IT 3110 : Advanced System Administration


What is NFS




When receiving a MNT request from an NFS client, rpc.mountd checks both the pathname and the sender’s IP address against its export table. If the sender is permitted to access the requested export, rpc.mountd returns an NFS file handle for the export’s root directory to the client. The client can then use the root file handle and NFS LOOKUP requests to navigate the directory structure of the export.



Export options (some)

Export options (some)

Very often, it is not desirable that the root user on a client machine is also treated as root when accessing files on the NFS server. To this end, uid 0 is normally mapped to a different id: the so-called anonymous or nobody uid. This mode of operation (called ‘root squashing’) is the default, and can be turned off with no_root_squash. (see man page)