System Administrator's Guide Red Hat Enterprise Linux 7 Administrators En US

Red_Hat_Enterprise_Linux-7-System_Administrators_Guide-en-US

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Table of Contents
PART I. BASIC SYSTEM CONFIGURATION
CHAPTER 1. GETTING STARTED
- WHAT IS COCKPIT AND WHICH TASKS IT CAN BE USED FOR
- 1.1. BASIC CONFIGURATION OF THE ENVIRONMENT
- 1.2. CONFIGURING AND INSPECTING NETWORK ACCESS
- 1.3. THE BASICS OF REGISTERING THE SYSTEM AND MANAGING SUBSCRIPTIONS
- 1.4. INSTALLING SOFTWARE
- 1.5. MAKING SYSTEMD SERVICES START AT BOOT TIME
- 1.6. ENHANCING SYSTEM SECURITY WITH A FIREWALL, SELINUX AND SSH LOGINGS
- 1.7. THE BASICS OF MANAGING USER ACCOUNTS
- 1.8. DUMPING THE CRASHED KERNEL USING THE KDUMP MECHANISM
- 1.9. PERFORMING SYSTEM RESCUE AND CREATING SYSTEM BACKUP WITH REAR
- 1.10. USING THE LOG FILES TO TROUBLESHOOT PROBLEMS
  - 1.10.1. Services Handling the syslog Messages
  - 1.10.2. Subdirectories Storing the syslog Messages
- 1.11. ACCESSING RED HAT SUPPORT
  - 1.11.1. Obtaining Red Hat Support Through Red Hat Customer Portal
    - 1.11.1.1. What is the Red Hat Support Tool and Which Tasks It Can Be Used For
  - 1.11.2. Using the SOS Report to Troubleshoot Problems
CHAPTER 2. SYSTEM LOCALE AND KEYBOARD CONFIGURATION
- 2.1. SETTING THE SYSTEM LOCALE
- 2.2. CHANGING THE KEYBOARD LAYOUT
- 2.3. ADDITIONAL RESOURCES
  - Installed Documentation
  - See Also
CHAPTER 3. CONFIGURING THE DATE AND TIME
- 3.1. USING THE TIMEDATECTL COMMAND
- 3.2. USING THE DATE COMMAND
- 3.3. USING THE HWCLOCK COMMAND
- 3.4. ADDITIONAL RESOURCES
  - Installed Documentation
  - See Also
CHAPTER 4. MANAGING USERS AND GROUPS
- 4.1. INTRODUCTION TO USERS AND GROUPS
- 4.2. MANAGING USERS IN A GRAPHICAL ENVIRONMENT
  - 4.2.1. Using the Users Settings Tool
- 4.3. USING COMMAND-LINE TOOLS
- 4.4. ADDITIONAL RESOURCES
CHAPTER 5. ACCESS CONTROL LISTS
- 5.1. MOUNTING FILE SYSTEMS
  - 5.1.1. NFS
- 5.2. SETTING ACCESS ACLS
- 5.3. SETTING DEFAULT ACLS
- 5.4. RETRIEVING ACLS
- 5.5. ARCHIVING FILE SYSTEMS WITH ACLS
- 5.6. COMPATIBILITY WITH OLDER SYSTEMS
- 5.7. ACL REFERENCES
CHAPTER 6. GAINING PRIVILEGES
- 6.1. CONFIGURING ADMINISTRATIVE ACCESS USING THE SU UTILITY
- 6.2. CONFIGURING ADMINISTRATIVE ACCESS USING THE SUDO UTILITY
- 6.3. ADDITIONAL RESOURCES
PART II. SUBSCRIPTION AND SUPPORT
CHAPTER 7. REGISTERING THE SYSTEM AND MANAGING SUBSCRIPTIONS
- 7.1. REGISTERING THE SYSTEM AND ATTACHING SUBSCRIPTIONS
- 7.2. MANAGING SOFTWARE REPOSITORIES
- 7.3. REMOVING SUBSCRIPTIONS
- 7.4. ADDITIONAL RESOURCES
