Oracle Linux 8: System Administration I

Course Introduction

• Course Objectives
• Course Schedule
• Objectives
• Virtualization with Oracle VM Server for x86
• Oracle VM Server for x86 in the Classroom
• Working with Classroom Virtual Machines
• Summary
• Practice 1: Overview

Introduction to Oracle Linux

• Objectives
• Linux Kernel
• The GNU Project
• GNU General Public License (GPL)
• Linux Kernel Development Model
• Continuous Mainline Kernel Development
• Linux Distributions
• Oracle Linux
• Oracle’s Technical Contributions to Linux
• Compatibility with Red Hat Enterprise Linux (RHEL)
• Oracle Linux Release/Update Targets
• The Unbreakable Enterprise Kernel (UEK)
• DTrace
• Btrfs File System
• Oracle Linux Release Notes
• Quiz
• Summary
• Practice 2: Overview

Installing Oracle Linux 8

• Objectives
• Obtaining Oracle Linux
• Oracle Software Delivery Cloud
• Anaconda Installer
• Oracle Linux Installation Menu
• Boot Options
• Welcome to Oracle Linux
• Installation Summary
• Time and Date Configuration
• NTP Configuration
• Keyboard Layout
• Language Support
• Software Installation Source
• Selecting the Software to Install
• Installation Destination
• Automatic Partitioning
• Manual Partitioning
• Summary of Partitioning
• Network and Host Name Configuration
• Network Connection Settings
• Security Policy
• KDUMP
• Setting the root Password
• Creating an Initial User
• Perform the Installation
• Initial Setup
• GUI Login Window
• Quiz
• Summary

OpenSSH

• Objectives
• OpenSSH: Introduction
• OpenSSH Configuration Files
• OpenSSH Configuration
• Using OpenSSH Utilities
• Using the ssh Command
• Using the scp Command
• Using the sftp Command
• Using the ssh-keygen Command
• Using ssh-agent
• Quiz
• Summary
• Practice 4: Overview

The GRUB Bootloader

• Objectives
• Oracle Linux Boot Sequence
• Boot Mode: BIOS or UEFI
• BIOS Boot with the Master Boot Record (MBR)
• Globally Unique Identifier (GUID) Partition Table: GPT
• GPT Layout
• Disk Layout and File System Differences with UEFI
• The efibootmgr Utility
• Secure Boot with UEFI
• GRUB 2 Bootloader Configuration
• The /etc/default/grub File
• Kernel Boot Parameters
• Boot Loader Specification
• GRUB 2 Configuration File
• Boot Loader Entry
• GRUB 2 Menu
• Editing a GRUB 2 Menu Option
• GRUB 2 Command Line
• Setting the Default Kernel
• The Initial RAM File System
• Adding Kernel Modules to an initramfs File
• Quiz
• Summary
• Practice 5: Overview

Introduction to systemd

• Objectives
• systemd Introduction
• systemd Units
• systemd Target Units
• System State Commands
• Working with the Default Target
• Rescue and Emergency Mode
• systemd Service Units
• Enabling and Disabling Services
• Starting, Stopping, and Restarting Services
• Checking the Status of a Service
• Displaying the Status of Services
• The Service Unit File
• The [Unit] Section
• The [Install] Section
• The [Service] Section
• The /etc/sysconfig Directory
• Overriding Service Unit Files
• systemd Socket Units
• Quiz
• Summary
• Practice 6: Overview

Managing Time

• Objectives
• Configuring System Date and Time During Installation
• Configuring System Date and Time from the Command Line
• Using the timedatectl Utility
• Using Network Time Protocol
• Configuring NTP by Using Chrony
• Automating System Tasks
• The cron Command Scheduler
• Configuring cron Jobs
• The crontab Utility for User Tasks
• Using anacron for Less Frequent Tasks
• Configuring anacron Jobs
• Configuring systemd Timers
• Checking Timer Status
• Quiz
• Summary
• Practice 7: Overview

Kernel and Device Configuration

• Objectives
• Loadable Kernel Modules (LKM)
• Loading and Unloading Kernel Modules
• Kernel Module Parameters
• The proc File System
• Accessing Files in the proc File System
• Top-Level Files in /proc
• Process Directories in /proc
• Other Directories in /proc
• The /proc/sys Directory
• The sysctl Utility
• The sysfs File System
• The lshw Utility
• Creating the /dev Directory
• udev Rule Files and Directories
• Sample udev Rules
• The udevadm Utility
• Creating a Symbolic Link to a Device Node
• Quiz
• Summary
• Practice 8: Overview

Package Management

• Objectives
• Package Management: Introduction
• Using Query Options with the rpm Utility
• Using rpm to Install, Update, or Remove Packages
• Oracle Linux Yum Server
• The dnf Configuration
• Repository Configuration Files
• Available yum Repository Configurations
• Locating Packages with the dnf Utility
• Using dnf to Install, Upgrade, or Remove Packages
• dnf Groups
• Managing dnf repositories
• DNF Modules and Application Stream
• Displaying Available Modules
• Selecting a Module
• Enabling Modules
• Installing Modules
• Removing Installed Modules
• DNF Security Options
• DNF Automatic Tool
• Unbreakable Linux Network (ULN)
• ULN Channels
• Registering Your System with ULN
• Switching A RHEL 8 System from RHN to ULN
• Quiz
• Summary
• Practice 9: Overview

