CentOS Quick Start Guide电子书

Title Page

Copyright and Credits

CentOS Quick Start Guide

Dedication

About Packt

Why subscribe?

Packt.com

Contributors

About the author

About the reviewer

Packt is searching for authors like you

Preface

Who this book is for

What this book covers

To get the most out of this book

Conventions used

Get in touch

Reviews

Getting Started with CentOS 7

Preparing to install CentOS 7

Getting the right hardware

Getting the software

Finalizing server setup details

Performing manual installation

Accessing the command line using the console

Starting a Terminal

Command-line syntax and structure

Exiting the shell

Introducing the Bash shell

Bash shell and command execution

Tab completion

Command-line editing shortcuts

The history command

Command aliases

Listing current aliases

Setting an alias

Removing an alias

Summary

Command-Line and Filesystem Navigation

Understanding the CentOS 7 filesystem hierarchy

Using man pages and the help command

Different types of documentation available in Linux

Using the man command

Using the GNU info command

Using the help command and the --help option

Other sources of documentation

Managing filenames with path expansion

File globbing

Wildcard expansion

Tilde expansion

Brace expansion

Command substitution

Quoting and escaping

File naming conventions

Managing files using command-line tools

Navigation commands

File management commands

Managing archives and compressed files

Compression

gzip and gunzip compression

bzip2 and bunzip2 compression

xz compression

zip

Archiving

Archiving with tar

Archiving and compression (.gzip) using tar

Archiving, compression (.bzip2), and listing contents using tar

Archiving and compression (.xz) using tar

Summary

Managing Text Files

Different methods to create a text file

Create a text file using the cat command

Create an empty text file using the touch command

Create a text file using the redirection symbol (>)

Create a text file using the echo or printf command

Create a text file using the vi editor

Editing files with the vi editor

Working with files in vi editor

Insert Mode

Line Mode

Determining line numbers in Line Mode of vi editor

How to execute external commands in Line Mode

Command Mode

Using text file manipulation tools

Different types of editor used to view file content

less command

more command

cat command

tac command

head command

tail command

wc command

file command

Viewing compressed files

cut command

sort command

uniq command

paste command

Redirecting output to files and programs

Pipes

tee command

Using grep for text matching

Text extraction using sed and awk

sed

awk

Finding a file (locate and find commands)

Locate

Find

Summary

User and Group Management

Understanding users and groups in CentOS 7

Defining a user

Identifying the current user

Understanding groups in Linux

Executing commands as superuser in CentOS 7

Switching users with the su command

Disadvantages of using the su command to grant root access to a normal user

Using sudo to run commands as the root user

Creating, modifying, or deleting local user accounts

Creating a user with the useradd command

Modifying a user with the usermod command

Deleting a user account with the userdel command

Creating, modifying, or deleting local group accounts

Creating supplementary groups with groupadd

Modifying existing groups with the groupmod command

Deleting a group with the groupdel command

Managing user passwords and aging policies

Setting a user password using the passwd command

Understanding the shadow password file

Understanding password aging parameters

Restricting user access

Fake shell or nologin shell

Summary

Managing File Permissions

Understanding Linux filesystem permissions

Effect of permissions on files and directories

Viewing applied permissions and ownership

Managing file permissions

Modifying file permissions with chmod using symbols

Managing file permissions with chmod using numbers

Managing file ownership

Understanding default ownership

Modifying user ownership with chown

Modifying group ownership with chown

Modifying both user and group ownership with chown

Modifying group ownership with chgrp

Special permissions

Modifying special permissions for files

Modifying special permission, for directories

Using sticky bit

Using setgid

Managing default permissions

Understanding umask

Managing ACL on files

Viewing ACL permissions

Using getfacl

ACL mask

Modifying ACL permissions

Using setfacl

Removing an ACL

Summary

Process Management

Understanding processes

Defining a process

Process creation on a Linux system

Processes types

Interactive processes

Batch processes

Daemons

Threads

Kernel threads

Process states

Viewing current processes

Listing running processes

The ps command

Displaying processes running from the current shell

Displaying all processes by their user

Displaying all processes in different formats

Sorting processes based on different parameters

Displaying processes by user

Displaying process information by name

Displaying process details by PID

Displaying a process hierarchy in a tree style

Displaying the child processes of a parent

Displaying the thread of a process

Displaying the pid of a process if the process name is known

Using the pstree command

Finding the PID of a running process

Using the pgrep command

pidof

The ps command with grep

Communicating with processes using signals

Defining a signal and its types

Sending signals to processes

Sending signals to processes by PID using the kill command

Sending signals to multiple processes by name

killall

pkill

Monitoring processes and load averages

Understanding load averages on Linux

uptime

w

Real-time interactive process monitoring

top

Managing a processes' priority with nice and renice

Understanding priority

Modifying priority

Viewing the priority of a process

Modifying the priority of a new process (nice value)