CHAPTER 8. ACCESSING SUPPORT USING THE RED HAT SUPPORT TOOL
- 8.1. INSTALLING THE RED HAT SUPPORT TOOL
- 8.2. REGISTERING THE RED HAT SUPPORT TOOL USING THE COMMAND LINE
- 8.3. USING THE RED HAT SUPPORT TOOL IN INTERACTIVE SHELL MODE
- 8.4. CONFIGURING THE RED HAT SUPPORT TOOL
  - 8.4.1. Saving Settings to the Configuration Files
- 8.5. OPENING AND UPDATING SUPPORT CASES USING INTERACTIVE MODE
- 8.6. VIEWING SUPPORT CASES ON THE COMMAND LINE
- 8.7. ADDITIONAL RESOURCES
PART III. INSTALLING AND MANAGING SOFTWARE
CHAPTER 9. YUM
- 9.1. CHECKING FOR AND UPDATING PACKAGES
- 9.2. WORKING WITH PACKAGES
- 9.3. WORKING WITH PACKAGE GROUPS
- 9.4. WORKING WITH TRANSACTION HISTORY
- 9.5. CONFIGURING YUM AND YUM REPOSITORIES
- 9.6. YUM PLUG-INS
- 9.7. ADDITIONAL RESOURCES
PART IV. INFRASTRUCTURE SERVICES
CHAPTER 10. MANAGING SERVICES WITH SYSTEMD
- 10.1. INTRODUCTION TO SYSTEMD
- 10.2. MANAGING SYSTEM SERVICES
- 10.3. WORKING WITH SYSTEMD TARGETS
- 10.4. SHUTTING DOWN, SUSPENDING, AND HIBERNATING THE SYSTEM
- 10.5. CONTROLLING SYSTEMD ON A REMOTE MACHINE
- 10.6. CREATING AND MODIFYING SYSTEMD UNIT FILES
- 10.7. ADDITIONAL RESOURCES
CHAPTER 11. CONFIGURING A SYSTEM FOR ACCESSIBILITY
- 11.1. CONFIGURING THE BRLTTY SERVICE
- 11.2. SWITCH ON ALWAYS SHOW UNIVERSAL ACCESS MENU
- 11.3. ENABLING THE FESTIVAL SPEECH SYNTHESIS SYSTEM
  - Choose a Voice for Festival
CHAPTER 12. OPENSSH
- 12.1. THE SSH PROTOCOL
- 12.2. CONFIGURING OPENSSH
- 12.3. OPENSSH CLIENTS
- 12.4. MORE THAN A SECURE SHELL
  - 12.4.1. X11 Forwarding
  - 12.4.2. Port Forwarding
- 12.5. ADDITIONAL RESOURCES
CHAPTER 13. TIGERVNC
- 13.1. VNC SERVER
- 13.2. SHARING AN EXISTING DESKTOP
- 13.3. VNC VIEWER
- 13.4. ADDITIONAL RESOURCES
  - Installed Documentation
PART V. SERVERS
CHAPTER 14. WEB SERVERS
- 14.1. THE APACHE HTTP SERVER
CHAPTER 15. MAIL SERVERS
- 15.1. EMAIL PROTOCOLS
  - 15.1.1. Mail Transport Protocols
    - 15.1.1.1. SMTP
  - 15.1.2. Mail Access Protocols
- 15.2. EMAIL PROGRAM CLASSIFICATIONS
- 15.3. MAIL TRANSPORT AGENTS
- 15.4. MAIL DELIVERY AGENTS
  - 15.4.1. Procmail Configuration
  - 15.4.2. Procmail Recipes
- 15.5. MAIL USER AGENTS
  - 15.5.1. Securing Communication
    - 15.5.1.1. Secure Email Clients
    - 15.5.1.2. Securing Email Client Communications
- 15.6. CONFIGURING MAIL SERVER WITH ANTISPAM AND ANTIVIRUS
- 15.7. ADDITIONAL RESOURCES
CHAPTER 16. FILE AND PRINT SERVERS
- 16.1. SAMBA
- 16.2. FTP
- 16.3. PRINT SETTINGS
CHAPTER 17. CONFIGURING NTP USING THE CHRONY SUITE
- 17.1. INTRODUCTION TO THE CHRONY SUITE
  - 17.1.1. Differences Between ntpd and chronyd
