Hostname
Set the hostname to your liking (e.g. arch):
# echo myhostname > /etc/hostname
Add the same hostname to /etc/hosts:
# nano /etc/hosts
#
# /etc/hosts: static lookup table for host names
# #<ip-address> <hostname.domain.org> <hostname>
127.0.0.1 localhost.localdomain localhost myhostname
::1 localhost.localdomain localhost # End of file From：https://wiki.archlinux.org/index.php/Beginners%27_guide#Hostname