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Oracle Linux 6 Implementation Essentials

Question No: 41

What does the following line in the modprobe.conffile indicate?

options netconsole

netconsole = 6666@192.168.1.200/eth0, 514@192.168.1.100/00:0C:A3:35:9C

  1. Netconsole logging is set up to send messages to a server at the IP address 192.168.1.200 by using the eth0 device.

  2. Netconsole logging is set up to send messages to a server at the IP address 192.168.1.200 by using the port number 6666.

  3. Netconsole logging is set up to send messages to a server at IP address 192.168.1.200 by using the UDP port 514.

  4. Netconsole logging is set up for two clients with IP addresses of 192.168.1.200 and 192.168.1.100 on this server.

Answer: B Explanation: Example: options netconsole

netconsole=6666@10.0.0.1/eth0,514@10.0.0.2/00:1A:A0:D2:55:66

Explanation

6666=gt; Server source port

10.0.0.1 =gt; Server IP

eth0 =gt; Server NIC 514=gt; Client listening port

10.0.0.2 =gt; Client IP 00:1A:A0:D2:55:66 =gt; Client MAC

Question No: 42

The /proc file system is a pseudo-file system, which is used as an interface to kernel data structures. Which four statements are true about the /proc file system?

  1. The /proc file system contains a numerical subdirectory for each running process.

  2. The /proc file system contains a hierarchy of special files that represent the current state of the kernel.

  3. The /proc file system has to be mounted by the system administrator after a reboot.

  4. The /proc/cpuinfo virtual file identifies the type of processor used by your system.

  5. The /proc directory contains information about system hardware and any running processes.

  6. The files in the /proc directory are read-only system files that cannot be changed.

Answer: A,B,D,E

Explanation: *The /proc file system exists in slightly different variations on Linux and the Solaris OS. On both systems, /proc is a directory containing files whose names are the process IDs of the current active processes on the system(A). Each PID-named file is in turn a directory. /proc on Linux has various other directories besides processes. Most of these deal with processors, devices, and statistics on the system. On Linux, one looks in

/proc to find information about processes, processors, devices, machine architecture, and so on(E).

*The /proc is a virtual file system that contains files that show the status of the Linux operating system kernel. Most of the files have a size of 0 bytes, but they actually contain a large amount of data. The timestamps of these virtual files changes as the contents of the files are updated by the OS.

*The following virtual files provide an indication, at the moment they are being viewed, about the system hardware:

n /proc/partitions: Gives the size and name of partitions n /proc/meminfo: Memory statistics and segment sizes

n /proc/mounts: List of the mount points n /proc/uptime: Uptime of the system

n /proc/interrupts: List of interrupts on the system

D:The contents of the files can be seen with the classical command cat, thereby viewing the information of the CPU.

linux-mlpb:~ # cat /proc/cpuinfo processor : 0

vendor_id : GenuineIntel cpu family : 6

model : 9

model name : Intel(R) Pentium(R) M processor 1700MHz stepping : 8

cpu MHz : 1694.501

cache size : 1024 KB fdiv_bug : no

hlt_bug : no f00f_bug : no coma_bug : no fpu : yes

fpu_exception : yes cpuid level : 2

wp : yes

flags : fpu vme de pse tsc msr mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 up pebs bts

bogomips : 3408.43 clflush size : 64

linux-mlpb:~ # cat /proc/cpuinfo processor : 0

vendor_id : GenuineIntel cpu family : 6

model : 9

model name : Intel(R) Pentium(R) M processor 1700MHz stepping : 8

cpu MHz : 1694.501

cache size : 1024 KB fdiv_bug : no

hlt_bug : no f00f_bug : no coma_bug : no fpu : yes

fpu_exception : yes cpuid level : 2

wp : yes

flags : fpu vme de pse tsc msr mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 up pebs bts

bogomips : 3408.43 clflush size : 64

Question No: 43

You have kdump service enabled on your Oracle Linux system and experience a kernel crash. The crash dump file is created on your system, but you are not aware where this crash file was created. Which two places can you find the path information where the crash dump file is being generated on your system?