Modifying the priority of a running process (renice)

Controlling jobs on the command line

Understanding different terms related to job management

Jobs management with its associated controlling Terminal

Foreground processes or jobs

Background processes or jobs

Suspending a foreground process to the background

Managing jobs in the background

Summary

Managing Networking in CentOS

Linux networking concepts

Common terms used in Linux networking

IP address

IPv4

IPv6

Different classes of IP addressing

Public classes

Private classes

Loopback address

Link-local address or APIPA

Netmask

Gateway

Hostname

Nameserver

NetworkManager

Network interface naming conventions

Using Linux networking commands

Viewing IP address details

Using the IP command

Using ifconfig command

Netstat

Viewing the routing information

Using the ip route command

Using route command

Using netstat command

Gateway

Viewing nameserver details

Network troubleshooting utilities

Using ethtool command

Using ping command

Using tracepath command

Using traceroute command

Using mtr command

Verifying DNS connectivity

Using nslookup command

Using host command

Using dig command

Finding local ports and services information

Using the ss command

Using the netstat command

Web utilities

Graphical and non-graphical web browsers

Command-line file downloader (wget)

Command-line download and upload using curl

Managing a network with nmcli

Defining basic terms

Device or interface

Connection

Displaying network information using nmcli

Creating network connections using nmcli

Modifying network interfaces using nmcli

Editing network configuration files

Configuring networking options in static and dynamic modes

Configuring hostnames and name resolutions

Displaying and modifying the hostname

Modifying nameservers (DNS sever)

Accessing remote logins with SSH

Understanding OpenSSH

Executing commands over SSH remotely

Key-based SSH authentication

Configuring ssh-keygen for password-less authentication

Creating a SSH key pair

Configuring and securing SSH logins

Transferring files in Linux

Secure file transfer using SCP

Local to remote filesystem file transfer

Remote to local filesystem file transfer

Synchronizing files using rsync

Synchronizing data locally from one folder to another for backup

Synchronizing data from a local to remote host filesystem

Synchronizing data from remote host to local filesystem

Summary

Software Package Management

Managing applications using RPM

Anatomy of a RPM

What happens when you update an application

Using RPM to query options with RPM packages

Verifying RPM package signatures

Using RPM to install packages

Using rpm to remove packages

Using RPM to upgrade packages

Using RPM to verify packages

Importing a RPM GPG key

Managing applications using YUM

Understanding the YUM package manager

Using the YUM command line

Finding an application using yum

Installing applications using YUM

Displaying packages and their information with YUM

Removing applications using yum

Updating applications and the system using yum

Managing groups of applications using YUM

Using YUM history

Managing application repositories using YUM

Handling other miscellaneous options of yum

Managing official and third-party repositories

Official repositories of CentOS 7

Third-party repositories

Creating custom repositories

Summary

Overview of Essential Advance Utilities

Understanding system logging

Working with rsyslog

Configuring rsyslogd sections

Rsyslogd facilities and priorities

Rsyslogd rules

Log file rotation

Analyzing syslog entries

Monitoring live log file traffic using the tail command

Using the logger command

Working with systemd-journald

Finding events with the journalctl command

Configuring systemd-journald to store logs persistently

Understanding how to control the system and services

Defining essential terms

What is a daemon?

What is a socket?

What is systemd?

What are units?

What is systemctl?

Working with systemd and systemctl

Viewing states of service with systemctl

Viewing unit files with systemctl

Unit dependencies and unit file structure

Managing daemons using systemctl

Masking services

Controlling the boot process using systemd

What are systemd targets?

Switching your targets at runtime

Changing the default target of the system

Understanding SELinux concepts

SELinux contexts

Viewing SELinux context

Working with SELinux

Changing SELinux modes

Using setenforce for runtime changes

Setting default modes of SELinux

Modifying file context

Using restorecon for restoring the default context

Using chon for context management

Using semanage for context management

Modifying port context

Managing SELinux Booleans

Managing SELinux troubleshooting

Using sealert for troubleshooting

Understanding firewall concepts in CentOS 7

Firewalld concepts

Firewalld zones

Firewalld services

Managing firewalld

Using the firewalld-cmd command-line tool

Using the firewalld-config graphical tool

Working with firewalld

Summary

Other Books You May Enjoy

Leave a review - let other readers know what you think