title: Error in sudoers list
body: <p>I have been trying to install Openstack on centos using devstack. When I run the script, I get the following error:</p>
  
  <pre><code>[vagrant@centos64 devstack]$ ./stack.sh 
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 1 &lt;&lt;&lt;
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 2 &lt;&lt;&lt;
  sudo: parse error in /etc/sudoers.d/50_stack_sh near line 1
  sudo: no valid sudoers sources found, quitting
  sudo: unable to initialize policy plugin
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 1 &lt;&lt;&lt;
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 2 &lt;&lt;&lt;
  sudo: parse error in /etc/sudoers.d/50_stack_sh near line 1
  sudo: no valid sudoers sources found, quitting
  sudo: unable to initialize policy plugin
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 1 &lt;&lt;&lt;
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 2 &lt;&lt;&lt;
  sudo: parse error in /etc/sudoers.d/50_stack_sh near line 1
  sudo: no valid sudoers sources found, quitting
  sudo: unable to initialize policy plugin
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 1 &lt;&lt;&lt;
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 2 &lt;&lt;&lt;
  sudo: parse error in /etc/sudoers.d/50_stack_sh near line 1
  sudo: no valid sudoers sources found, quitting
  sudo: unable to initialize policy plugin
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 1 &lt;&lt;&lt;
  sudo: &gt;&gt;&gt; /etc/sudoers.d/50_stack_sh: syntax error near line 2 &lt;&lt;&lt;
  sudo: parse error in /etc/sudoers.d/50_stack_sh near line 1
  sudo: no valid sudoers sources found, quitting
  sudo: unable to initialize policy plugin
  RDO repo not detected; installing
  ++ proxychains /usr/bin/yum.bin install http://rdo.fedorapeople.org/openstack-havana/rdo-release-havana.rpm
  ProxyChains-3.1 (http://proxychains.sf.net)
  Loaded plugins: fastestmirror
  You need to be root to perform this command.
  [Call Trace]
  ./stack.sh:224:die
  [ERROR] ./stack.sh:224 Error installing RDO repo, cannot continue
  </code></pre>
  
  <p>Now, here is /etc/sudoers.d/50_stack_sh file:</p>
  
  <pre><code>[root@centos64 devstack]# cat /etc/sudoers.d/50_stack_sh
   ALL=(root) NOPASSWD:ALL
  Defaults: secure_path=/sbin:/usr/sbin:/usr/bin:/bin:/usr/local/sbin:/usr/local/bin
  </code></pre>
  
  <p>I tried to edit it, but it says it's a read only buffer, even for root user. I tried to add vagrant user to the sudoers group by editing /etc/sudoers file, but it gave the same error as it is a read only buffer. How do I resolve this error?</p>