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  • Book Overview & Buying CentOS System Administration Essentials
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CentOS System Administration Essentials

CentOS System Administration Essentials

By : Andrew Mallett
4.2 (13)
Buy this Book
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CentOS System Administration Essentials

CentOS System Administration Essentials

4.2 (13)
By: Andrew Mallett
Buy this Book

Overview of this book

If you are a Linux administrator who is looking to gain knowledge that differentiates yourself from the crowd, then this is the book for you. Beginners who have a keen interest to learn more about Linux administration will also progress quickly with this resourceful learning guide.
Table of Contents (13 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. Taming vi
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1. Taming vi
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CLI trickery – shortcuts that you will love
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Vim and vi
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Getting the .vimrc setup the way you like
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Search and replace
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Learning to remove extraneous comments from a file with a few deft key strokes
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Summary
2
2. Cold Starts
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2. Cold Starts
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The GRUB and MBR
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When is the root filesystem not the root filesystem?
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Working on the GRUB console
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Protecting the GRUB menu with passwords
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Boot splashing with plymouth
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Summary
3
3. CentOS Filesystems – A Deeper Look
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3. CentOS Filesystems – A Deeper Look
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A magician's secret
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Special permissions
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Naming your pipes
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Understanding the command stat
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Enterprise filesystem shootout
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Using BTRFS snapshots
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Summary
4
4. YUM – Software Never Looked So Good
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4. YUM – Software Never Looked So Good
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Managing software installation with RPM files
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Creating your own RPM file
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Creating a YUM Repository
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Summary
5
5. Herding Cats – Taking Control of Processes
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5. Herding Cats – Taking Control of Processes
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Managing services with Upstart
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Creating your own Upstart script
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Managing processes
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Summary
6
6. Users – Do We Really Want Them?
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6. Users – Do We Really Want Them?
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Managing public and private groups
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Getent
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Quotas
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Scripting user creation
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Summary
7
7. LDAP – A Better Type of User
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7. LDAP – A Better Type of User
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LDAP concepts
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Installing 389-ds
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LDAP user account management
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LDAP authentication
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Summary
8
8. Nginx – Deploying a Performance-centric Web Server
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8. Nginx – Deploying a Performance-centric Web Server
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Installing and configuring Nginx
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Installing PHP
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Installing MySQL
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Create dynamic web content
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Summary
9
9. Puppet – Now You Are the Puppet Master
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9. Puppet – Now You Are the Puppet Master
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Installing the Puppet master
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Puppet resource
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Managing packages, services, and files
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Summary
10
10. Security Central
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10. Security Central
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Understanding PAM configuration files
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Limits of PAM
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SELinux
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Hardening Linux
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Summary
11
11. Graduation Day
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11. Graduation Day
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Securing remote access to your system
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Best practices of OpenLDAP
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Best practices of Nginx
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Mastering Puppet
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What's new in CentOS 7
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Summary
12
Index
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Index

Special permissions

The permissions or mode of a file you we will be familiar with is Read, Write, and eXecute (RWX). These permissions can be set to the three objects:

  • User

  • Group

  • Others

The standard permissions are shown with their octal notation, should you want a quick revision exercise, as follows:

There is a fourth block of permissions that precedes user, group, and others. This block is for the special permissions; however, rather than representing RWX, the permissions comprise of:

  • The set user ID (SUID) bit

  • The set group ID (SGID) bit

  • The sticky bit

Using symbolic notations, these permissions can be added to file1, which acts as our axiom for the filename during the following demonstration:

$ chmod u+s file1 #adding the SUID Bit
$ chmod g+s file1 #adding the SGID Bit
$ chmod o+t file1 #adding the Sticky Bit

The SUID bit

The set user ID bit is used when a program needs to run using another user ID other than the user running the program. When set, the program runs with the permissions of the...

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Tech Concepts
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Programming languages
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CentOS System Administration Essentials
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