  1. Check the settings in the /etc/kdump.conf file.

  2. Check the settings in the /etc/sysconfig/kdump.conf file.

  3. Check the target settings by running the system-config-kdump command.

  4. Check the settings in the /proc/sys/kernel/crash.conf file.

Answer: A,C

Explanation: A:When a kernel crash is captured, the core dump can be either stored as a file in a local file system, written directly to a device, or sent over a network using the NFS (Network File System) or SSH (Secure Shell) protocol. Only one of these options can be set at the moment, and the default option is to store the vmcore file in the /var/crash/ directory of the local file system. To change this, as root, open the /etc/kdump.conf configuration file in a text editor and edit the options.

C:You can use the system-config-kdump GUI to setup Kdump:

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Question No: 44

As a root user, you executed the following command on your Oracle Linux 6 server: [root@host] # strace – o/tmp/diag.out sh diag.sh

Which statement describes the purpose of this command?

  1. It collects the memory and swap space metrics when the diag.sh scripts runs.

  2. It collects the operating system metrics when the diag.sh script runs.

  3. It records the memory usage and CPU usage information of the processes when the diah.sh script runs.

  4. It records the system calls, which are called by the processes when the diag.sh script runs.

Answer: D

Explanation: *strace – trace system calls and signals

In the simplest case strace runs the specified command until it exits. It intercepts and records the system calls which are called by a process and the signals which are received by a process. The name of each system call, its arguments and its return value are printed on standard error or to the file specified with the -o option.

*strace is a useful diagnostic, instructional, and debugging tool. System administrators, diagnosticians and trouble-shooters will find it invaluable for solving problems with programs for which the source is not readily available since they do not need to be recompiled in order to trace them. Students, hackers and the overly-curious will find that a great deal can be learned about a system and its system calls by tracing even ordinary programs. And programmers will find that since system calls and signals are events that happen at the user/kernel interface, a close examination of this boundary is very useful for bug isolation, sanity checking and attempting to capture race conditions.

Each line in the trace contains the system call name, followed by its arguments in parentheses and its return value. An example from stracing the command #39;#39;cat /dev/null#39;#39; is:

open(quot;/dev/nullquot;, O_RDONLY) = 3

Errors (typically a return value of -1) have the errno symbol and error string appended. open(quot;/foo/barquot;, O_RDONLY) = -1 ENOENT (No such file or directory)

Signals are printed as a signal symbol and a signal string. An excerpt from stracing and interrupting the command #39;#39;sleep 666#39;#39; is:

sigsuspend([] lt;unfinished …gt;

— SIGINT (Interrupt) —

killed by SIGINT Reference: man strace

Question No: 45

The Oracle “helper” package (RPM), formerly known as “Oracle-validated” (which helps meet prerequisites for installing Oracle software), has been renamed. What is the new name?

  1. Oracle-11gR2-validated

  2. Oracle-11fR2-valid_package

  3. Oracle-rdbms-server-11gR2-preinstall

  4. Oracle-11gR2-preinstall

Answer: C

Explanation: Now that the certification of the Oracle Database 11g R2 with Oracle Linux 6 and the Unbreakable Enterprise Kernel has been announced, we are glad to announce the availability oforacle-rdbms-server-11gR2-preinstall, the Oracle RDBMS Server 11gR2 Pre- install RPM package (formerly known as oracle-validated). Designed specifically for Oracle Linux 6, this RPM aids in the installation of the Oracle Database.

Reference:Oracle RDBMS Server 11gR2 Pre-Install RPM for Oracle Linux 6 has been released

Question No: 46

View the exhibit.

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Examine the grub.conf file snippet in the Exhibit. Which statement is true if your Linux system boots by using this grub.conf file?

  1. GRUB will boot, by default, the first kernel entry of this grub.conf file.

  2. GRUB will prompt you to select the kernel to be booted because the default parameter is set to 0.

  3. GRUB will boot the kernel specified in the inittab file of the system.

  4. GRUB will boot, by default, the second kernel entry of this grub.conf file.

Answer: A

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

Question No: 47

Which two statements describes the capabilities of Oracle Manager Ops Center product?

