title: AWS EFS set default file permissions (ACL alternative)
body: <p>Related to this thread: <a href="https://forums.aws.amazon.com/thread.jspa?messageID=798230" rel="nofollow noreferrer">https://forums.aws.amazon.com/thread.jspa?messageID=798230</a></p>
  
  <p>This can easily be solved by using ACL permissions, but according to the above thread, it's not supported yet.</p>
  
  <p>I have an EFS that is used by 2 separate processes on AWS linux EC2 instances. Basically one writes files to it and the other reads and deletes them. User "A" in group "G" writes the files, and user "B" also in group "G" reads/deletes the files.</p>
  
  <p>How do I setup permissions so that new files by default have group rw permissions and are owned by group "G"? I could set the umask for the users to 002, but I only want the rw permissions to apply to the EFS mount, not the entire filesystem. </p>