Linux Tutorials - Herong's Tutorial Examples

∟Installing CentOS

∟Reset Host Name on Linux Systems

This section provides a tutorial example on how to view and change host name settings on Linux systems.

After installing a new Linux system, you want to check and reset its host name with more meaningful name.

1. View the current host name using the "hostname" command. I see the default host name "localhost.localdomain" on my CentOS computer. 

herong$ hostname

localhost.localdomain

2. Reset the host name with "hostnamectl set-hostname" command. "mail" is used to identify this computer as the Mail server. 

herong$ sudo hostnamectl set-hostname mail

herong$ hostname
mail

3. Look at hostname file on the system. You can actually set the host name by editing this file. 

herong$ sudo more /etc/hostname
mail

4. Map host name to IP address. 

herong$ sudo vi /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.100 mail.herongyang.com mail

Table of Contents

 About This Book

 Introduction to Linux Systems

 Cockpit - Web Portal for Administrator

 Process Management

 Files and Directories

 Users and Groups

 File Systems

 Block Devices and Partitions

 LVM (Logical Volume Manager)

►Installing CentOS

 Create CentOS Bootable USB

 Install CentOS from Bootable USB

 Install CentOS by Deleting Existing Partition

 Reset Timezone on Linux Systems

►Reset Host Name on Linux Systems

 Update All Installed Packages

 SELinux - Security-Enhanced Linux

 Network Connection on CentOS

 Internet Networking Tools

 SSH Protocol and ssh/scp Commands

 Software Package Manager on CentOS - DNF and YUM

 vsftpd - Very Secure FTP Daemon

 LDAP (Lightweight Directory Access Protocol)

 Administrative Tasks

 References

 Full Version in PDF/EPUB