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GL942 - Enterprise Linux Systems Administration

Upcoming GL942 Classes

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This course 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 Apache/Tomcat

Current Version: A00

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

Supported Distributions:

Red Hat Enterprise Linux 6

Course Outline:

  1. Linux Hardware Discovery, Interaction, and Control
    1. Hardware Discovery Tools
    2. Hardware and System Clock
    3. Console
    4. Virtual Terminals
    5. Serial Ports
    6. SCSI Devices
    7. USB Devices
    8. USB Configuration
    9. Common UNIX Printing System
    10. Defining a Printer
    11. Managing Optical Media
    12. Tape Libraries
    13. Managing Linux Device Files
    14. Kernel Hardware Info – /sys/
    15. /sys/ Structure
    16. udev
    17. Kernel Modules
    18. Configuring Kernel Components and Modules
    19. Handling Module Dependencies
    20. Configuring the Kernel via /proc/
    Lab Tasks
    1. Adjusting Kernel Options
    2. Configuring Print Queues
    3. Introduction to Troubleshooting Labs
    4. Troubleshooting Practice: Kernel Modules
  2. Boot Process and SysV Init
    1. Booting Linux on PCs
    2. GRUB Configuration
    3. Boot Parameters
    4. Initial ramdisk
    5. /sbin/init
    6. System Init Styles
    7. Linux Runlevels
    8. /etc/inittab
    9. /etc/rc.d/rc.sysinit
    10. Runlevel Implementation
    11. System Configuration Files
    12. RHEL6 Configuration Utilities
    13. Typical SysV Init Script
    14. The /etc/rc.local File
    15. Managing Daemons
    16. Controlling Service Startup
    17. Shutdown and Reboot
    Lab Tasks
    1. Boot Process
    2. GRUB Command Line
    3. Basic GRUB Security
    4. Managing Services With chkconfig
    5. Troubleshooting Practice: Boot Process
  3. Software Maintenance
    1. Managing Software
    2. RPM Features
    3. RPM Architecture
    4. RPM Package Files
    5. Working With RPMs
    6. Querying and Verifying with rpm
    7. Updating the Kernel RPM
    8. Dealing With RPM & YUM Digest Changes
    9. Yum Plugins
    10. YUM Repositories
    11. YUM Repository Groups
    12. Compiling/Installing from Source
    13. Manually Installed Shared Libraries
    14. Installing Source RPM Packages
    Lab Tasks
    1. Managing Software with RPM
    2. Creating a Custom RPM Repository
    3. Querying the RPM Database
    4. Installing Software via RPM & Source and Rebuilding SRPMs
  4. Filesystem Administration
    1. Partitioning Disks with fdisk
    2. Partitioning Disks with parted
    3. Filesystem Creation
    4. Mounting Filesystems
    5. Filesystem Maintenance
    6. Persistent Block Devices
    7. Resizing Filesystems
    8. Swap
    9. Filesystem Structures
    10. Determining Disk Usage With df and du
    11. Configuring Disk Quotas
    12. Setting Quotas
    13. Viewing and Monitoring Quotas
    14. Filesystem Attributes
    15. Backup Software
    16. Backup Examples
    Lab Tasks
    1. Creating and Managing Filesystems
    2. Hot Adding Swap
    3. Setting User Quotas
    4. Using rsync and ssh for Backups
    5. Using tar and cpio for Backups
    6. Using dump and restore for Backups
    7. Creating ISO Images for Backups
  5. LVM & RAID
    1. Logical Volume Management
    2. Implementing LVM
    3. Creating Logical Volumes
    4. Manipulating VGs & LVs
    5. Advanced LVM Concepts
    6. system-config-lvm
    7. RAID Concepts
    8. Array Creation with mdadm
    9. Software RAID Monitoring
    10. Software RAID Control and Display
    Lab Tasks
    1. Creating and Managing LVM Volumes
    2. Creating and Managing a RAID-5 Array
  6. Remote Storage Administration
    1. Remote Storage Overview
    2. Remote Filesystem Protocols
    3. Remote Block Device Protocols
    4. File Sharing via NFS
    5. NFSv4
    6. NFS Clients
    7. NFS Server Configuration
    8. Implementing NFSv4
    9. AutoFS
    10. AutoFS Configuration
    11. Accessing Windows/Samba Shares from Linux
    12. SAN Multipathing
    13. Multipath Configuration
    14. Multipathing Best Practices
    Lab Tasks
    1. Using autofs
    2. NFS Server Configuration
  7. User/Group Administration
    1. User and Group Concepts
    2. User Administration
    3. Modifying Accounts
    4. Group Administration
    5. Password Aging
    6. Default User Files
    7. Controlling Logins
    8. Manual DS Client Configuration
    9. system-config-authentication
    10. System Security Services Daemon (SSSD)
    Lab Tasks
    1. User and Group Administration
