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Q21. You have mounted an Oracle Linux 6 ISO image (v33411-01.iso) on your system in the /mnt/iso/OL6u3/Server directory. You want to use this image in your local yum repository configuration file and enable it. Which yum repository configuration file has the correct entries to use this image as a local repository?
A. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=file:///mnt/iso/OL6u3/Server gpgcheck=1 enabled=0
B. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=file:///mnt/iso/V33411-01.iso gpgcheck=1 enabled=1
C. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=file:///mnt/iso/OL6u3/Server gpgcheck=1 enabled=1
D. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=http:///mnt/iso/OL6u3/Server gpgcheck=1 enabled=1
Explanation: Example: Create a yum .repo file:
cat > ol63iso.repo << EOF
name=Oracle Linux 6 Media
Not B: Specifiy the directory, not the iso file name.
Not C: Enabled should be 0, not 1.
Not D: Use file: not http: to specify the directory
Q22. Which two conditions will cause OCFS2 to evict a node?
A. When a node no longer responds to network heartbeat signals from other members of the cluster
B. When storage array is at 90% capacity
C. When access to storage is lost
D. When a node is running at 90% utilization
Explanation: A:How does the disk heartbeat work? Every node writes every two secs to its block in the heartbeat system file. The block offset is equal to its global node number. So node 0 writes to the first block, node 1 to the second, etc. All the nodes also read the heartbeat sysfile every two secs. As long as the timestamp is changing, that node is deemed alive.
Q23. A system administrator wants to enable packet without making the changes permanent.
What command would he use to complete this action?
A. Echo 1> /proc/sys/net/ip_forward/
B. Echo 1> /proc/sys/net/ipv4_ip_forward
C. Echo 1 > /etc/sysconfig/sys/net/ipv4/ip_forward
D. Echo 0 > /proc/sys/net/ipv4/ip_forward
Explanation: The '1' in "/proc/sys/net/ipv4/ip_forward" enables IP forwarding.
A '0' signifies IP forwarding is disabled.
Q24. The DBA tells you that the system is not overloaded but you can tell that the system us actively swapping. What command would you run to show this information to the DBA?
A. # iotop
B. # iostat 5 10
C. # cat /proc/meminfo
D. # vmstat 5 10
Explanation: *iostat - Report Central Processing Unit (CPU) statistics and input/output statistics for devices, partitions and network filesystems (NFS).
*The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.
Not A: Related to kernel and processes. *iotop - simple top-like I/O monitor *iotop watches I/O usage information output by the Linux kernel (requires 2.6.20 or later) and displays a table of current I/O usage by processes or threads on the system.
*iotop displays columns for the I/O bandwidth read and written by each process/thread during the sampling period. It also displays the percentage of time the thread/process spent while swapping in and while waiting on I/O. For each process, its I/O priority (class/level) is shown. In addition, the total I/O bandwidth read and written during the sampling period is displayed at the top of the interface.
Not C: related to RAM usage. *The entries in the /proc/meminfo can help explain what's going on with your memory usage, if you know how to read it. *High-Level Statistics MemTotal: Total usable ram (i.e. physical ram minus a few reserved bits and the kernel binary code) MemFree: Is sum of LowFree+HighFree (overall stat) MemShared: 0; is here for compat reasons but always zero. Buffers: Memory in buffer cache. mostly useless as metric nowadays Cached: Memory in the pagecache (diskcache) minus SwapCache SwapCache: Memory that once was swapped out, is swapped back in but still also is in the swapfile (if memory is needed it doesn't need to be swapped out AGAIN because it is already in the swapfile. This saves I/O)
Not D:vmstat - Report virtual memory statistics
Q25. Examine the output of the yum.conf configuration file from o Oracle Linux 6 server.
What does the “installonly_limit=3” option mean?
A. Only three users can use the yum command simultaneously to install package on Oracle Linux 6 server.
B. Only three Linux packages can be installed in one invocation of the yum command.
C. Only three repository channels can be used for installing Linux packages.
D. Only three versions of packages listed in installonlypkgs can be installed simultaneously.
Explanation: installonly_limit Number of packages listed in installonlypkgs to keep installed at the same time. Setting to 0 disables this feature. Default is '3'. Note that this functionality used to be in the "installonlyn" plugin, where this option was altered via. tokeep. Note that as of version 3.2.24, yum will now look in the yumdb for a installonly attribute on installed packages. If that attribute is "keep", then they will never be removed.