  1. Oracle Enterprise Manager Ops Center can provide management services for Oracle Linux servers.

  2. Oracle Enterprise Manager Ops Center provides management services only for Oracle Solaris operating system and SPARC servers.

  3. Oracle Enterprise Manager Ops Center contains tools to debug Oracle Linux kernel dump files.

  4. Oracle Enterprise Manager Ops Center includes built-in integration with My Oracle Support with automatic servers request generation.

Answer: A,D

Explanation: Oracle Enterprise Manager Ops Center 12c is a foundational offering in the Oracle Enterprise Manager 12c solution. It introduces unique capabilities to strengthen Oracle Enterprise Manager 12c’s ability to establish, manage, and support enterprise quality clouds delivered in an Infrastructure-as-a-Service model. With the launch of Oracle Enterprise Manager Ops Center 12c, Oracle Systems’ customers utilizing SPARC, X86, Oracle Solaris, Oracle Linux(A), Oracle ZFS Storage Appliance, Oracle Switches, and both Oracle VM technologies can accelerate private cloud adoption faster at a lower cost.

Oracle Enterprise Manager Ops Center 12c provides a comprehensive solution for operating system, firmware and BIOS configuration, bare metal and virtual machine provisioning, hardware fault analysis, automatic My Oracle Support service request generation(D), performance management, all while leveraging integrated diagnostics with

automatic server pool resource policies.

Question No: 48

Which two utilities can you use to manipulate the partition table on Oracle Linux?

  1. fdisk

  2. format

  3. chkdsk

  4. parted

  5. system-config-disk

Answer: A,D

Explanation: A:fdisk – Partition table manipulator for Linux

D:If you do have a choice of using a disk label/partition tool during installation – for example, the parted tool during Oracle Solaris live image installation – use a tool that allows alignment by

sector. This means you can specify a partition start and end using a sector number.

Incorrect

Not C: chkdsk is not a linux command.

Question No: 49

Your 32-bit i686 architecture system in registered with the Oracle Unbreakable Linux Network. RPM package example -1 .0.0-1 is already installed and the application is used constantly. You want to download the latest version of the example RPM package. You do not want to install the package until you have coordinated with the program’s current users. Which option will allow you to download until you have coordinated with the program’s current users. Which option will allow you to download the latest version of the RPM package, but not install it?

  1. # rpm -Uvh http://linix.oracle.com/rpms/i686/example-1.0.1-1.i686.rpm

  2. # yum -no-update example

  3. # yumdownloader example

  4. # yum -get example-1.0.1

Answer: C

Explanation: yumdownloader is a program for downloading RPMs from Yum repositories.

Synopsis

yumdownloader [options] package1 [package2…]

Note:

*yum – Yellowdog Updater Modified

yum is an interactive, rpm based, package manager. It can automatically perform system updates, including dependency analysis and obsolete processing based on quot;repositoryquot; metadata. It can also perform installation of new packages, removal of old packages and perform queries on the installed and/or available packages among many other commands/services (see below). yum is similar to other high level package managers like apt-get and smart.

Question No: 50

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?

  1. “/etc/sysconfig/network” and “/etc/resolv.conf” files

  2. “/etc/sysconfig/network” and “etc/nsswitch.conf/” files

  3. “/etc/sysconfig/netconfig” and “/etc/resolv.conf” files

  4. “etc/sysconfig/network-scripts/network” and “/etc/resolv.conf” files

Answer: C

Explanation: The system-config-network-tui and system-config-network commands start a text-based network configuration tool.

Navigate using the quot;tabquot;, quot;arrowquot; and quot;returnquot; keys. The quot;Device configurationquot; option gives a list of network devices.

Selecting the device allows you to edit the adapter#39;s network configuration, which is saved to the quot;/etc/sysconfig/network-scripts/ifcfg-eth0quot; file.

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