Oracle 1z0-821 - Oracle Solaris 11 System Administration

'ipadm show-addr' displays all the configured addresses on the system.

Example:

# ipadm show-addr

ADDROBJ TYPE STATE ADDR

lo0/v4 static ok 127.0.0.1/8

lo0/v6 static ok ::1/128

A: The beadm utility includes support for creating and administering non-global zone boot environments.

Note: A boot environment is a bootable instance of the Oracle Solaris operating system image plus any other application software packages installed into that image. System administrators can maintain multiple boot environments on their systems, and each boot environment can have different software versions installed.

B: Role-based access control (RBAC) is a security feature for controlling user access to tasks that would normally be restricted to the root role. By applying security attributes to processes and to users, RBAC can divide up superuser capabilities among several administrators.

Part of the job of cleaning up heavily loaded file systems involves locating and removing files that have not been used recently. You can locate unused files by using the ls or find commands.

Other ways to conserve disk space include emptying temporary directories such as the directories located in /var/tmp or /var/spool, and deleting core and crash dump files.

Note: Core files are generated when a process or application terminates abnormally. Core files are managed with the coreadm command.

For example, you can use the coreadm command to configure a system so that all process core files are placed in a single system directory. This means it is easier to track problems by examining the core files in a specific directory whenever a process or daemon terminates abnormally.

Unlike DOS, which uses the file extension to determine if a file is executable or not, UNIX relies on file permissions.

The value assigned by umask is subtracted from the default.

User's file creation mask. umask sets an environment variable which automatically sets file permissions on newly created files. i.e. it will set the shell process's file creation mask to mode.

umask 000 would grant full permissions.

Note: 777 full permissions

A: You can configure Common Multiprotocol SCSI TARget, or COMSTAR, a software framework that enables you to convert any Oracle Solaris 11 host into a SCSI target device that can be accessed over a storage network by initiator hosts.

This means you can make storage devices on a system available to Linux, Mac OS, or Windows client systems as if they were local storage devices. Supported storage protocols are iSCSI, FC, iSER, and SRP.

B: iSCSI targets cannot be configured as dump devices.

Single quotes are most strict. They prevent even variable expansion. Double quotes prevent wildcard expansion but allow variable expansion. For example:

#!/bin/sh

echo $SHELL

echo "$SHELL"

echo '$SHELL'

This will print:

/usr/bin/bash

/usr/bin/bash

$SHELL

The /etc/passwd file contains basic user attributes. This is an ASCII file that contains an entry for each user. Each entry defines the basic attributes applied to a user.

/etc/shadow file stores actual password in encrypted format for user's account with additional properties related to user password i.e. it stores secure user account information. All fields are separated by a colon (:) symbol. It contains one entry per line for each user listed in /etc/passwd file.

OpenBoot firmware is executed immediately after you turn on your system. The primary tasks of OpenBoot firmware are to:

* Test and initialize the system hardware (B)

* Determine the hardware configuration

*Boot the operating system from either a mass storage device or from a network (C)

*Provide interactive debugging facilities for testing hardware and software

You might need to replace a disk in the root pool for the following reasons:

The root pool is too small and you want to replace it with a larger disk

The root pool disk is failing. In a non-redundant pool, if the disk is failing so that the system won't boot, you'll need to boot from an alternate media, such as a CD or the network, before you replace the root pool disk.

In a mirrored root pool configuration, you might be able to attempt a disk replacement without having to boot from alternate media. You can replace a failed disk by using the zpool replace command.

Some hardware requires that you offline and unconfigure a disk before attempting the zpool replace operation to replace a failed disk.

For example:

# zpool offline rpool c1t0d0s0

# cfgadm -c unconfigure c1::dsk/c1t0d0

# cfgadm -c configure c1::dsk/c1t0d0

# zpool replace rpool c1t0d0s0

# zpool online rpool c1t0d0s0

# zpool status rpool

SPARC# installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c1t0d0s0

x86# installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c1t9d0s0