Practical Linux System Administration - Helion

ebook

Autor: Kenneth Hess
ISBN: 9781098108984
stron: 248, Format: ebook
Data wydania: 2023-04-18
Księgarnia: Helion

Cena książki: 262,65 zł (poprzednio: 309,00 zł)
Oszczędzasz: 15% (-46,35 zł)

Osoby, które kupiły tę książkę, wybierały także »

This essential guide covers all aspects of Linux system administration, from user maintenance, backups, filesystem housekeeping, storage management, and network setup to hardware and software troubleshooting and some application management. It's both a practical daily reference manual for sysadmins and IT pros and a handy study guide for those taking Linux certification exams.

You'll turn to it frequently, not only because of the sheer volume of valuable information it provides but because of the real-world examples within and the clear, useful way the information is presented. With this book at your side, you'll be able to:

Install Linux and perform initial setup duties, such as connecting to a network
Navigate the Linux filesystem via the command line
Install software from repositories and source and satisfy dependencies
Set permissions on files and directories
Create, modify, and remove user accounts
Set up networking
Format and mount filesystems
Perform basic troubleshooting on hardware and software
Create and manage logical volumes
Work with SELinux
Manage a firewall and iptables
Shut down, reboot, and recover a system
Perform backups and restores

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Spis treści

Practical Linux System Administration eBook -- spis treści

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