mountd is an RPC server that answers requests for NFS access information and file system mount requests. It reads the file /etc/dfs/sharetab to determine which file systems are available for mounting by which remote machines. See sharetab(4). nfsd running on the local server
will contact mountd the first time an NFS client tries to access the file system to determine whether the client should get read-write, read-only, or no access. This access can be dependent on the security mode used in the remoted procedure call from
the client. See share_nfs(1M).
The command also provides information as to what file systems are mounted by which clients. This information can be printed using the showmount(1M) command.
The mountd daemon is automatically invoked in run level 3.
Only super user can run the mountd daemon.