CentOS Quick Start Guide: Get up and running with CentOS server administration 9781789344875, 1789344875

Table of contents :
Cover
Title Page
Copyright and Credits
Dedication
About Packt
Contributors
Table of Contents
Preface
Chapter 1: 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
Chapter 2: 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
Chapter 3: 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
Chapter 4: 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
Chapter 5: 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
Chapter 6: 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
Chapter 7: 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
Chapter 8: 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
Chapter 9: 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
Index