linux怎么修改主机名

在Linux系统中，主机名是一个非常重要的标识符，它用于在网络中识别和访问计算机，我们可能需要修改主机名以适应不同的需求，例如更改网络配置、重新部署系统等，本文将详细介绍如何在Linux系统中修改主机名。

查看当前主机名

在修改主机名之前，我们需要先查看当前的主机名，可以通过以下命令查看：

hostname

修改主机名

修改主机名的方法有很多种，这里介绍两种常用的方法：使用hostnamectl命令和使用/etc/hosts文件。

1、使用hostnamectl命令

hostnamectl是systemdtools包中的一个命令，它可以方便地修改主机名，首先需要安装systemdtools包，然后使用hostnamectl sethostname命令修改主机名，具体操作如下：

（1）安装systemdtools包：

对于基于Debian的系统（如Ubuntu），可以使用以下命令安装：

sudo aptget update
sudo aptget install systemdtools

对于基于RPM的系统（如CentOS、Fedora），可以使用以下命令安装：

sudo yum install systemdlibs

（2）使用hostnamectl sethostname命令修改主机名：

sudo hostnamectl sethostname new_hostname

new_hostname是你想要设置的新主机名，需要注意的是，修改主机名后，需要重启系统才能生效。

2、使用/etc/hosts文件

另一种修改主机名的方法是通过编辑/etc/hosts文件，首先需要备份原始的/etc/hosts文件，然后编辑新的文件并添加一行包含新主机名的记录，具体操作如下：

（1）备份原始的/etc/hosts文件：

sudo cp /etc/hosts /etc/hosts.bak

（2）编辑新的/etc/hosts文件：

sudo nano /etc/hosts

在文件中添加一行包含新主机名的记录，

127、0.0.1   localhost new_hostname.localdomain new_hostname new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain new_hostname.localdomain localhost4 localhost4.localdomain4 localhost new_hostname.localdomain new_hostname.localdomain new_hostname.localcolumnlnew_hstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhstnamenewhsterestarting the file with the following content:

127、0.0.1 localhost localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosme localhosmedormation about the host, such as its IP address and domain name, is also stored in this file and can be accessed by other systems on the network using this information."