CentOS System Administration Essentials by Mallett, Andrew -- Read -- Imperial Library of Trantor

Index

CentOS System Administration Essentials

Table of Contents CentOS System Administration Essentials Credits About the Author About the Reviewers www.PacktPub.com

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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

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

Summary

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 Summary

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/

Summary

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

Summary

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 Summary

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 Summary

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 Summary

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

Summary

10. Security Central

Understanding PAM configuration files

Type Control The module path Module arguments

Limits of PAM

Domain Type 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

Summary

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

Summary

Index

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