  - 17.1.2. Choosing Between NTP Daemons
- 17.2. UNDERSTANDING CHRONY AND ITS CONFIGURATION
- 17.3. USING CHRONY
- 17.4. SETTING UP CHRONY FOR DIFFERENT ENVIRONMENTS
  - 17.4.1. Setting Up chrony for a System in an Isolated Network
- 17.5. USING CHRONYC
  - 17.5.1. Using chronyc to Control chronyd
- 17.6. CHRONY WITH HW TIMESTAMPING
- 17.7. ADDITIONAL RESOURCES
  - 17.7.1. Installed Documentation
  - 17.7.2. Online Documentation
CHAPTER 18. CONFIGURING NTP USING NTPD
- 18.1. INTRODUCTION TO NTP
- 18.2. NTP STRATA
- 18.3. UNDERSTANDING NTP
- 18.4. UNDERSTANDING THE DRIFT FILE
- 18.5. UTC, TIMEZONES, AND DST
- 18.6. AUTHENTICATION OPTIONS FOR NTP
- 18.7. MANAGING THE TIME ON VIRTUAL MACHINES
- 18.8. UNDERSTANDING LEAP SECONDS
- 18.9. UNDERSTANDING THE NTPD CONFIGURATION FILE
- 18.10. UNDERSTANDING THE NTPD SYSCONFIG FILE
- 18.11. DISABLING CHRONY
- 18.12. CHECKING IF THE NTP DAEMON IS INSTALLED
- 18.13. INSTALLING THE NTP DAEMON (NTPD)
- 18.14. CHECKING THE STATUS OF NTP
- 18.15. CONFIGURE THE FIREWALL TO ALLOW INCOMING NTP PACKETS
  - 18.15.1. Change the Firewall Settings
  - 18.15.2. Open Ports in the Firewall for NTP Packets
- 18.16. CONFIGURE NTPDATE SERVERS
- 18.17. CONFIGURE NTP
  - 18.17.1. Configure Access Control to an NTP Service
  - 18.17.2. Configure Rate Limiting Access to an NTP Service
  - 18.17.3. Adding a Peer Address
  - 18.17.4. Adding a Server Address
  - 18.17.5. Adding a Broadcast or Multicast Server Address
  - 18.17.6. Adding a Manycast Client Address
  - 18.17.7. Adding a Broadcast Client Address
  - 18.17.8. Adding a Manycast Server Address
  - 18.17.9. Adding a Multicast Client Address
  - 18.17.10. Configuring the Burst Option
  - 18.17.11. Configuring the iburst Option
  - 18.17.12. Configuring Symmetric Authentication Using a Key
  - 18.17.13. Configuring the Poll Interval
  - 18.17.14. Configuring Server Preference
  - 18.17.15. Configuring the Time-to-Live for NTP Packets
  - 18.17.16. Configuring the NTP Version to Use
- 18.18. CONFIGURING THE HARDWARE CLOCK UPDATE
- 18.19. CONFIGURING CLOCK SOURCES
- 18.20. ADDITIONAL RESOURCES
  - 18.20.1. Installed Documentation
  - 18.20.2. Useful Websites
CHAPTER 19. CONFIGURING PTP USING PTP4L
- 19.1. INTRODUCTION TO PTP
  - 19.1.1. Understanding PTP
  - 19.1.2. Advantages of PTP
- 19.2. USING PTP
- 19.3. USING PTP WITH MULTIPLE INTERFACES
- 19.4. SPECIFYING A CONFIGURATION FILE
- 19.5. USING THE PTP MANAGEMENT CLIENT
- 19.6. SYNCHRONIZING THE CLOCKS
- 19.7. VERIFYING TIME SYNCHRONIZATION
- 19.8. SERVING PTP TIME WITH NTP
- 19.9. SERVING NTP TIME WITH PTP
