Book Image

Linux for System Administrators

By : Viorel Rudareanu, Daniil Baturin
Book Image

Linux for System Administrators

By: Viorel Rudareanu, Daniil Baturin

Overview of this book

Linux system administration is an essential aspect of maintaining and managing Linux servers within an organization. The role of a Linux system administrator is pivotal in ensuring the smooth functioning and security of these servers, making it a critical job function for any company that relies on Linux infrastructure. This book is a comprehensive guide designed to help you build a solid foundation in Linux system administration. It takes you from the fundamentals of Linux to more advanced topics, encompassing key areas such as Linux system installation, managing user accounts and filesystems, networking fundamentals, and Linux security techniques. Additionally, the book delves into the automation of applications and infrastructure using Chef, enabling you to streamline and optimize your operations. For both newcomers getting started with Linux and professionals looking to enhance their skills, this book is an invaluable hands-on guide with a structured approach and concise explanations that make it an effective resource for quickly acquiring and reinforcing Linux system administration skills. With the help of this Linux book, you’ll be able to navigate the world of Linux administration confidently to meet the demands of your role.
Table of Contents (21 chapters)
Part 1: Linux Basics
Part 2: Configuring and Modifying Linux Systems
Part 3: Linux as a Part of a Larger System

The network-scripts configuration file

In Linux, network-scripts is used to configure network interfaces. These scripts are located in the /etc/sysconfig/network-scripts directory and define the network settings for each interface, such as the IP address, netmask, gateway, and DNS servers (network file configuration path is specific to CentOS).

The network-scripts is written in Bash and consists of several configuration files, each corresponding to a specific network interface. The most commonly used configuration files are ifcfg-ethX for Ethernet interfaces and ifcfg-wlanX for wireless interfaces, where X is the interface number.

The ifcfg-ethX configuration file contains the following parameters:

  • DEVICE: This parameter specifies the name of the network interface – for example, DEVICE=eth0.
  • BOOTPROTO: This parameter specifies whether the interface should use DHCP or a static IP address. If DHCP is used, the parameter’s value is set to dhcp. If a static...