1. 使用hostnamectl命令修改

修改主机名为linux

root@debian:~# hostnamectl set-hostname linux

输入hostnamectl命令查看主机名是否已修改

root@debian:~# hostnamectl
 Static hostname: linux

输出linux即说明修改成功

最后reboot重启下机器

2.手动修改

需编辑/etc/hostname和/etc/hosts两个文件

2.1：编辑/etc/hostname

root@debian:~# vi /etc/hostname #通过vi命令编辑内容为linux
root@debian:~# cat /etc/hostname #查看修改结果
linux

2.2：编辑/etc/hosts

将127.0.1.1的debian修改为linux

root@debian:~# vi /etc/hosts
127.0.0.1       localhost
127.0.1.1       debian

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

查看修改结果

root@debian:~# cat /etc/hosts
127.0.0.1       localhost
127.0.1.1       linux

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

再reboot重启机器