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Q1. Examine the sar command below. Your Oracle Linux system has one CPU. What does the runq-sz column of this output convey about your system?
A. CPU is bottleneck because the run queue size is greater than the number of CPUs on your system.
B. The average of three processes are only using the CPU on your system and hence the CPU is not a bottleneck.
C. CPU is not a bottleneck because the run queue size indicates the number of CPU bound processes on your system.
D. CPU is a bottleneck because the run queue size indicates that adequate memory is not allocated.
Explanation: *Use the sar -q command to report the following information:
The Average queue length while the queue is occupied.
The percentage of time that the queue is occupied.
*The following list describes the output from the -q option.
The number of kernel threads in memory that are waiting for a CPU to run. Typically, this value should be less than 2. Consistently higher values mean that the system might be CPU-bound.
The percentage of time that the dispatch queues are occupied.
Swap queue of processes for the sar command.
Swap queue of processes for the sar command.
Q2. What does the following btrfs command do?
$ sudo btrfs subvolume snapshot src src-01
A. Creates snapshots of the src src-01 subvolumes
B. Creates a snapshot of the src-01 subvolumes in src
C. Creates the src and src-01 subvolumes and takes a snapshot of these subvolumes
D. Creates a snapshot of the src subvolumes in src-01
Explanation: *To create a snapshot use
sudo btrfs subvolume snapshot /mnt/@ /mnt/@_snapshot this will create a snapshot of the @ subvolume named @_snapshot located also in the top of the btrfs tree.
*btrfs subvolume snapshot <source> [<dest>/]<name> Create a writable snapshot of the subvolume <source> with the name <name> in the <dest> directory.
Q3. Which two statements are true about Oracle Clusterware Software?
A. Oracle Clusterware is a portable software that allows clustering of single servers so that they cooperate as single system.
B. Oracle Clusterware is a portable cluster software that can be installed on Oracle Engineered Systems.
C. Oracle Linux Support customers at the Basic or premier level are entitled, at no additional license and support costs, to download and deploy Oracle Clusterware in Linux cluster covered their Linux Support agreement.
D. Oracle Clusterware is an add-on software that is supported Oracle Linux only.
Explanation: A:Oracle Clusterware is software that enables servers to operate together as if they are one server. Each server looks like any standalone server. However, each server has additional processes that communicate with each other so the separate servers appear as if they are one server to applications and end users.
C:Oracle Linux support customers at the Basic and Premier support levels can download and
deploy Oracle Clusterware at no additional license fee or support cost.
Not D:Oracle ClusterWare services are available for Unix, Linux, and Windows.
Q4. Which three statements are true about the Kickstart installation method?
A. The Kickstart installation method helps to speedboottime after the system restarts.
B. A Kickstart file is created for every installation.
C. The Kickstart Configurator can be used to create or make changes to a kickstart file.
D. The Kickstart method allows for unattended and more standardized installations.
E. The Kickstart method of configuration is performed after the installation of the host operating system.
*A kickstart installation requires a kickstart file that contains the answers to every question asked
during an interactive installation. Kickstart files can be created in one of three ways:
/Perform an interactive installation. Once complete you will find the Kickstart configuration file for
the installation you just completed in the "/root/anaconda-ks.cfg" file. This can be amended and
used for subsequent installations.(B)
/Create a Kickstart file in a text editor manually, or based on a copy of a previous file.
/Use the Kickstart Configurator.(C)
D: *Kickstart installations provide an automated alternative to the normal interactive installations of RHEL and Oracle Linux. The automation of installation and post installation configuration steps represents a considerable time saving in situations where many similar installations are performed.
Reference:Kickstart - Automated Installations of RHEL and Oracle Linux
Q5. View the exhibit.
Examine the grub.conf file snippet in the Exhibit. Which statement is true if your Linux system boots by using this grub.conf file?
