CentOS system administration essentials : become an efficient CentOS administrator by acquiring real-world knowledge of system setup and configuration / Andrew Mallett ; cover image by Bartosz Chucherko.

Format:

Book

Author/Creator:

Mallett, Andrew, author.

Contributor:

Chucherko, Bartosz, cover designer.

Series:

Community experience distilled.

Community Experience Distilled

Language:

English

Subjects (All):

Linux.

Operating systems (Computers).

Physical Description:

1 online resource (1 volume) : illustrations.

Edition:

1st edition

Place of Publication:

Birmingham, England : Packt Publishing, 2014.

System Details:

text file

Summary:

Become an efficient CentOS administrator by acquiring real-world knowledge of system setup and configuration In Detail CentOS is widely respected as a very powerful and flexible Linux distribution, and it can be used as a web server, file server, FTP server, domain server, or a multirole solution. It is designed to handle the more demanding needs of business applications such as network and system administration, database management, and web services. CentOS is self-sufficient and fast while working, with the added benefit of global acceptance as a large number of the world's web servers run on it. This book not only concentrates on the basics, but also supplements your existing knowledge on subject areas that are important in the Enterprise market, such as directory services, security configuration management, and web-based architecture. By the end of this book, you will be able to manage an Enterprise Linux network focused on management-centralized configuration, user management, and filesystem enhancements by covering everything from the latest filesystem advances with BTRFS through to learning about the new web server on the block - Nginx. What You Will Learn Conquer the command line using shortcuts in the shell and within the editor Vim Analyze the booting of CentOS utilizing MBR, GRUB, and Plymouth Gain an understanding of the filesystem structure of hard links, inodes, and data using stat and ls Manage your software installations with YUM Handle your services as they begin to migrate from System V scripts Establish centralized account information using openLDAP directory services Centralize the configuration management of CentOS using Puppet, enabling updates from Puppet Master to be distributed to the clients

Contents:

Intro

CentOS System Administration Essentials

Table of Contents

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the color images of this book

Errata

Piracy

Questions

1. Taming vi

CLI trickery - shortcuts that you will love

Vim and vi

Getting the .vimrc setup the way you like

Search and replace

Learning to remove extraneous comments from a file with a few deft key strokes

Summary

2. Cold Starts

The GRUB and MBR

When is the root filesystem not the root filesystem?

Editing stanzas in GRUB

Adding a root entry to a stanza

Adding a kernel entry to a stanza

Adding an initrd entry to a stanza

Working on the GRUB console

Protecting the GRUB menu with passwords

Boot splashing with plymouth

Applying different themes

3. CentOS Filesystems - A Deeper Look

A magician's secret

Hard links

Symbolic links

Special permissions

The SUID bit

The SGID bit

The sticky bit

Naming your pipes

Understanding the command stat

The last access time

The last modified time

The last changed time

Enterprise filesystem shootout

What BTRFS has to offer

Installing BTRFS

Creating a BTRFS filesystem

Expanding a BTRFS filesystem

Volume management with BTRFS

Balancing the filesystem

Adding an entry to /etc/fstab

Creating an RAID1 mirror

Using BTRFS snapshots

4. YUM - Software Never Looked So Good

Managing software installation with RPM files

Creating your own RPM file.

Creating the Plymouth theme

tup.plymouth

tup.script

Creating the theme RPM

Using YUM

YUM plugins

Creating a YUM Repository

/etc/yum.repos.d/

5. Herding Cats - Taking Control of Processes

Managing services with Upstart

Creating your own Upstart script

Managing processes

Using the pgrep command

Using the pstree command

Using the pkill command

Using the pmap command

6. Users - Do We Really Want Them?

Managing public and private groups

Linux groups

Adding users to groups

Evaluating private group usage

Getent

Quotas

Setting quotas

Scripting user creation

7. LDAP - A Better Type of User

LDAP concepts

Installing 389-ds

Configuring DNS or hostname records

Setting TCP keepalives

Setting file descriptors

Creating the directory server user and group

The EPEL repository

Installing and configuring 389-ds

Testing the installation

LDAP user account management

Adding users using the GUI console

Adding users from the command line

LDAP authentication

8. Nginx - Deploying a Performance-centric Web Server

Installing and configuring Nginx

Installing Nginx

Configuring Nginx

Configuring a 404 Document Not Found Error page

Installing PHP

Installing MySQL

Create dynamic web content

9. Puppet - Now You Are the Puppet Master

Installing the Puppet master

Configuring the firewall

DNS

Network Time Protocol

The Puppet lab repository

Puppet resource

Managing packages, services, and files

Classes

Resource definition

Puppet facts

Using include

Creating and testing manifests

Enrolling remote puppet agents

10. Security Central

Understanding PAM configuration files

Type

Control

The module path

Module arguments

Limits of PAM.

Domain

Item

SELinux

Reading the current SELinux mode

Setting the SELinux mode

Preventing mode changes from the command line

Understanding SELinux contexts

Troubleshooting SELinux

Hardening Linux

Password auditing

Preparing a password file

Cracking passwords

Weakening the algorithm

Hardening the password

11. Graduation Day

Securing remote access to your system

The SSH public key

Analyzing the risks of default settings

Populating the keystore

Public key authentication

Root logins

Conclusion

Best practices of OpenLDAP

Best practices of Nginx

Mastering Puppet

What's new in CentOS 7

Locale

Time and date information

Managing services

Additional ways to repair your machine than just using the single user mode

Remote management

Systemd and nonstandard subcommands

The Samba 4.1 package

Filesystem changes

Password policies

Index.

Notes:

Includes index.

Description based on online resource; title from PDF title page (ebrary, viewed December 16, 2014).

ISBN:

9781783985937

1783985933

OCLC:

899214553