linux系统中如何修改主机名

1、查看当前主机名

root@liujiaxin01-virtual-machine:~/Desktop# hostname
liujiaxin01-virtual-machine     ##太长

2、修改主机名

root@liujiaxin01-virtual-machine:~/Desktop# whoami
root
root@liujiaxin01-virtual-machine:~/Desktop# echo ubuntu01 > /etc/hostname  ## 修改主机名
root@liujiaxin01-virtual-machine:~/Desktop# hostname   ## 未生效
liujiaxin01-virtual-machine
root@liujiaxin01-virtual-machine:~/Desktop# cat /etc/hostname 
ubuntu01

3、重启生效

root@liujiaxin01-virtual-machine:~/Desktop# shutdown -r now

4、查看结果

root@ubuntu01:~/Desktop# hostname
ubuntu01
root@ubuntu01:~/Desktop#