CompTIA Linux+ XK0-005 Cert Guide

Ross Brunson has more than 30 years of experience as a Linux and open-source trainer, training manager, and certification architect, and is the author of the nowclassic LPIC-1 Exam Cram 2, several iterations of the CompTIA Linux+ Cert Guide, and dozens of technical courses for major organizations.  Ross is currently the Education Architect at Grafana Labs (www.grafana.com), where he focuses on building a learning framework and training offerings that help employees and customers make the best use of Grafana to observe, troubleshoot, and maintain their environments.  Previously, Ross was a Senior Technical Training Engineer for NGINX, where he completely redid the Fundamentals learning track, authored a number of Getting Started guides, and taught a number of customer engagements to help new NGINX customers take full advantage of the platform.  Before NGINX, Ross enjoyed a few years at Linux Academy/A Cloud Guru where as a Senior Training Architect, he authored the SUSE Certified Administrator and Engineer courses, did the Red Hat Certified System Administrator Labs, created many additional courses on systemd, VIM and the screen command, and wrote and reviewed way too many exam questions.  Ross has also put in a tour of duty as the Certification Architect at SUSE, where he helped redesign and modernize the entire certification program. He has also spent five years as the Director of Member Services for the Linux Professional Institute, where he contributed to placing several LPI courses into the Cisco Networking Academy, conducted dozens of train-the-trainer sessions, and provided sales enablement support for the worldwide Master Affiliate network, spanning more than 100 countries and nearly a million certified professionals.  Ross holds a number of key IT certifications and is author of several successful technical books and dozens of technical courses for major organizations (including the first U.S. LPI Certification Bootcamps). He is skilled at both contributing to and building community around IT products.  Ross lives in Paradise Valley, Montana, with his family and enjoys traveling far and wide, participating in hiking, winter sports, photography, and playing the drums with great vigor (although not everyone around him appreciates it).

• Introduction xliiiPart I: System Management (Obj. 1.1 - 1.7)Chapter 1 Understanding Linux Fundamentals 3“Do I Know This Already?” Quiz 3Foundation Topics 6Filesystem Hierarchy Standard 6Basic Boot Process 8Boot Loaders and Files 14When Kernels Panic 22Device Types in /dev 23Installing Software from Source 24Storage Concepts 28Listing Your Hardware Info 35Summary 38Exam Preparation Tasks 39Review All Key Topics 39Define Key Terms 40Review Questions 40Chapter 2 Managing Files and Directories 43“Do I Know This Already?” Quiz 43Foundation Topics 46File and Directory Operations 46File Metadata and File Types 57Soft and Hard Links 60File Compression, Archiving, and Backup 63Copying Objects Between Systems 78File Editing 82Feeling a Bit (awk)ward 92The printf Function 94Summary 95Exam Preparation Tasks 96Review All Key Topics 96Define Key Terms 97Review Questions 97Chapter 3 Configuring and Managing Storage 101“Do I Know This Already?” Quiz 101Foundation Topics 104Determining Storage Hardware 104Performing Disk Partitioning 108Inspecting and Managing Software RAID 114Using Logical Volume Manager (LVM) 114Mounting Local and Remote Devices 118Monitoring Storage Space and Disk Usage 123Filesystem Management 126Storage Area Networks/Network-Attached Storage 131Summary 134Exam Preparation Tasks 135Review All Key Topics 135Define Key Terms 136Review Questions 136Chapter 4 Managing Processes and Services 139“Do I Know This Already?” Quiz 139Foundation Topics 142Managing Processes 142systemd 159Scheduling Services 170Summary 180Exam Preparation Tasks 181Review All Key Topics 181Define Key Terms 182Review Questions 182Chapter 5 Using Network Tools and Configuration Files 185“Do I Know This Already?” Quiz 186Foundation Topics 188Interface Management 188Name Resolution 199Network Monitoring 207Remote Networking Tools 217Summary 221Exam Preparation Tasks 222Review All Key Topics 222Define Key Terms 223Review Questions 223Chapter 6 Building and Installing Software 225“Do I Know This Already?” Quiz 226Foundation Topics 228Package Management 228Sandboxed Applications 268System Updates 270Summary 275Exam Preparation Tasks 276Review All Key Topics 276Define Key Terms 277Chapter 7 Managing Software Configurations 281“Do I Know This Already?” Quiz 281Foundation Topics 283Updating Configuration Files 283Configuring Kernel Options 289Configuring Common System Services 300Representing Locales 304Summary 315Exam Preparation Tasks 316Review All Key Topics 316Define Key Terms 317Review Questions 317Part II: Security (Obj. 2.1 - 2.5)Chapter 8 Understanding Linux Security Best Practices 321“Do I Know This Already?” Quiz 321Foundation Topics 323Public Key Infrastructure 323Certificate Use Cases 325Authentication 326Linux Hardening 333Summary 348Exam Preparation Tasks 349Review All Key Topics 349Define