Practical Linux System Administration

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• Preface
  • Who Should Read This Book
  • Why I Wrote This Book
  • Navigating This Book
  • Conventions Used in This Book
  • Using Code Examples
  • OReilly Online Learning
  • How to Contact Us
  • Acknowledgments
• 1. Getting Started with Linux
  • Installing Linux
    • Preparing Your System for Linux
    • Downloading and Installing Linux
  • Getting to Know Your New Linux System
  • Learning the CLI
    • pwd
    • cd
    • ls
  • Starting, Rebooting, and Shutting Down a Linux System
    • Starting a System
    • Restarting a System
    • Shutting Down a System
  • Summary
• 2. Working with Permissions and Privileged Accounts
  • Working as a Regular User
  • Working as the Root User
    • Logging in as Root
    • Using the su Command
    • Using the sudo Command
    • Creating a Sudoer
  • Reading and Modifying Permissions
    • Read, Write, and Execute
    • Numerical Permission Values
    • Group Permissions
    • Bringing Permissions into Focus
  • Changing File Permissions
    • Symbolic Mode
    • Numeric Mode
    • Default Permissions Explained: umask
  • Summary
• 3. Customizing the User Experience
  • Altering Home Directory Options
    • Login Versus Nonlogin Shells
    • /etc/bashrc
    • /etc/profile
    • .bashrc
    • .bash_profile
    • .bash_logout
  • The /etc/skel Directory
  • Customizing the Shell Prompt
  • Summary
• 4. Managing Users
  • User and Group ID Numbering Conventions
  • Creating User Accounts
    • Adding Users with useradd
    • Adding Users with adduser
  • Modifying User Accounts
    • Adding a Supplementary Group
    • Changing the User Comments Field
    • Setting an Expiration (Expiry) Date on an Account
    • Changing a Users Login Shell
  • Removing User Accounts
  • Forcing Password Changes
  • Handling Service Accounts
  • Managing Groups Rather Than Users
  • Summary
• 5. Connecting to a Network
  • Plugging into a Network
    • Static IP Addressing
    • Dynamic IP Addressing
  • Networking and Security
    • Preparing a System for Network Connectivity
    • Pruning Your Systems
    • Securing Network Daemons
    • The Secure Shell Daemon
      • Limiting access to SSHD from specific hosts
      • Implementing firewalld rules
      • Denying SSH access for the root user
      • Using keys rather than passwords for authentication
      • Remote connectivity: client to server
  • Summary
• 6. Installing and Uninstalling Software
  • Updating Your System
    • Applying Red Hat Enterprise LinuxBased System Updates
    • Applying Debian-Based System Updates
  • Installing Software from Repositories
    • Installing an Application
    • Uninstalling an Application
  • Installing and Uninstalling Individual Software Packages
    • Installing an Individual Software Package Manually
    • Uninstalling Individual Software Packages
    • Finding Package Dependencies
  • Installing Software from Source Code
    • Satisfying Prerequisites: Building a Development Environment
    • Download, Extract, Compile, and Install Your Software
    • Uninstalling a Source-Installed Software Package
  • Summary
• 7. Managing Storage
  • Administering Linux Storage
    • Disks
    • Filesystems
    • Mounting and Mount Points
    • Physical and Logical Volumes
    • Checking Space
    • Swap Space
    • RAM-Based Temporary Space (ramfs and tmpfs)
  • Adding a New Disk to a System
    • Installing the Disk
    • Prepping the Disk for Use
    • Implementing Logical Volumes
      • Identifying available disks
      • Extending a logical volume
  • Decommissioning and Disk Disposal
    • Notification
    • Scream Test
    • Power Down
    • Disk Wiping
    • Unracking and Palletizing
    • Disposal
  • Summary
• 8. Maintaining System Health
  • Keeping Your System Clutter-Free
    • Cleaning the /tmp Directory
    • Making /home a Livable Space for Everyone
      • Create a new partition on the disk
      • Create the filesystem
      • Mount the new partition
      • Copy files from /home to /mnt
      • Remove all files from /home
      • Unmount /dev/sdc1 from /mnt
      • Mount the new partition on /home
      • Create the /etc/fstab entry
  • Decluttering Shared Directories
    • Deduplicating Files with fdupes
    • Tackling /home File Sprawl with Quotas
  • Patching Your Way to a Healthy System
    • Patching a Red Hat Enterprise LinuxBased System
    • Patching a Debian-Based Linux System
  • Securing Your Systems
  • Maintaining User and Group Accounts
    • Setting Up a Naming Convention
    • Creating Account Retention Policies
      • Changing inactive account status
      • Protecting user accounts
    • Retiring Group Accounts
  • Monitoring System Health
    • Gathering System Activity Reports
    • Formatting System Activity Reports
  • Summary
• 9. Monitoring Your System
  • Maintaining Vigilance on CPU, Memory, and Disk Performance and Capacity
    • Tracking CPU Usage
      • The top commands
        • top
        • atop
        • htop
      • ps
      • glances
    • Exploring sysstat Monitoring
      • Reporting System Activity
      • Displaying System Activity Data in Multiple Formats
      • Monitoring System I/O Device Loading with iostat
      • Kicking It Old-School with the tapestat Utility
      • Collecting Processor Statistics
      • Monitoring Linux Tasks with pidstat
      • Watching Windows-Compatible Filesystem Statistics with cifsiostat
  • Summary
• 10. Scripting and Automation
  • Answering the Question: Why Automate?