- 19.10. SYNCHRONIZE TO PTP OR NTP TIME USING TIMEMASTER
- 19.11. IMPROVING ACCURACY
- 19.12. ADDITIONAL RESOURCES
  - 19.12.1. Installed Documentation
  - 19.12.2. Useful Websites
PART VI. MONITORING AND AUTOMATION
CHAPTER 20. SYSTEM MONITORING TOOLS
- 20.1. VIEWING SYSTEM PROCESSES
- 20.2. VIEWING MEMORY USAGE
  - 20.2.1. Using the free Command
  - 20.2.2. Using the System Monitor Tool
- 20.3. VIEWING CPU USAGE
  - 20.3.1. Using the System Monitor Tool
- 20.4. VIEWING BLOCK DEVICES AND FILE SYSTEMS
- 20.5. VIEWING HARDWARE INFORMATION
- 20.6. CHECKING FOR HARDWARE ERRORS
- 20.7. MONITORING PERFORMANCE WITH NET-SNMP
- 20.8. ADDITIONAL RESOURCES
  - 20.8.1. Installed Documentation
CHAPTER 21. OPENLMI
- 21.1. ABOUT OPENLMI
  - 21.1.1. Main Features
  - 21.1.2. Management Capabilities
- 21.2. INSTALLING OPENLMI
  - 21.2.1. Installing OpenLMI on a Managed System
  - 21.2.2. Installing OpenLMI on a Client System
- 21.3. CONFIGURING SSL CERTIFICATES FOR OPENPEGASUS
- 21.4. USING LMISHELL
- 21.5. USING OPENLMI SCRIPTS
- 21.6. ADDITIONAL RESOURCES
CHAPTER 22. VIEWING AND MANAGING LOG FILES
- 22.1. LOCATING LOG FILES
- 22.2. BASIC CONFIGURATION OF RSYSLOG
- 22.3. USING THE NEW CONFIGURATION FORMAT
  - 22.3.1. Rulesets
  - 22.3.2. Compatibility with sysklogd
- 22.4. WORKING WITH QUEUES IN RSYSLOG
- 22.5. CONFIGURING RSYSLOG ON A LOGGING SERVER
  - 22.5.1. Using The New Template Syntax on a Logging Server
- 22.6. USING RSYSLOG MODULES
- 22.7. INTERACTION OF RSYSLOG AND JOURNAL
- 22.8. STRUCTURED LOGGING WITH RSYSLOG
- 22.9. DEBUGGING RSYSLOG
- 22.10. USING THE JOURNAL
- 22.11. MANAGING LOG FILES IN A GRAPHICAL ENVIRONMENT
- 22.12. ADDITIONAL RESOURCES
CHAPTER 23. AUTOMATING SYSTEM TASKS
- 23.1. SCHEDULING A RECURRING JOB USING CRON
  - 23.1.1. Prerequisites for Cron Jobs
  - 23.1.2. Scheduling a Cron Job
- 23.2. SCHEDULING A RECURRING ASYNCHRONOUS JOB USING ANACRON
  - 23.2.1. Prerequisites for Anacrob Jobs
  - 23.2.2. Scheduling an Anacron Job
    - Scheduling an anacron Job as root User
    - Scheduling Hourly, Daily, Weekly, and Monthly Jobs
- 23.3. SCHEDULING A JOB TO RUN AT A SPECIFIC TIME USING AT
  - 23.3.1. Prerequisites for At Jobs
  - 23.3.2. Scheduling an At Job
- 23.4. SCHEDULING A JOB TO RUN ON SYSTEM LOAD DROP USING BATCH
  - 23.4.1. Prerequisites for Batch Jobs
  - 23.4.2. Scheduling a Batch Job
- 23.5. SCHEDULING A JOB TO RUN ON NEXT BOOT USING A SYSTEMD UNIT FILE
- 23.6. ADDITIONAL RESOURCES
  - Installed Documentation
CHAPTER 24. AUTOMATIC BUG REPORTING TOOL (ABRT)
- 24.1. INTRODUCTION TO ABRT
