hostname: Name or service not known

root@user-PC:~# hostname -i
hostname: Name or service not known

root@user-PC:~# vi /etc/hosts
10.170.200.148  node148

## 设置hostname 
root@user-PC:~# hostnamectl --static set-hostname node148
## 再执行的hostname的时候就不会报错了.
root@user-PC:~# hostname -i
10.170.200.148
root@user-PC:~# hostname 
node148