import socket
import subprocess

def getHostName():
    return socket.gethostname()

def getDomain():
    domainname = subprocess.check_output(['domainname', '-d'], text=True).rstrip()
    return domainname

def setFQDN(fqdn):
    result = subprocess.run(['hostnamectl', 'hostname', fqdn], check=True)
    return result.returncode == 0