    2. Using LDAP for Centralized User Accounts
    3. Troubleshooting Practice: Account Management
    4. Using NIS for Centralized User Accounts
  8. Pluggable Authentication Modules (PAM)
    1. PAM Overview
    2. PAM Module Types
    3. PAM Order of Processing
    4. PAM Control Statements
    5. PAM Modules
    6. pam_unix
    7. pam_nologin.so
    8. pam_limits.so
    9. pam_wheel.so
    10. pam_xauth.so
    Lab Tasks
    1. Restricting superuser access to wheel group membership
    2. Using pam_nologin to Restrict Logins
    3. Setting Limits with the pam_limits Modules
    4. Using pam_limits to Restrict Simultaneous Logins
  9. Security Administration
    1. Security Concepts
    2. Tightening Default Security
    3. Security Advisories
    4. File Access Control Lists
    5. Manipulating FACLs
    6. Viewing FACLs
    7. Backing Up FACLs
    8. File Creation Permissions with umask
    9. User Private Group Scheme
    10. Alternatives to UPG
    11. Basic Firewall Activation
    Lab Tasks
    1. User Private Groups
    2. Using Filesystem ACLs
  10. Basic Networking
    1. IPv4 Fundamentals
    2. TCP/UDP Fundamentals
    3. Linux Network Interfaces
    4. Ethernet Hardware Tools
    5. Network Configuration with ip Command
    6. Configuring Routing Tables
    7. IP to MAC Address Mapping with ARP
    8. Starting and Stopping Interfaces
    9. NetworkManager
    10. DNS Clients
    11. DHCP Clients
    12. system-config-network{tui,cmd}
    13. Network Diagnostics
    14. Information from netstat and ss
    15. Managing Network-Wide Time
    16. Continual Time Sync with NTP
    17. Configuring NTP Clients
    18. Useful NTP Commands
    Lab Tasks
    1. Network Discovery
    2. Basic Client Networking
    3. NTP Client Configuration
  11. Advanced Networking
    1. Multiple IP Addresses
    2. Configuring a DHCP server
    3. Enabling IPv6
    4. Interface Bonding
    5. Interface Bridging
    6. 802.1q VLANS
    7. Tuning Kernel Network Settings
    Lab Tasks
    1. Multiple IP Addresses Per Network Interface
    2. Configuring IPv6
    3. Troubleshooting Practice: Networking
  12. Log File Administration
    1. System Logging
    2. Rsyslog
    3. /etc/rsyslog.conf
    4. Log Management
    5. Log Anomaly Detector
    Lab Tasks
    1. Setting up a Full Debug Logfile
    2. Remote Syslog Configuration
  13. Monitoring & Troubleshooting
    1. System Status - Memory
    2. System Status - I/O
    3. System Status - CPU
    4. Performance Trending with sar
    5. Process Accounting
    6. Troubleshooting Basics: The Process
    7. Troubleshooting Basics: The Tools
    8. strace and ltrace
    9. Common Problems
    10. Troubleshooting Incorrect File Permissions
    11. Inability to Boot
    12. Typos in Configuration Files
    13. Corrupt Filesystems
    14. RHEL6 Rescue Environment
    Lab Tasks
    1. Recovering Damaged MBR
    2. Using BSD Process Accounting
  14. Apache
    1. HTTP Operation
    2. Apache Architecture
    3. Dynamic Shared Objects
    4. Adding Modules to Apache
    5. Apache Configuration Files
    6. httpd.conf  - Server Settings
    7. httpd.conf  - Main Configuration
    8. HTTP Virtual Servers
    9. Virtual Hosting DNS Implications
    10. httpd.conf  - VirtualHost Configuration
    11. Port and IP based Virtual Hosts
    12. Name-based Virtual Host
    13. Apache Logging
    14. Log Analysis
    Lab Tasks
    1. Apache Architecture
    2. Apache Content
    3. Configuring Virtual Hosts
  15. Apache Server-Side Scripting Administration
    1. Dynamic HTTP Content
    2. Java Servlets and JSP
    3. Apache's Tomcat
    4. Installing Java SDK
    5. Installing Tomcat Manually
    6. Using Tomcat with Apache
    Lab Tasks
    1. Apache's Tomcat
  1. Pre-Installation Considerations
    1. Pre-Installation Considerations
    2. Hardware Compatibility
    3. Multi-OS Booting
    4. Partition Considerations
    5. Filesystem Planning
    6. Selecting a Filesystem
  2. Installing RHEL6
    1. Anaconda: An Overview
    2. Anaconda: Booting the System
    3. Anaconda: Common Boot Options
    4. Anaconda: Loading Anaconda and Packages
    5. Anaconda: Storage Options
    6. Anaconda: Troubleshooting
    7. FirstBoot
    8. Kickstart
    9. A Typical Install
    Lab Tasks
    1. Linux Installation
    2. Automating Installation with Kickstart
  3. SELinux
    1. SELinux Security Framework
    2. SELinux Modes
    3. SELinux Commands
    4. Choosing an SELinux Policy
    5. SELinux Booleans
    6. Permissive Domains
    7. SELinux Policy Tools
    Lab Tasks
    1. Exploring SELinux Modes
    2. SELinux File Contexts