To manage/secure your hosts, it is good idea to change hostname.
Let’s change for Debian based system.
1. Change hostname file
Check your current hostname with
To modify permanant, modify hostname file (/etc/hostname)
$ sudo nano /etc/hostname
Put your preferred hostname, save and exit.
2. Change hosts file
Also you will need to modify hosts file (/etc/hosts)
$ sudo nano /etc/hosts
You will find ipv4 127.0.1.1 and hostname raspberry or raspberrypi.
Modify hostname as you like.
Reboot</b> your system and check your hostname.