Key Terms 350Review Questions 350Chapter 9 Implementing Identity Management 353“Do I Know This Already?” Quiz 353Foundation Topics 355Account Creation and Deletion 355Summary 374Exam Preparation Tasks 375Review All Key Topics 375Define Key Terms 375Review Questions 376Chapter 10 Implementing and Configuring Firewalls 379“Do I Know This Already?” Quiz 379Foundation Topics 382Common Firewall Technologies 382Understanding iptables 385Additional Firewall Technologies 398Summary 400Exam Preparation Tasks 401Review All Key Topics 401Define Key Terms 401Review Questions 402Chapter 11 Using Remote Connectivity for System Management 405“Do I Know This Already?” Quiz 405Foundation Topics 408SSH (Secure Shell) 408Executing Commands as Another User 416Summary 421Exam Preparation Tasks 422Review All Key Topics 422Define Key Terms 423Review Questions 423Chapter 12 Understanding and Applying Access Controls 427“Do I Know This Already?” Quiz 427Foundation Topics 429File Permissions 429File and Directory Ownership 434Understanding and Using umask 437Permission Granularity Issues 437Finding Files by Permission 444Access Control Lists 445Context-Based Access 448Command-Line Utilities 457Summary 457Exam Preparation Tasks 458Review All Key Topics 458Define Key Terms 458Review Questions 459Part III: Scripting, Containers and Automation (Obj. 3.1 - 3.5)Chapter 13 Automating Tasks via Shell Scripting 463“Do I Know This Already?” Quiz 463Foundation Topics 466Shell Script Elements 466Environment Variables and Settings 469Working with Input/Output Streams 475Shell Script Elements 487Summary 517Exam Preparation Tasks 518Review All Key Topics 518Define Key Terms 519Review Questions 519Chapter 14 Performing Basic Container Operations 523“Do I Know This Already?” Quiz 523Foundation Topics 525Container Management 525Container Image Operations 533Summary 534Exam Preparation Tasks 535Review All Key Topics 535Define Key Terms 535Review Questions 536Chapter 15 Performing Basic Version Control Using Git 539“Do I Know This Already?” Quiz 539Foundation Topics 541Version Control Concepts 541Using Git for Version Control 546Summary 568Exam Preparation Tasks 569Review All Key Topics 569Define Key Terms 569Review Questions 570Chapter 16 Understanding Infrastructure as Code 573“Do I Know This Already?” Quiz 573Foundation Topics 576File Formats 576Infrastructure as Code Concepts 579Continuous Integration/Continuous Deployment 588Advanced Git Topics 590Summary 591Exam Preparation Tasks 592Review All Key Topics 592Define Key Terms 593Review Questions 593Chapter 17 Understanding Containers, Cloud, and Orchestration 597“Do I Know This Already?” Quiz 597Foundation Topics 600Kubernetes Benefits and Application Use Cases 600Single-Node Multicontainer Use Cases 604Container Persistent Storage 605Container Networks 608Service Mesh 611Bootstrapping 612Container Registries 613Summary 614Exam Preparation Tasks 615Review All Key Topics 615Define Key Terms 616Review Questions 616Part IV: Troubleshooting (Obj. 4.1 - 4.5)Chapter 18 Analyzing and Troubleshooting Storage Issues 619“Do I Know This Already?” Quiz 619Foundation Topics 623High Latency Issues 623Low Throughput Issues 627Input/Output Operations per Second Scenarios 631Capacity Issues 633Filesystem Issues 638I/O Scheduler Issues 643Device Issues 647LVM Issues 656Mount Option Issues 659Exam Preparation Tasks 663Review All Key Topics 663Define Key Terms 664Review Questions 664Chapter 19 Analyzing and Troubleshooting Network Resource Issues 667“Do I Know This Already?” Quiz 667Foundation Topics 670Network Configuration Issues 670Firewall Issues 674Interface Errors 679Bandwidth Limitations 686Name Resolution Issues 687Testing Remote Systems 689Summary 696Exam Preparation Tasks 697Review All Key Topics 697Define Key Terms 698Review Questions 698Chapter 20 Analyzing and Troubleshooting CPU and Memory Issues 701“Do I Know This Already?” Quiz 701Foundation Topics 704Runaway and Zombie Processes 704High CPU Utilization/Load Average/Run Queues 707CPU Times and CPU Process Priorities 711Memory Exhaustion and Out of Memory 713Swapping 717Hardware 719Summary 720Exam Preparation Tasks 721Review All Key Topics 721Define Key Terms 721Review Questions 721Chapter 21 Analyzing and Troubleshooting User and File Permissions 725“Do I Know This Already?” Quiz 725Foundation Topics 728User Login Issues 728User File Access Issues 731Password Issues 735Privilege Elevation Issues 736Quota Issues 736Summary 738Exam Preparation Tasks 739Review All Key Topics 739Define Key Terms 739Review Questions 739Chapter 22 Analyzing and Troubleshooting Common Problems Using Systemd 743“Do I Know This Already?” Quiz 743Foundation Topics 745Unit Files 745Common Problems 756Summary 761Exam Preparation Tasks 762Review All Key Topics 762Define Key Terms 762Review Questions 763Chapter 23 Final Preparation 765Exam Information 765Getting Ready 767Tools for Final Preparation 768Suggested Plan for Final Review/Study 772Summary 772Appendix A Answers to the “Do I Know This Already?” Quizzes and Review Questions 773Glossary 790  Online Elements:Appendix B Study Planner9780137866885, TOC, 10/3/23