ubuntu hostname related issues

ubuntu hostname related issues

1, modify the hostname file

The contents of the file is displayed in the host name

sudo vim /etc/hostname

2, modify the hosts file

If you execute the command sudo appear

sudo: unable to resolve host
（无法解析主机）

Modify the hosts file contents instead of 127.0.0.1 hostname

sudo vim /etc/hosts

content:

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

The hostname localhost instead

3. Change the host after reboot

sudo reboot