  • Automating Yourself Out of a Job
  • Creating Scripts
    • Outlining Your Scripts
    • Writing a Script from an Outline
  • Scheduling Tasks
    • Using cron to Schedule Tasks
    • Preventing Time Drift with the Network Time Protocol
  • Summary
• 11. Deploying Samba for Windows Compatibility
  • Planning Your Samba Environment
    • Installing Samba and Its Dependencies
    • Adding Samba Users to Your System
    • Managing Samba Users as a Group
  • Providing Services to Mac and Windows Clients
    • Serving Network Storage to Desktop Clients
      • Exploring global Samba settings
      • Printing via Samba
      • Deploying the lmhosts file
    • Configuring a Shared Directory
    • Browsing for Shared Directories
    • Mounting Windows Systems Shares
  • Summary
• 12. Troubleshooting Linux
  • Reviving the Operating System
    • De-escalating a Kernel Panic
    • Scraping System Logs
  • Unraveling Software Problems
    • Inspecting System Logs
    • Checking Application Logs
    • Leveraging Internal Application Checks
    • Managing Firewalls and Their Rules
    • Removing and Reinstalling Software
    • Rebooting Your System
  • Dealing with Hardware Failures
    • Preemptively Troubleshooting Hardware
    • Gathering System Hardware Information
      • hwinfo
      • lshw
      • lspci
      • lsblk
      • lscpu
  • Creating Automated Security Checks
  • Summary
• 13. Securing Your System
  • Protecting the Root Account
  • Finding the Balance Between Security and Usability
    • Minimizing Your Systems Attack Surface
      • Checking for and removing a GUI
      • Creating single-purpose systems
    • Creating and Securing User Accounts
      • Creating and enforcing a strong password policy
      • Connecting to other systems via passwordless key files
        • Creating the key file
        • Adding extra security to SSHD
  • Implementing Advanced Security Measures
    • Applying STIG Security Controls
    • Installing and Using Security Tools
      • Lynis
      • Portsentry
      • Advanced Intrusion and Detection Environment
  • Responding to Security Incidents
    • Creating a Written Security Policy
    • Confirming the Breach
    • Identifying the Malicious Actor(s)
    • Taking Corrective Actions
  • Summary
• 14. Continuing Your Education
  • Training Internally
  • Seeking Certification
    • Preparing for a Certification Exam
    • Taking the Exam
  • Educating Yourself
  • Formalizing Your Education
  • Using Your Job as Education
  • Summary
• 15. Making Career Moves
  • Starting Your Own Business
    • Facing Self-Employment Realities
    • Managing Employees
    • Hiring Contractors
  • Moving into Corporate Management
    • Challenging Yourself
    • Managing Your New Role
  • Changing with the Job Market
    • Searching Online Job Boards
      • Professional networking via LinkedIn
      • Finding a better way to work with FlexJobs
      • Finding the right fit with Monster
      • Searching for jobs at Indeed
    • Working Remotely
      • Maintaining focus throughout your workday
    • Learning How to Communicate
      • Working via video conference and instant messaging
        • Video conference calling
        • Instant messaging
      • Communicating via email
  • Leaving Your Current Position
    • Writing the Resignation Letter
      • Giving notice of your intent to leave
      • Describing your goals
      • Offering to help during the transition
      • Leaving your options open
      • Delivering the letter
    • Leaving Your Job
      • Transitioning your duties
      • Completing unfinished tasks
      • Writing documentation
      • Handling your exit interview
  • Summary
• Index

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