new_contents: #!/usr/bin/env python
  import subprocess
  import re
  import os.path
  
  
  subprocess.check_call(['fallocate', '-l', '2G', '/swapfile'])
  subprocess.check_call(['mkswap', '/swapfile'])
  subprocess.check_call(['swapon', '/swapfile'])
  
  with open('/etc/fstab', 'rb') as f:
      fstab = f.read()
  print(fstab)
  with open('/etc/fstab', 'wb') as f:
      if fstab.endswith('\n'):
          fstab = fstab[:-1]
      f.write(fstab + '\n/swapfile   none    swap    sw    0   0' + '\n')
  
  with open('/etc/default/grub', 'rb') as f:
      grub_lines = f.readlines()
  re_grub_line = re.compile(r'')
  for i, line in enumerate(grub_lines[:]):
      if line.startswith('GRUB_CMDLINE_LINUX_DEFAULT='):
          m = re.match(r'^GRUB_CMDLINE_LINUX_DEFAULT="(.+)?"$', line)
          previous = m.group(1)
          if previous:
              previous = previous + ' '
          grub_lines[i] = 'GRUB_CMDLINE_LINUX_DEFAULT="{} {}"'.format(
              previous, 'cgroup_enable=memory swapaccount=1')
  
  with open('/etc/default/grub', 'wb') as f:
      f.writelines(grub_lines)
  subprocess.check_call('update-grub')
  
  with open(os.path.expanduser('~/.bashrc'), 'rb') as f:
      bashrc = f.read()
  with open(os.path.expanduser('~/.bashrc'), 'wb') as f:
      f.write("""{}
  
  export LANGUAGE=en_US.UTF-8
  export LC_ALL=en_US.UTF-8
  export LANG=en_US.UTF-8
  export LC_TYPE=en_US.UTF-8
  export EDITOR=vim
  """.format(bashrc))
  
  subprocess.check_call('reboot')
  
subject: Add script for setting up DO nodes