Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you about how to modify the host name in CentOS 7. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

How to modify the hostname on CentOS 7

In CentOS, there are three defined hostnames: static, transient, and pretty. The "static" hostname, also known as the kernel hostname, is the hostname that the system initializes automatically from / etc/hostname at startup. "transient" hostnames are hostnames temporarily assigned while the system is running, for example, through DHCP or mDNS servers. Both static and transient hostnames follow the same character restrictions as Internet domain names. "flexible" hostnames, on the other hand, allow the use of free-form hostnames (including special / white space characters) to be presented to end users, such as Linuxidc.

In CentOS 7, there is a command-line tool called hostnamectl that allows you to view or modify configurations related to hostnames.

1. To view settings related to the hostname:

[root@localhost ~] # hostnamectl

Static hostname: localhost.localdomain

Icon name: computer

Chassis: n/a

Machine ID: 80a4fa4970614cf6be9597ecd6f097a9

Boot ID: 28420e272e1847a583718262758bd0f7

Virtualization: vmware

Operating System: CentOS Linux 7 (Core)

CPE OS Name: cpe:/o:centos:centos:7

Kernel: Linux 3.10.0-123.el7.x86_64

Architecture: x86_64

Or

[root@localhost ~] # hostnamectl status

Static hostname: localhost.localdomain

Icon name: computer

Chassis: n/a

Machine ID: 80a4fa4970614cf6be9597ecd6f097a9

Boot ID: 28420e272e1847a583718262758bd0f7

Virtualization: vmware

Operating System: CentOS Linux 7 (Core)

CPE OS Name: cpe:/o:centos:centos:7

Kernel: Linux 3.10.0-123.el7.x86_64

Architecture: x86_64

two。 View only static, transient, or flexible hostnames, using the "--static", "--transient", or "--pretty" options, respectively.

[root@localhost] # hostnamectl-- static

Localhost.localdomain

[root@localhost] # hostnamectl-- transient

Localhost.localdomain

[root@localhost] # hostnamectl-- pretty

3. To modify all three hostnames at once: static, transient, and flexible hostnames:

[root@localhost ~] # hostnamectl set-hostname Linuxidc

[root@localhost] # hostnamectl-- pretty

Linuxidc

[root@localhost] # hostnamectl-- static

Linuxidc

[root@localhost] # hostnamectl-- transient

Linuxidc

As shown above, when you modify a static / transient hostname, any special or white space characters are removed, and any uppercase letters in the supplied parameters are automatically converted to lowercase. Once the static hostname is modified, / etc/hostname will be updated automatically. However, / etc/hosts will not be updated to save your changes, so be sure to manually update / etc/hosts every time you change the hostname, and then restart CentOS 7. Otherwise, the system will be slow to restart.

4. Manual update / etc/hosts

Vim / etc/hosts

127.0.0.1 Linuxidc hunk_zhu

# 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain

:: 1 localhost localhost.localdomain localhost6 localhost6.localdomai

5. After restarting CentOS 7 (reboot-f)

[root@Linuxidc ~] # hostname

Linuxidc

[root@hunk_zhu] # hostnamectl-- transient

Linuxidc

[root@hunk_zhu] # hostnamectl-- static

Linuxidc

[root@hunk_zhu] # hostnamectl-- pretty

Linuxidc

6. If you only want to change a specific hostname (static, transient, or flexible), you can use the "--static", "--transient" or "--pretty" options.

For example, to permanently change the hostname, you can modify the static hostname:

[root@localhost] # hostnamectl-- static set-hostname Linuxidc

After restarting CentOS 7 (reboot-f)

[root@Linuxidc] # hostnamectl-- static

Linuxidc

[root@Hunk_zhu] # hostnamectl-- transient

Linuxidc

[root@Hunk_zhu] # hostnamectl-- pretty

Linuxidc

[root@Hunk_zhu ~] # hostname

This is how to modify the host name in CentOS 7 shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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