Learning RHEL Networking电子书

Learning RHEL Networking

Table of Contents

Learning RHEL Networking

Credits

About the Author

About the Reviewers

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Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Errata

Piracy

Questions

1. Introducing Enterprise Linux 7

Red Hat Enterprise Linux

CentOS

Fedora

Determining your distribution and version

The /etc/system-release file

The /etc/issue file

Using lsb_release

Determining the kernel version

Summary

2. Configuring Network Settings

Elevating privileges

The su command

Delegating with the sudo command

Using ip and hostnamectl

Consistent naming for network devices

A real-life network device naming example

Disabling consistent network device naming

Using the ip command to display configurations

Using the ip command to implement configuration changes

Persisting network configuration changes

Configuring the RHEL 7 hostname with hostnamectl

Introduction to the Red Hat NetworkManager

Interacting with the NetworkManager using the Control Center

Adding a new profile with the Control Center

Interacting with the NetworkManager using nmtui

Extreme interaction with NetworkManager using nmcli

Summary

3. Configuring Key Network Services

Domain Name System

Installing and configuring a Caching Only DNS server

Configuring clients to use this server

Configuring the DNS zone

Referencing the zone from /etc/named.conf

Creating the zone file

Configuring a DHCP server

Configuring time services on RHEL 7

Implementing chronyd

Implementing ntpd

Implementing PTP on RHEL 7

Implementing e-mail delivery on RHEL 7

Adding an MX record to the DNS server

Summary

4. Implementing iSCSI SANs

The iSCSI target (server)

Managing logical volumes with LVM

Partitioning the disk

Creating the physical volume

Creating the volume group

Creating logical volumes

Installing the targetd service and targetcli tools

Managing iSCSI targets with targetcli

Creating storage backstores

Creating iSCSI targets

Adding LUNS to the iSCSI target

Adding ACLS

Working with the iSCSI Initiator

Summary

5. Implementing btrfs

Overview of btrfs

Overview of the lab environment

Installing btrfs

Creating the btrfs filesystem

The Copy-On-Write technology

Resizing btrfs filesystems

Adding devices to the btrfs filesystem

Volume management the old way

Volume management with btrfs

Balancing the btrfs filesystem

Mounting multidisk btrfs volumes from /etc/fstab

Creating a RAID1 mirror

Using btrfs snapshots

Optimizing btrfs for solid state drives

Managing snapshots with snapper

Summary

6. File Sharing with NFS

An overview of NFS

Overview of the lab environment

The NFS server configuration

Simple exports

Advanced exports

Pseudo-root

Using exportfs to create temporary exports

Hosting NFSv4 behind a firewall

Hosting NFSv3 behind a firewall

Diagnosing NFSv3 issues

Using static ports for NFSv3

Configuring the NFS client

Auto-mounting NFS with autofs

Summary

7. Implementing Windows Shares with Samba 4

An overview of Samba and Samba services

An overview of the lab environment

Configuring time and DNS

Managing Samba services

The Samba client on RHEL 7

Configuring file shares in Samba

Troubleshooting Samba

Summary

8. Integrating RHEL 7 into Microsoft Active Directory Domains

Overview of identity management

An overview of the lab environment

Preparing to join an Active Directory domain

Using realm to manage domain enrolment

Logging on to RHEL 7 using Active Directory credentials

User and group management with adcli

Listing the Active Directory information

Creating Active Directory users

Creating Active Directory groups

Managing the Active Directory group membership

Delegating Active Directory accounts with sudo

Leaving a domain

Understanding Active Directory as an identity provider for sssd

Configuring NSS

Configuring PAM

Configuring Kerberos

Configuring SSSD

Summary

9. Deploying the Apache HTTPD Server

Configuring the httpd service

Installing Apache 2.4

The configuration

Configuring the DocumentRoot directory

Controlling the Apache web service

Setting up the server name

Setting up a custom error page

Loading modules

Virtual servers

Name-based

The name resolution

The Apache configuration

IP-based

Port-based

Automating virtual hosts

Summary

10. Securing the System with SELinux

What is SELinux

Understanding SELinux

Modes

The disabled mode

The permissive mode

The enforcing mode

Labels

Policy types

Minimum

Targeted

MLS

Policies

Working with the targeted policy type

Unconfined domains

SELinux tools

chcon and restorecon

Boolean values

Troubleshooting SELinux

The log file

The audit2allow command

Permissive domains

Summary

11. Network Security with firewalld

The firewall status

Routing

Zone management

Source management

Firewall rules using services

Firewall rules using ports

Masquerading and Network Address Translation

Using rich rules

Implementing direct rules

Reverting to iptables

Summary

Index