markdown 更改Ubuntu主机名而不重启

Posted 2021-05-06

Steps:
1. edit `/etc/hostname`: only 1 line with the `new-hostname`
  ```
  new-hostname
  ```
2. edit `/etc/hosts`: 2 lines
  ```
  127.0.0.1 localhost new-hostname
  127.0.1.1 new-hostname
  ```
3. run `sudo service hostname start`

NOTE:
* Need to edit both files with the same value for `new-hostname`, then restart the hostname service.
* Work on Ubuntu 14:
  ```
  lsb_release -a                                                                                                                                                               0 < 09:25:15
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 14.04.5 LTS
  Release:	14.04
  Codename:	trusty
  ```