- 24.2. INSTALLING ABRT AND STARTING ITS SERVICES
- 24.3. CONFIGURING ABRT
- 24.4. DETECTING SOFTWARE PROBLEMS
- 24.5. HANDLING DETECTED PROBLEMS
  - 24.5.1. Using the Command Line Tool
  - 24.5.2. Using the GUI
- 24.6. ADDITIONAL RESOURCES
PART VII. KERNEL CUSTOMIZATION WITH BOOTLOADER
CHAPTER 25. WORKING WITH GRUB 2
- 25.1. INTRODUCTION TO GRUB 2
  - Menu Entries in grub.cfg
- 25.2. CONFIGURING GRUB 2
- 25.3. MAKING TEMPORARY CHANGES TO A GRUB 2 MENU
- 25.4. MAKING PERSISTENT CHANGES TO A GRUB 2 MENU USING THE GRUBBY TOOL
- 25.5. CUSTOMIZING THE GRUB 2 CONFIGURATION FILE
- 25.6. PROTECTING GRUB 2 WITH A PASSWORD
- 25.7. REINSTALLING GRUB 2
- 25.8. UPGRADING FROM GRUB LEGACY TO GRUB 2
  - Prerequisites for upgrading
  - Upgrading from GRUB Legacy to GRUB 2 after the in-place upgrade of the operating system
- 25.9. GRUB 2 OVER A SERIAL CONSOLE
  - 25.9.1. Configuring the GRUB 2 Menu
  - 25.9.2. Using screen to Connect to the Serial Console
- 25.10. TERMINAL MENU EDITING DURING BOOT
- 25.11. UNIFIED EXTENSIBLE FIRMWARE INTERFACE (UEFI) SECURE BOOT
  - 25.11.1. UEFI Secure Boot Support in Red Hat Enterprise Linux 7
    - Restrictions Imposed by UEFI Secure Boot
- 25.12. ADDITIONAL RESOURCES
  - Installed Documentation
  - Installable and External Documentation
PART VIII. SYSTEM BACKUP AND RECOVERY
CHAPTER 26. RELAX-AND-RECOVER (REAR)
- 26.1. BASIC REAR USAGE
- 26.2. INTEGRATING REAR WITH BACKUP SOFTWARE
APPENDIX A. CHOOSING SUITABLE RED HAT PRODUCT
APPENDIX B. RED HAT CUSTOMER PORTAL LABS RELEVANT TO SYSTEM ADMINISTRATION
- ISCSI HELPER
- NTP CONFIGURATION
- SAMBA CONFIGURATION HELPER
- VNC CONFIGURATOR
- BRIDGE CONFIGURATION
- NETWORK BONDING HELPER
- LVM RAID CALCULATOR
- NFS HELPER
- LOAD BALANCER CONFIGURATION TOOL
- YUM REPOSITORY CONFIGURATION HELPER
- FILE SYSTEM LAYOUT CALCULATOR
- RHEL BACKUP AND RESTORE ASSISTANT
- DNS HELPER
- AD INTEGRATION HELPER (SAMBA FS - WINBIND)
- RED HAT ENTERPRISE LINUX UPGRADE HELPER
- REGISTRATION ASSISTANT
- RESCUE MODE ASSISTANT
- KERNEL OOPS ANALYZER
- KDUMP HELPER
- SCSI DECODER
- RED HAT MEMORY ANALYZER
- MULTIPATH HELPER
- MULTIPATH CONFIGURATION VISUALIZER
- RED HAT I/O USAGE VISUALIZER
- STORAGE / LVM CONFIGURATION VIEWER
APPENDIX C. REVISION HISTORY
- C.1. ACKNOWLEDGMENTS
INDEX

System Administrator's Guide Red Hat Enterprise Linux 7 Administrators En US

Red_Hat_Enterprise_Linux-7-System_Administrators_Guide-en-US

Red_Hat_Enterprise_Linux-7-System_Administrators_Guide-en-US

Red_Hat_Enterprise_Linux-7-System_Administrators_Guide-en-US

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