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xref:servers/Mail_Servers.adoc[Mail Servers] reviews modern email protocols in use today, and some of the programs designed to send and receive email, including [application]*Postfix*, [application]*Sendmail*, [application]*Fetchmail*, and [application]*Procmail*. Read this chapter if you need to configure a mail server on your system.
xref:servers/Directory_Servers.adoc[Directory Servers] covers the installation and configuration of [application]*OpenLDAP*, an open source implementation of the LDAPv2 and LDAPv3 protocols. Read this chapter if you need to configure a directory server on your system.
xref:servers/File_and_Print_Servers.adoc[File and Print Servers] guides you through the installation and configuration of [application]*Samba*, an open source implementation of the Server Message Block (SMB) protocol, and [application]*vsftpd*, the primary FTP server shipped with {MAJOROS}. Additionally, it explains how to use the [application]*Printer Configuration* tool to configure printers. Read this chapter if you need to configure a file or print server on your system.
xref:servers/Configuring_NTP_Using_the_chrony_Suite.adoc[Configuring NTP Using the chrony Suite] covers the installation and configuration of the [application]*chrony* suite, a client and a server for the Network Time Protocol (`NTP`). Read this chapter if you need to configure the system to synchronize the clock with a remote `NTP` server, or set up an `NTP` server on this system.
xref:servers/Configuring_NTP_Using_ntpd.adoc[Configuring NTP Using ntpd] covers the installation and configuration of the `NTP` daemon, `ntpd`, for the Network Time Protocol (`NTP`). Read this chapter if you need to configure the system to synchronize the clock with a remote `NTP` server, or set up an `NTP` server on this system, and you prefer not to use the [application]*chrony* application.
xref:servers/Configuring_PTP_Using_ptp4l.adoc[Configuring PTP Using ptp4l] covers the installation and configuration of the Precision Time Protocol application, [application]*ptp4l*, an application for use with network drivers that support the Precision Network Time Protocol (`PTP`). Read this chapter if you need to configure the system to synchronize the system clock with a master `PTP` clock.
xref:monitoring-and-automation/System_Monitoring_Tools.adoc[System Monitoring Tools] discusses applications and commands that can be used to retrieve important information about the system. Read this chapter to learn how to gather essential system information.
xref:monitoring-and-automation/Viewing_and_Managing_Log_Files.adoc[Viewing and Managing Log Files] describes the configuration of the `rsyslog` daemon, and explains how to locate, view, and monitor log files. Read this chapter to learn how to work with log files.
xref:monitoring-and-automation/Automating_System_Tasks.adoc[Automating System Tasks] provides an overview of the [command]#cron#, [command]#at#, and [command]#batch# utilities. Read this chapter to learn how to use these utilities to perform automated tasks.
xref:monitoring-and-automation/OProfile.adoc[OProfile] covers [application]*OProfile*, a low overhead, system-wide performance monitoring tool. Read this chapter for information on how to use [application]*OProfile* on your system.
xref:kernel-module-driver-configuration/intro-kernel-module-driver-configuration.adoc[Kernel, Module and Driver Configuration]
xref:kernel-module-driver-configuration/Working_with_the_GRUB_2_Boot_Loader.adoc[Working with the GRUB 2 Boot Loader] der>> describes the GNU GRand Unified Boot loader (GRUB) version 2 boot loader, which enables selecting an operating system or kernel to be loaded at system boot time.
xref:kernel-module-driver-configuration/Manually_Upgrading_the_Kernel.adoc[Manually Upgrading the Kernel] provides important information on how to manually update a kernel package using the [command]#rpm# command instead of [command]#dnf#. Read this chapter if you cannot update a kernel package with the [application]*DNF* package manager.
xref:kernel-module-driver-configuration/Working_with_Kernel_Modules.adoc[Working with Kernel Modules] explains how to display, query, load, and unload kernel modules and their dependencies, and how to set module parameters. Additionally, it covers specific kernel module capabilities such as using multiple Ethernet cards and using channel bonding. Read this chapter if you need to work with kernel modules.
This appendix concentrates on the RPM Package Manager (RPM), an open packaging system used by {MAJOROS}, and the use of the [command]#rpm# utility. Read this appendix if you need to use [command]#rpm# instead of [command]#dnf#.
This appendix looks at Wayland, a new display server used in GNOME for {MAJOROS} and how to troubleshoot issues with the Wayland display server.
Certain portions of this text first appeared in the [citetitle]_Red{nbsp}Hat Enterprise{nbsp}Linux{nbsp}7 System Administrator's Guide_, copyright © 2014–{YEAR} Red{nbsp}Hat, Inc., available at link:++https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/index.html++[].
xref:monitoring-and-automation/System_Monitoring_Tools.adoc#sect-System_Monitoring_Tools-Net-SNMP[Monitoring Performance with Net-SNMP] is based on an article written by Michael Solberg.
The authors of this book would like to thank the following people for their valuable contributions: Adam Tkáč, Andrew Fitzsimon, Andrius Benokraitis, Brian Cleary Edward Bailey, Garrett LeSage, Jeffrey Fearn, Joe Orton, Joshua Wulf, Karsten Wade, Lucy Ringland, Marcela Mašláňová, Mark Johnson, Michael Behm, Miroslav Lichvár, Radek Vokál, Rahul Kavalapara, Rahul Sundaram, Sandra Moore, Zbyšek Mráz, Jan Včelák, Peter Hutterer, T.C. Hollingsworth, and James Antill, among many others.