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Red Hat RHCSA 8 Cert Guide: EX200, 2nd Edition

by Sander van Vugt

March 2021

Intermediate to advanced

704 pages

18h 20m

English

Pearson IT Certification

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Goals and MethodsWho Should Read This Book?How This Book Is OrganizedHow to Use This BookOther FeaturesExam Objective to Chapter MappingWhere Are the Companion Content Files?
“Do I Know This Already?” QuizFoundation TopicsPreparing to Install Red Hat Enterprise LinuxPerforming a Manual InstallationSummaryExam Preparation TasksReview All Key TopicsDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 1.1
“Do I Know This Already?” QuizFoundation TopicsBasic Shell SkillsEditing Files with vimUnderstanding the Shell EnvironmentFinding HelpSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 2.1
“Do I Know This Already?” QuizFoundation TopicsWorking with the File System HierarchyManaging FilesUsing LinksWorking with Archives and Compressed FilesSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 3.1
“Do I Know This Already?” QuizFoundation TopicsUsing Common Text File–Related ToolsA Primer to Using Regular ExpressionsUsing grep to Analyze TextWorking with Other Useful Text Processing UtilitiesSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 4.1
“Do I Know This Already?” QuizFoundation TopicsWorking on Local ConsolesUsing SSH and Related UtilitiesSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabsLab 5.1Lab 5.2
“Do I Know This Already?” QuizFoundation TopicsUnderstanding Different User TypesManaging User AccountsCreating and Managing Group AccountsSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 6.1
“Do I Know This Already?” QuizFoundation TopicsManaging File OwnershipManaging Basic PermissionsManaging Advanced PermissionsManaging ACLsSetting Default Permissions with umaskWorking with User-Extended AttributesSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 7.1
“Do I Know This Already?” QuizFoundation TopicsNetworking FundamentalsManaging Network Addresses and InterfacesValidating Network ConfigurationConfiguring Network Configuration with nmtui and nmcliSetting Up Hostname and Name ResolutionSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 8.1
“Do I Know This Already?” QuizFoundation TopicsManaging Software Packages with yumUsing yumManaging Package Module StreamsManaging Software Packages with rpmSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabsLab 9.1Lab 9.2
“Do I Know This Already?” QuizFoundation TopicsIntroducing Process ManagementManaging Shell JobsUsing Common Command-Line Tools for Process ManagementUsing top to Manage ProcessesUsing tuned to Optimize PerformanceSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 10.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding SystemdManaging Units Through SystemdSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 11.1
“Do I Know This Already?” QuizFoundation TopicsConfiguring cron to Automate Recurring TasksConfiguring at to Schedule Future TasksSummaryExam Preparation TasksReview All Key TopicsDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 12.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding System LoggingConfiguring rsyslogdRotating Log FilesWorking with journaldSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 13.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding MBR and GPT PartitionsManaging Partitions and File SystemsMounting File SystemsSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 14.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding LVMCreating LVM Logical VolumesResizing LVM Logical VolumesConfiguring StratisConfiguring VDOSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabsLab 15.1Lab 15.2Lab 15.3
“Do I Know This Already?” QuizFoundation TopicsUnderstanding the Role of the Linux KernelWorking with Kernel ModulesUpgrading the Linux KernelSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 16.1
“Do I Know This Already?” QuizFoundation TopicsManaging Systemd TargetsWorking with GRUB 2SummaryExam Preparation TasksReview All Key TopicsDefine Key TermsReview QuestionsEnd-of-Chapter LabsLab 17.1Lab 17.2
“Do I Know This Already?” QuizFoundation TopicsUnderstanding the RHEL 8 Boot ProcedurePassing Kernel Boot ArgumentsUsing a Rescue DiskFixing Common IssuesRecovering Access to a Virtual MachineSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 18.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding Shell Scripting Core ElementsUsing Variables and InputUsing Conditional LoopsSummaryExam Preparation TasksReview All Key TopicsDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 19.1
“Do I Know This Already?” QuizFoundation TopicsHardening the SSH ServerUsing Other Useful sshd OptionsConfiguring Key-Based Authentication with PassphrasesSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 20.1
“Do I Know This Already?” QuizFoundation TopicsConfiguring a Basic Apache ServerUnderstanding Apache Configuration FilesCreating Apache Virtual HostsSummaryExam Preparation TasksReview All Key TopicsDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 21.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding SELinux Working and ModesUnderstanding Context Settings and the PolicyRestoring Default File ContextsUsing Boolean Settings to Modify SELinux SettingsDiagnosing and Addressing SELinux Policy ViolationsSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 22.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding Linux FirewallingWorking with FirewalldSummaryExam Preparation TasksReview All Key TopicsDefine Key TermsComplete Tables and Lists from MemoryReview QuestionsEnd-of-Chapter LabLab 23.1
“Do I Know This Already?” QuizFoundation TopicsUsing NFS ServicesUsing CIFS ServicesMounting Remote File Systems Through fstabUsing Automount to Mount Remote File SystemsSummaryExam Preparation TasksReview All Key TopicsDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 24.1
“Do I Know This Already?” QuizFoundation TopicsUnderstanding Local TimeUsing Network Time ProtocolManaging Time on Red Hat Enterprise LinuxSummaryExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 25.1
Do I Know This Already QuizFoundation TopicsUnderstanding ContainersRunning a ContainerWorking with Container ImagesManaging ContainersManaging Container StorageRunning Containers as Systemd ServicesExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsReview QuestionsEnd-of-Chapter LabLab 26.1
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Content preview from Red Hat RHCSA 8 Cert Guide: EX200, 2nd Edition

Chapter 23

Configuring a Firewall

The following topics are covered in this chapter:

The following RHCSA exam objective is covered in this chapter:

Restrict network access using firewall-cmd/firewall

If a server is connected to the Internet, it needs to be protected against unauthorized access. SELinux is one part of this protection as discussed in Chapter 22, “Managing SELinux,” and a firewall is the second part. The Linux kernel implements firewalling via the netfilter framework. To configure which packets are allowed and which are not, Firewalld is the default solution in RHEL 8. In this chapter, you learn how a basic Firewalld configuration is created in an RHEL 8 environment.