Q26. You want to add a README.txt file in the home directory of every new user that you create by using the useradd command on your Oracle Linux system. In which directory will you place the README.txt file so that it automatically gets copied to the new user’s home directory when the user is created?
Explanation: -k, --skel SKEL_DIR
The skeleton directory, which contains files and directories to be copied in the user's home
directory, when the home directory is created by useradd.
This option is only valid if the -m (or --create-home) option is specified.
If this option is not set, the skeleton directory is defined by the SKEL variable in
/etc/default/useradd or, by default, /etc/skel.
*useradd - create a new user or update default new user information
Reference: man useradd
Q27. View the exhibits.
Examine the output of sar command and the top command in the Exhibits. Which statement is the correct interpretation of this data?
A. The system is running low on swap space and memory.
B. CPU is Idle and the system has plenty of free memory available.
C. The CPU utilization is high and one process is using most of the CPU.
D. The system is idle with very little memory, CPU, and I/O utilization.
Explanation: From the top exhibit we see that npviewer.gin uses 73.4% of the available CPU.
*sar - Collect, report, or save system activity information.
*The sar command writes to standard output the contents of selected cumulative activity counters
in the operating system. The accounting system, based on the values in the count and interval
parameters, writes information the specified number of times spaced at the specified intervals in
*sar –u 2 5
Report CPU utilization for each 2 seconds. 5 lines are displayed.
Q28. Examine the following snippet from the rsyslog.conf file.
kern.info; kern.!err /var/adm/kernel.log
What do these two rules mean?
A. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all kernel messages that come with priorities from info and up in the /var/adm/kernel.log file.
B. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all kernel messages that come with priorities from info up to warning in the /var/adm/kernel.log file.
C. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all messages that come with priorities from info and err in the /var/adm/kernel.log file.
D. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all kernel messages that come with priorities other than info and err into the /var/adm/kernel.log file.
kern.* /var/adm/kernel kern.crit @finlandia;RFC3164fmt kern.crit /dev/console kern.info;kern.!err /var/adm/kernel-info
The first rule direct any message that has the kernel facility to the file /var/adm/kernel.
The second statement directs all kernel messages of the priority crit and higher to the remote host finlandia. This is useful, because if the host crashes and the disks get irreparable errors you might not be able to read the stored messages. If they're on a remote host, too, you still can try to find out the reason for the crash.
The third rule directs these messages to the actual console, so the person who works on the machine will get them, too.
The fourth line tells rsyslogd to save all kernel messages that come with priorities from info up to warning in the file /var/adm/kernel-info. Everything from err and higher is excluded.
Q29. Which option determines whether a system users NIS, local files, DNS, or a combination as the source of information, and also order of the source?
Explanation: The Name Service Switch (NSS) configuration file, /etc/nsswitch.conf, is used by the GNU C Library to determine the sources from which to obtain name-service information in a range of categories, and in what order. Each category of information is identified by a database name.
The file is plain ASCII text, with columns separated by spaces or tab characters. The first column specifies the database name. The remaining columns describe the order of sources to query and a limited set of actions that can be performed by lookup result.
Incorrect: Not A: In most Unix-like operating systems and others that implement the BIND Domain Name System (DNS) resolver library, the resolv.conf configuration file contains information that
Not D:/etc/yp.conf - NIS binding configuration file
Q30. You have to mount the Oracle Linux ISO image file OracleLinux –R6 – U2 – Server – X86_64-dvd.iso to the /media/cdrom mount point. Which command will help you mount the Oracle Linux ISO image file?
A. # mount OracleLinux –R6 –U2 –Server X86_64-dvd.iso /media/cdrom
B. # mount –t DVD OracleLinux –R6 –U2-Server-X86_64-DVD.iso/media/cdrom
C. # mount /dvd/OracleLinux -R6 -U2- Server=X86_64-dvd.iso /media/cdrom/OracleLinux-R6-UI-Server-X86_64-dvd.iso
D. # mount – 0 ro, loop oracleLinux –R6 –U2 –Server –X86_64 –dvd.iso /media/cdrom
Explanation: Mount the DVD iso of the desired update of Oracle Linux Release 5. Use the following command for mounting the DVD media inserted in /dev/cdrom
# mount -r -o loop -t iso9660 /dev/cdrom /mnt Use following command to mount iso image file # mount -o loop <iso image file name> /mnt