A. GRUB will boot, by default, the first kernel entry of this grub.conf file.
B. GRUB will prompt you to select the kernel to be booted because the default parameter is set to 0.
C. GRUB will boot the kernel specified in the inittab file of the system.
D. GRUB will boot, by default, the second kernel entry of this grub.conf file.
Explanation: According the grub .conf file you have got 8 seconds to choose whether to boot the first entry.Now if you want to change, and let say you want the second grub entry as booting system by default, justchange the line:default=0.bydefault=1
Q6. The change that are made by using echo command, like the one shown in the example below, are not persistent and disappear when the system us restarted. Which file should be modified to make configuration changes across reboots?
# echo www.example.com > /proc/sys/kernel/hostname
Explanation: A configuration file exists for the purpose of persisting changes,
named/etc/sysct1.conf. When booting, your server starts the procps service that reads this configuration file and applies all settings in it.
*If you've ever needed to change the hostname for Red Hat Linux, CentOS or similar operating systems, you can do so easily with one simple command.
Just use the echo command to replace the contents of /proc/sys/kernel/hostname with your new host name.
# echo hostname.com > /proc/sys/kernel/hostname
Then restart the network interfaces:
# /etc/init.d/network restart
Shutting down interface venet0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface venet0: RTNETLINK answers: File exists
RTNETLINK answers: File exists
[ OK ]
Now you can use the hostname command to verify that it has changed.
Q7. The ASMlib on Linux us designed to ___________.
A. Make managing ASM volume easier.
B. Make managing ASM volumes easier and provide a performance improvement over ASM volumes alone.
C. Provide load balancing across multiple volumes.
D. Allow the user to list contents of the volume from the OS command line.
Explanation: ASMLib is an optional support library for the Automatic Storage Management feature of the Oracle Database. ASMLib allows an Oracle Database using ASM more efficient and capable access to the disk groups it is using.
Q8. As a system administrator, you run the system-config-network tool and make changes to the configuration. You change the hostname and the DNS search path settings. Which two files will these changes be written into?
A. “/etc/sysconfig/network” and “/etc/resolv.conf” files
B. “/etc/sysconfig/network” and “etc/nsswitch.conf/” files
C. “/etc/sysconfig/netconfig” and “/etc/resolv.conf” files
D. “etc/sysconfig/network-scripts/network” and “/etc/resolv.conf” files
Explanation: The system-config-network-tui and system-config-network commands start a text-based network configuration tool.
Navigate using the "tab", "arrow" and "return" keys. The "Device configuration" option gives a list of network devices.
Selecting the device allows you to edit the adapter's network configuration, which is saved to the "/etc/sysconfig/network-scripts/ifcfg-eth0" file.
The "DNS configuration" option on the first screen allows you to modify the configuration in the "/etc/sysconfig/network" and "/etc/resolv.conf" files.
Q9. As user bob, you have logged in to the system on a terminal and issued the following command to make the top command run in the background.
[bob@host - ] top& You exit from the terminal and log back as bob into the system at the same terminal. How is the background job affected?
A. The background job gets the foreground as soon as bob logs into the system.
B. The background job is suspended temporarily from the job and resumes when user bob logs back in to the system.
C. The background job starts running in the background again as soon as bob logs into the system.
D. The background job will not be affected.
E. The background job is deleted from the job pool and does not get listed using jobs command.
Q10. You want to allow multiple users the write access to files within the same directory, in addition, you want all the new files created in this directory to be of the required group instead of the primary ID of the user who creates the file. How do you accomplish this?
A. Set the setgid bit on the directory.
B. Change the group owner of the new files manually.
C. Run a cron job to change the group owner.
D. Changethe primary group ID of every user to the required group.
Explanation: Linux: SETGID on directory
SETGID stands for SET Group ID. We can use the command chmod to set the group ID bit for a directory. chmod g+s mydir or with numeric mode: chmod 2775 mydir After the change, the permission of the directory "mydir" becomes "drwxrwsr-x". drwxrwsr-x 3 zen zen 4096 2010-03-18 19:57 mydir But what is so special about setting the group ID for a directory? The trick is that when another user creates a file or directory under such a directory "mydir", the new file or directory will have its group set as the group of the owner of "mydir", instead of the group of the user who creates it. For example, if user2 belongs to the groups "user2" (main group) and "zen", and he creates a file "newfile" under the diretory "mydir", "newfile" will be owned by the group of "zen" instead of user2's main group ID "user2".