Oracle Ksplice

• Objectives
• Oracle Ksplice: Introduction
• Ksplice Addresses System Administrator Challenges
• Ksplice: Features and Benefits
• Ksplice Patching
• Ksplice for Diagnosing Issues
• Ksplice Track Record
• Ksplice Case Study
• How Ksplice Works
• Online Ksplice Implementations
• Offline Ksplice Implementations
• Implementing the Ksplice Online Standard Client
• Subscribing to the Ksplice Channel
• Ksplice Packages on ULN
• Using Ksplice Uptrack
• Ksplice Uptrack Command Summary
• Ksplice Web Interface: System Status
• Ksplice Web Interface: System Status Detail
• The Ksplice Offline Standard Client
• Modifying a Local Yum Server to Act as a Ksplice Mirror
• Updating a Local Yum Server with Ksplice Channels
• Configuring Offline Standard Client to Use the Local Mirror
• The Ksplice Enhanced Client
• Implementing the Ksplice Online Enhanced Client
• Managing the Ksplice Enhanced Client
• Configuring Offline Enhanced Client to Use a Local Mirror
• Quiz
• Summary
• Practice 10: Overview

User and Group Administration

• Objectives
• Introduction to Users and Groups
• User and Group Configuration Files
• Adding a User Account
• Modifying or Deleting User Accounts
• Group Account Administration
• User Private Groups
• Password Configuration
• The /etc/login.defs File
• Restricting Use of the su Command
• Allowing Use of the sudo Command
• User/Group Administration in the Enterprise
• Quiz
• Summary
• Practice 11: Overview

Partitions, File Systems, and Swap

• Objectives
• Disk Partitions
• Partition Layout: Example Using MS-DOS Partitioning
• Viewing and Refreshing the Partition Tables
• Partition Table Manipulation Utilities
• The fdisk Utility
• Using the fdisk Utility
• The cfdisk Utility
• The parted Utility
• File System Types
• Making File Systems
• Mounting File Systems
• Maintaining File Systems
• Swap Space
• The /etc/fstab File
• Quiz
• Summary
• Practice 12: Overview

Network Configuration

• Objectives
• NetworkManager
• Connection Profiles
• Connection Profile File Names
• Network Interface File Parameters
• Additional Network Configuration Files
• The ethtool Utility
• Running Custom Network Scripts
• The nmcli Utility
• The nmcli general Object
• The nmcli networking Object
• The nmcli radio Object
• The nmcli connection Object
• The nmcli connection show Command
• nmcli connection up|down Commands
• The nmcli connection add Command
• The nmcli connection edit Command
• The nmcli connection modify Command
• nmcli connection delete | reload | load Commands
• The nmcli device Object
• The nmtui Utility
• The ip Utility
• The ip addr Object
• The ip link Object
• Address Resolution Protocol (ARP)
• The ip route Object
• NetworkManager and the Routing Table
• Quiz
• Summary
• Practice 13: Overview

Network Security

• Objectives
• Packet-Filtering Firewalls
• Introduction to firewalld
• Zones
• firewalld Zones
• Predefined firewalld Zones
• Setting the Default firewalld Zone
• firewalld Services
• The firewall-cmd Utility
• Starting firewalld
• Configuring firewalld
• Creating Advanced Firewall Configurations
• Ruleset, Tables, and Chains
• An Example
• Getting a Handle
• Making nftables Configuration Permanent
• Quiz
• Summary
• Practice 14: Overview

Oracle on Oracle

• Objectives
• Oracle Preinstall RPM
• Oracle Software User Accounts
• Oracle Software Group Accounts
• Oracle Automatic Storage Management (ASM) Groups
• System Resource Tuning
• Linux Shared Memory
• Semaphores
• Network Tuning
• Setting the File Handles Parameter
• Asynchronous I/O (AIO)
• Oracle-Related Shell Limits
• HugePages
• Configuring HugePages
• Oracle ASM
• ASM Library Driver (ASMLib)
• Using ASMLib Commands
• ASM Filter Driver (ASMFD)
• Quiz
• Summary
• Practice 15: Overview

System Monitoring and Management

• Objectives
• sosreport Utility
• iostat Utility
• mpstat Utility
• vmstat Utility
• sar Utility
• top Utility
• iotop Utility
• strace Utility
• ss Utility
• tcpdump Utility
• Capturing Packets with the tcpdump Utility
• Wireshark
• tshark
• OSWatcher (OSWbb)
• Using the RPM Version of OSWatcher
• Using the MOS Version of OSWatcher
• OSWbb Diagnostic Data Output
• OSWatcher Analyzer (OSWbba)
• Analyzing OSWbb Archive Files
• Oracle Enterprise Manager Cloud Control
• Oracle Enterprise Manager Cloud Control Components
• Oracle Enterprise Manager Cloud Control GUI Sections
• Oracle EM Cloud Control: Enterprise Summary
• Oracle EM Cloud Control: Oracle Linux Home
• Oracle Linux Manager: Overview
• Oracle Linux Manager: Features and Functionality
• Oracle Linux Manager Web Interface: Overview Page
• Using Cockpit to Manage Oracle Linux
• Activating Cockpit
• Cockpit User Interface
• Quiz
• Summary
• Practice 16: Overview

System Logging

• Objectives
• System Logging: Introduction
• rsyslog Configuration
• rsyslog Filter Options
• Facility/Priority Selectors
• rsyslog Actions
• rsyslog Templates
• Configuring Log Rotation (logrotate)
• The logwatch Utility
• The systemd-journald Journal File
• The journalctl Utility
• Journal Metadata
• Quiz
• Summary
• Practice 17: Overview

Troubleshooting

• Objectives
• Two-Phased Approach to Troubleshooting
• Gathering Information
• Operating System Logs
• dmesg Utility
• Troubleshooting Resources
• My Oracle Support
• Causes of Common Problems
• Troubleshooting Boot Problems
• Quiz
• Summary
• Practice 18: Overview