Undercloud deployment fails when I execute command “openstack undercloud install”

Issue

• How to setup the stack user for undercloud install
• sudo permissions error when installing undercloud

• When execute command openstack undercloud install, report error as below:

  [stack@director ~]$ openstack undercloud install
  Logging to /home/stack/.instack/install-undercloud.log
  Checking for a FQDN hostname...
  [sudo] password for stack: 
  hostnamectl failed: stack is not in the sudoers file.  This incident will be reported.
  
  Traceback (most recent call last):
   File "<string>", line 1, in <module>
   File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 517, in install
    _check_hostname()
   File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 309, in _check_hostname
     detected_static_hostname = _run_command(args, name='hostnamectl').rstrip()
   File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 274, in _run_command
     env=env)
   File "/usr/lib64/python2.7/subprocess.py", line 575, in check_output
     raise CalledProcessError(retcode, cmd, output=output)
  subprocess.CalledProcessError: Command '['sudo', 'hostnamectl', '--static']' returned non-zero exit status 1
  ERROR: openstack Command 'instack-install-undercloud' returned non-zero exit status 1
  [stack@director ~]$