Lantec | Course: GL250 - Enterprise Linux System Administration

GL250 - Enterprise Linux System Administration

5 days


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. Like all Guru Labs courses, 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.



  • Hardware Discovery Tools
  • Configuring New Hardware with hwinfo
  • Kernel Hardware Info /sys/
  • /sys/ Structure
  • udev
  • Managing Linux Device Files
  • List Block Devices
  • SCSI Devices
  • USB Devices
  • USB Architecture
  • Kernel Modules
  • Configuring Kernel Components and Modules
  • Handling Module Dependencies
  • Configuring the Kernel via /proc/
  • Console
  • Virtual Terminals
  • Keyboard & locale configuration
  • Serial Ports
  • Random Numbers and /dev/random
Lab Tasks
  • Adjusting Kernel Options
  • Linux Kernel Driver Compilation
  • Introduction to Troubleshooting Labs
  • Troubleshooting Practice: Kernel Modules


  • System Boot Method Overview
  • systemd System and Service Manager
  • systemd Targets
  • Using systemd
  • Linux Runlevels Aliases
  • Legacy Support for SysV init
Lab Tasks
  • Managing Services With Systemd's systemctl
  • Creating a systemd unit file


  • Booting Linux on PCs
  • GRUB 2
  • GRUB 2 Configuration
  • GRUB 2 Security
  • Boot Parameters
  • Initial RAM Filesystem
  • init
  • Systemd and
  • Systemd and
  • Legacy local bootup script support
  • System Configuration Files
  • RHEL7 Configuration Utilities
  • SLES12 Configuration Utilities
  • Shutdown and Reboot
Lab Tasks
  • Boot Process
  • Booting directly to a bash shell
  • GRUB Command Line
  • Basic GRUB Security
  • Troubleshooting Practice: Boot Process


  • 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
Lab Tasks
  • Managing Software with RPM
  • Creating a Custom RPM Repository
  • Querying the RPM Database
  • Installing Software via RPM & Source and Rebuilding SRPMs
  • Troubleshooting Practice: Package Management


  • Partitioning Disks with fdisk & gdisk
  • Resizing a GPT Partition with gdisk
  • 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
Lab Tasks
  • Creating and Managing Filesystems
  • Hot Adding Swap
  • Setting User Quotas


  • Logical Volume Management
  • Implementing LVM
  • Creating Logical Volumes
  • Activating LVM VGs
  • Exporting and Importing a VG
  • Examining LVM Components
  • Changing LVM Components
  • Advanced LVM Overview
  • Advanced LVM: Components & Object Tags
  • Advanced LVM: Automated Storage Tiering
  • Advanced LVM: Thin Provisioning
  • Advanced LVM: Striping & Mirroring
  • Advanced LVM: RAID Volumes
  • gnome-disk-utility
  • SLES Graphical Disk Tool
  • RAID Concepts
  • Array Creation with mdadm
  • Software RAID Monitoring
  • Software RAID Control and Display
Lab Tasks
  • Creating and Managing LVM Volumes
  • Troubleshooting Practice: LVM
  • Creating and Managing a RAID-5 Array


  • Remote Storage Overview
  • Remote Filesystem Protocols
  • Remote Block Device Protocols
  • File Sharing via NFS
  • NFSv4+
  • NFS Clients
  • NFS Server Configuration
  • YaST NFS Server Administration
  • 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
Lab Tasks
  • Using autofs
  • NFS Server Configuration
  • iSCSI Initiator Configuration
  • Multipathing with iSCSI


  • Approaches to Storing User Accounts
  • User and Group Concepts
  • User Administration
  • Modifying Accounts
  • Group Administration
  • Password Aging
  • Default User Files
  • Controlling Login Sessions
  • RHEL DS Client Configuration
  • SLES DS Client Configuration
  • System Security Services Daemon (SSSD)
Lab Tasks
  • User and Group Administration
  • Using LDAP for Centralized User Accounts
  • Troubleshooting Practice: Account Management


  • PAM Overview
  • PAM Module Types
  • PAM Order of Processing
  • PAM Control Statements
  • PAM Modules
  • pam_unix
Lab Tasks
  • Restricting superuser access to wheel group membership
  • Using pam_nologin to Restrict Logins
  • Setting Limits with the pam_limits Modules
  • Using pam_limits to Restrict Simultaneous Logins


  • Security Concepts
  • Tightening Default Security
  • SuSE Security Checker
  • Security Advisories
  • Fine Grained Authorizations with Polkit
  • File Access Control Lists
  • Manipulating FACLs
  • Viewing FACLs
  • Backing Up FACLs
  • File Creation Permissions with umask
  • User Private Group Scheme
  • Alternatives to UPG
  • AppArmor
  • SELinux Security Framework
  • SELinux Modes
  • SELinux Commands
  • Choosing an SELinux Policy
  • SELinux Booleans
  • Permissive Domains
  • SELinux Policy Tools
  • SUSE Basic Firewall Configuration
  • FirewallD
Lab Tasks
  • User Private Groups
  • Using Filesystem ACLs
  • Exploring AppArmor
  • Exploring SELinux Modes
  • SELinux File Contexts


  • 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
  • SUSE YaST Network Configuration Tool
  • 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
Lab Tasks
  • Network Discovery
  • Basic Client Networking
  • NTP Client Configuration


  • Multiple IP Addresses
  • Configuring a DHCP server
  • IPv6
  • Interface Aggregation
  • Interface Bonding
  • Network Teaming
  • Interface Bridging
  • Tuning Kernel Network Settings
Lab Tasks
  • Multiple IP Addresses Per Network Interface
  • Configuring IPv6
  • Troubleshooting Practice: Networking


  • System Logging
  • systemd Journal
  • systemd Journal's journactl
  • Secure Logging with Journal's Log Sealing
  • gnome-system-log
  • Rsyslog
  • /etc/rsyslog.conf
  • Log Management
  • Log Anomaly Detector
  • Sending logs from the shell
Lab Tasks
  • Using the systemd Journal
  • Setting up a Full Debug Logfile
  • Remote Syslog Configuration
  • Remote Rsyslog TLS Configuration


  • System Status Memory
  • System Status I/O
  • System Status 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
  • SUSE Rescue Environment
Lab Tasks
  • System Activity Reporter
  • Cgroup for Processes
  • Recovering Damaged MBR

Scheduled Courses

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Jennifer Carnevale, Cox Communications

"I came into the class expecting Excel to be very intimidating, but I actually learned a lot and look forward to the advanced class."