Enterprise Linux System Administration – LIVE REMOTE ONLY - GL250 Course Outline

(5 Days)

Overview

The GL250 is an in-depth course that explores installation, configuration and maintenance of Linux systems. The course focuses on issues universal to every workstation and server. The course material is designed to provide extensive hands-on experience. Topics include: installation and configuration; the boot process; user and group administration; filesystem administration, including quotas, FACLs, RAID and LVM; task automation; client networking; SELinux; software management; log files; troubleshooting; and more.

Prerequisites

Students should already be comfortable working in a Linux or Unix environment. Fundamentals such as the Linux filesystem, process management, and how to edit files will not be covered in class. An understanding of network concepts, and the TCP/IP protocol suite is helpful. These skills are taught in the GL120

Linux Fundamentals

course.

Course Outline

Course Content

Lesson 1: Linux Kernel & Devices

  • Hardware Discovery Tools
  • Kernel Hardware Info – /sys/
  • /sys/ Structure
  • udev
  • Managing Linux Device Files
  • List Block Devices
  • SCSI Devices
  • USB Devices
  • USB Configuration
  • Kernel Modules
  • Configuring Kernel Components and Modules
  • Handling Module Dependencies
  • Configuring the Kernel via /proc/
  • Console
  • Virtual Terminals
  • Serial Ports

Lesson 2: Boot Process & SysV Init

  • systemd System and Service Manager
  • systemd Targets
  • Using systemd
  • Legacy Support for SysV init
  • Booting Linux on PCs
  • GRUB 2
  • GRUB2 Configuration
  • GRUB2 Security
  • Boot Parameters
  • Initial RAM Filesystem
  • init
  • System Init Styles Overview
  • Linux Runlevels Aliases
  • Systemd local-fs.target and sysinit.target
  • Systemd basic.target and multi-user.target
  • Legacy local bootup script support
  • System Configuration Files
  • RHEL7 Configuration Utilities
  • Shutdown and Reboot

Lesson 3: Software Maintenance

  • Managing Software
  • RPM Features
  • RPM Architecture
  • RPM Package Files
  • Working With RPMs
  • Querying and Verifying with RPM
  • Updating the Kernel RPM
  • Dealing With RPM & YUM Digest Changes
  • Yum Plugins & RHN Subscription Manager
  • YUM Repositories
  • YUM Repository Groups
  • Compiling/Installing from Source
  • Manually Installed Shared Libraries
  • Rebuilding Source RPM Packages

Lesson 4: Local Storage Administration

  • Partitioning Disks with fdisk
  • Partitioning Disks with parted
  • Filesystem Creation
  • Persistent Block Devices
  • Mounting Filesystems
  • Resizing Filesystems
  • Filesystem Maintenance
  • Managing an XFS Filesystem
  • Swap
  • Filesystem Structures
  • Determining Disk Usage With df and du
  • Configuring Disk Quotas
  • Setting Quotas
  • Viewing and Monitoring Quotas
  • Filesystem Attributes

Lesson 5: LVM & RAID

  • Logical Volume Management
  • Implementing LVM
  • Creating Logical Volumes
  • Manipulating VGs & LVs
  • Advanced LVM Concepts
  • gnome-disk-utility
  • RAID Concepts
  • Array Creation with mdadm
  • Software RAID Monitoring
  • Software RAID Control and Display

Lesson 6: Remote Storage Administration

  • Remote Storage Overview
  • Remote Filesystem Protocols
  • Remote Block Device Protocols
  • File Sharing via NFS
  • NFSv4
  • NFS Clients
  • NFS Server Configuration
  • Implementing NFSv4
  • AutoFS
  • AutoFS Configuration
  • Accessing Windows/Samba Shares from Linux
  • SAN Multipathing
  • Multipath Configuration
  • Multipathing Best Practices
  • iSCSI Architecture
  • Open-iSCSI Initiator Implementation
  • iSCSI Initiator Discovery
  • iSCSI Initiator Node Administration
  • Mounting iSCSI Targets at Boot
  • iSCSI Multipathing Considerations

Lesson 7: User/Group Administration

  • User and Group Concepts
  • User Administration
  • Modifying Accounts
  • Group Administration
  • Password Aging
  • Default User Files
  • Controlling Logins
  • system-config-authentication
  • System Security Services Daemon (SSSD)

Lesson 8: Pluggable Authentication Modules (PAM)

  • PAM Overview
  • PAM Module Types
  • PAM Order of Processing
  • PAM Control Statements
  • PAM Modules
  • pam_unix
  • so
  • so
  • so
  • so

Lesson 9: Security Administration

  • Security Concepts
  • Tightening Default Security
  • Security Advisories
  • File Access Control Lists
  • Manipulating FACLs
  • Viewing FACLs
  • Backing Up FACLs
  • File Creation Permissions with umask
  • User Private Group Scheme
  • Alternatives to UPG
  • SELinux Security Framework
  • SELinux Modes
  • SELinux Commands
  • Choosing an SELinux Policy
  • SELinux Booleans
  • Permissive Domains
  • SELinux Policy Tools
  • Basic Firewall Activation

Lesson 10: Basic Networking

  • IPv4 Fundamentals
  • TCP/UDP Fundamentals
  • Linux Network Interfaces
  • Ethernet Hardware Tools
  • Network Configuration with ip Command
  • Configuring Routing Tables
  • IP to MAC Address Mapping with ARP
  • Starting and Stopping Interfaces
  • NetworkManager
  • DNS Clients
  • DHCP Clients
  • Network Diagnostics
  • Information from ss and netstat
  • Hardware and System Clock
  • Managing Network-Wide Time
  • Continual Time Sync with NTP
  • Configuring NTP Clients
  • Useful NTP Commands

Lesson 11: Advanced Networking

  • Multiple IP Addresses
  • Configuring a DHCP server
  • Enabling IPv6
  • Interface Bonding
  • Interface Bridging
  • 1q VLANS
  • Tuning Kernel Network Settings

Lesson 12: Log File Administration

  • System Logging
  • Systemd Journal
  • gnome-system-log
  • Rsyslog
  • /etc/rsyslog.conf
  • Log Management/ Anomaly Detector

Lesson 13: Monitoring & Troubleshooting

  • System Status – Memory, I/O, CPU
  • Performance Trending with sar
  • Determining Service to Process Mapping
  • Realtime Monitoring of Resources — Cgroups
  • Troubleshooting Basics: The Process
  • Troubleshooting Basics: The Tools
  • strace and ltrace
  • Common Problems
  • Troubleshooting Incorrect File Permissions
  • Inability to Boot
  • Typos in Configuration Files
  • Corrupt Filesystems
  • RHEL7 Rescue Environment

Lesson 14: Pre-Installation Considerations

  • Pre-Installation Considerations
  • Hardware Compatibility
  • Multi-OS Booting
  • Partition Considerations
  • Filesystem Planning
  • Selecting a Filesystem

Lesson 15: Installing RHEL7

  • Anaconda: An Overview
  • Anaconda: Booting the System