot your System Successfully on runlevel 3.
Answer and Explanation:
This is boot related problem. There will be same questions repeated two times but problem is different.
First When you restart the system you will get the Error:
mount: error 15 mounting ext3
mount: error 2 mounting none
switchroot: mount failed: 22
umount /initrd/dev/: 2
Kernel Panic: no syncing: Attempted to kill init !
This error occurred in your system before showing welcome redhat linux. That means problem in grub boot loader.
Restart the System
Check the grub boot loader configuration by pressing e shortcut key.
You will see like:
root (hd0,0)
kernel /vmlinuz-2.6.9-5.EL ro root= / rhgb quiet
initrd /initrd-2.6.9-5.EL.img
OR
root (hd0,0)
kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/root rhgb quiet
initrd /initrd-2.6.9-5.EL.img
Then Edit Boot loader to make like
root (hd0,0)
kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.9-5.EL.img
Check all lines and edit as same as above. Press b to boot the system
After booting the system you should correct the /etc/grub.conf file.
Q23. CORRECT TEXT
Create the user named user1, user2, user3
Answer and Explanation:
2. useradd user1
3. useradd user2
4. useradd user3
5. passwd user1
6. passwd user2
7. passwd user3
We create the user using useradd command and we change the password of user using passwd command. If you want to set the blank password use: passwd -d username.
Q24. CORRECT TEXT
Make a swap partition having 100MB. Make Automatically Usable at System Boot Time.
Answer and Explanation:
1. Use fdisk /dev/hda àTo create new partition.Type n àFor New partitionIt will ask for Logical or Primary Partitions. Press l for logical.It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.Type the Size: +100M àYou can Specify either Last cylinder of Size here.Press P to verify the partitions lists and remember the partitions name. Default System ID is 83 that means Linux Native.Type t to change the System ID of partition.Type Partition NumberType 82 that means Linux Swap.Press w to write on partitions table.Either Reboot or use partprobe command.mkswap /dev/hda?àTo create Swap File system on partition.swapon /dev/hda?àTo enable the Swap space from partition.free -m àVerify Either Swap is enabled or not.vi /etc/fstab
/dev/hda? swap swap defaults 0 0Reboot the System and verify using free command that swap is automatically enabled or not.
Q25. CORRECT TEXT
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 Network's Host?
Answer and Explanation:
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
Q26. CORRECT TEXT
Your System is configured in 192.168.0.0/24 Network and your Domain 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
Q27. CORRECT TEXT
Add a job on Cron schedule to display Hello World on every two Seconds in terminal 8.
Answer and Explanation:cat >schedule
*/2 * * * * /bin/echo "Hello World" >/dev/tty8crontab scheduleVerify using: crontab -lservice crond restart
Cron helps to schedule on recurring events. Pattern of Cron is:
Minute Hour Day of Month Month Day of Week Commands
0-59 0-23 1-31 1-12 0-7 where 0 and 7 means Sunday.
Note * means every. To execute the command on every two minutes */2.
To add the scheduled file on cron job: crontab filename
To List the Cron Shedule: crontab -l
To Edit the Schedule: crontab -e
To Remove the Schedule: crontab -r
Q28. CORRECT TEXT
There are Mail servers, Web Servers, DNS Servers and Log Server. Log Server is already configured. You should configure the mail server, web server and dns server to send the logs to log server.
Answer and Explanation:
According to question, log server is already configured. We have to configure the mail, web and dns server for log redirection.
In mail, web and dns server:
1. vi /etc/syslog.conf
mail.* @logserveraddress
2. service syslog restart
mail is the facility and * means the priority. It sends logs of mail services into log server.
Q29. CORRECT TEXT
Add a new logical partition having size 100MB and create the /data which will be the mount point for the new partition.
Answer and Explanation:
Use fdisk /dev/hda àTo create new partition.Type n àFor New partitionsIt will ask for Logical or Primary Partitions. Press l for logical.It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.Type the Size: +100M àYou can Specify either Last cylinder of Size here.Press P to verify the partitions lists and remember the partitions name.Press w to write on partitions table.Either Reboot or use partprobe command.Use mkfs -t ext3 /dev/hda?Ormke2fs -j /dev/hda? àTo create ext3 filesystem.vi /etc/fstabWrite:/dev/hda? /data ext3 defaults 0 0Verify by mounting on current Sessions also:mount /dev/hda? /data
Q30. CORRECT TEXT
Some users home directory is shared from your system. Using showmount -e localhost command, the shared directory is not shown. Make access the shared users home directory.
Answer and Explanation:
1. Verify the File whether Shared or not ? : cat /etc/exports
2. Start the nfs service: service nfs start
3. Start the portmap service: service portmap start
4. Make automatically start the nfs service on next reboot: chkconfig nfs on
5. Make automatically start the portmap service on next reboot: chkconfig portmap on
6. Check default firewall is running in your system
# service iptables status
#iptables -F
#service iptables stop
#chkconfig iptables off
6. Verify Either sharing or not: showmount -e localhost
You will see that some shared directory will display