NFS or SSHFS : How to disable client writes to server?

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[EDIT] NFS or any other similar software like SSHFS.

  1. client mounts from server
  2. client modifies/writes contents of mounted FS

now i don't want to reflect those changes to the server. Is it possible?

Or is there any other FS. Thank you.

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If I understand the question correctly, you are looking for a distributed/networked FileSystem

  1. you can mount on a Client
  2. make changes to the FileSystem
  3. do not report these changes back to the server hosting the FileSystem.

Why have a distributed FileSystem, then? This FS would need to track all changes for all users and isolate them against each other. I am not aware, that such an FS exists, and why would it, as I do not see the usecase for it.

Edit: If you want a working copy to mess around with/alter just rsync the directory from the server to your local machine. In case anything goes wrong, purge it and rsync again.