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  • Book Overview & Buying Mastering Linux Network Administration
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Mastering Linux Network Administration

Mastering Linux Network Administration

By : Jay LaCroix
4.6 (7)
Buy this Book
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Mastering Linux Network Administration

Mastering Linux Network Administration

4.6 (7)
By: Jay LaCroix
Buy this Book

Overview of this book

Linux is everywhere. Whether you run a home office, a small business, or manage enterprise systems, Linux can empower your network to perform at its very best. Armed with the advanced tools and best practice guidance of this practical guide, you'll be able to mold Linux networks to your will, empowering your systems and their users to take advantage of all that Linux-based networks have to offer. Understand how Linux networks function and get to grips with essential tips and tricks to manage them - whether you're already managing a networks, or even just starting out. With Debian and CentOS as its source, this book will divulge all the details you need to manage a real Linux-based network. With detailed activities and instructions based on real-world scenarios, this book will be your guide to the exciting world of Linux networking.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Setting up Your Environment
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1. Setting up Your Environment
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Getting started
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Distributions to consider
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Physical machines versus virtual machines
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Setting up and configuring VirtualBox
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Acquiring and installing Debian 8
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Acquiring and installing CentOS 7
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Summary
2
2. Revisiting Linux Network Basics
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2. Revisiting Linux Network Basics
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Understanding the TCP/IP protocol suite
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Naming the network device
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Understanding Linux hostname resolution
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Understanding the net-tools and iproute2 suites
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Manually managing network interfaces
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Managing connections with Network Manager
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Summary
3
3. Communicating Between Nodes via SSH
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3. Communicating Between Nodes via SSH
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Using OpenSSH
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Installing and configuring OpenSSH
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The OpenSSH config file
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Understanding and utilizing scp
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Generating public keys
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Keeping SSH connections alive
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Exploring an alternative to SSH – utilizing Mosh (mobile shell)
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Summary
4
4. Setting up a File Server
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4. Setting up a File Server
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File server considerations
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NFS v3 versus NFS v4
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Learning the basics of Samba
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Mounting network shares
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Automatically mounting network shares via fstab and systemd
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Creating networked filesystems with SSHFS
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Summary
5
5. Monitoring System Resources
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5. Monitoring System Resources
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Inspecting and managing processes
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Understanding load average
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Checking available memory
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Using shell-based resource monitors
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Scanning used storage
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Introduction to logging
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Maintaining log size with logrotate
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Understanding the systemd init system
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Understanding the systemd journal
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Summary
6
6. Configuring Network Services
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6. Configuring Network Services
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Planning your IP address layout
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Installing and configuring a DHCP server
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Installing and configuring a DNS server
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Setting up an internal NTP server
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Summary
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7. Hosting HTTP Content via Apache
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7. Hosting HTTP Content via Apache
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Installing Apache
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Configuring Apache
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Adding modules
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Setting up virtual hosts
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Summary
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8. Understanding Advanced Networking Concepts
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8. Understanding Advanced Networking Concepts
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Dividing your network into subnets
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Understanding the CIDR notation
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Implementing Quality of Service
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Routing TCP/IP traffic
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Creating redundant DHCP and DNS servers
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Summary
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9. Securing Your Network
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9. Securing Your Network
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Limiting the attack surface
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Securing OpenSSH
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Configuring the iptables firewall
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Protecting system services with fail2ban
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Understanding SELinux
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Configuring Apache to utilize SSL
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Deploying security updates
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Summary
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10. Troubleshooting Network Issues
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10. Troubleshooting Network Issues
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Tracing routing issues
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Troubleshooting DHCP issues
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Troubleshooting DNS issues
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Displaying connection statistics with netstat
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Scanning your network with Nmap and Zenmap
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Installing missing firmware on Debian systems
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Troubleshooting issues with Network Manager
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Summary
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Index
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Index

Troubleshooting issues with Network Manager

Network Manager is a tool that is used to manage network connections in Linux. It consists of a daemon that runs in the background, as well as an optional graphical utility that most desktop distributions include to show you your connection status at any given time. Network Manager is not required by any means, but it simplifies the management of your network interfaces and their configuration. In a lot of real-world networks, Network Manager is typically disabled and static IP addresses are used instead. As I've mentioned probably a hundred times so far, I always prefer static leases over static IPs. With a static IP, you do not have the central point of management, and would need to track down and change a server's IP address manually. It is for this reason that I recommend you to keep Network Manager running. It will watch for connections, activate your DHCP client, and then receive an IP address lease from your DHCP server. If you...

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Mastering Linux Network Administration
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