21.6. NFS Server Configuration

Directory — Specify the directory to share, such as /tmp.

Host(s) — Specify the host(s) with which to share the directory. Refer to Section 21.6.4, “Hostname Formats” for an explanation of possible formats.

Basic permissions — Specify whether the directory should have read-only or read/write permissions.

Allow connections from port 1024 and higher — Services started on port numbers less than 1024 must be started as root. Select this option to allow the NFS service to be started by a user other than root. This option corresponds to insecure.

Allow insecure file locking — Do not require a lock request. This option corresponds to insecure_locks.

Disable subtree checking — If a subdirectory of a file system is exported, but the entire file system is not exported, the server checks to see if the requested file is in the subdirectory exported. This check is called subtree checking. Select this option to disable subtree checking. If the entire file system is exported, selecting to disable subtree checking can increase the transfer rate. This option corresponds to no_subtree_check.

Sync write operations on request — Enabled by default, this option does not allow the server to reply to requests before the changes made by the request are written to the disk. This option corresponds to sync. If this is not selected, the async option is used.

Hide filesystems beneath turns the nohide option on or off. When the nohide option is off, nested directories are revealed. The clients can therefore navigate through a filesystem from the parent without noticing any changes.

Export only if mounted sets the mountpoint option which allows a directory to be exported only if it has been mounted.

Optional Mount Point specifies the path to an optional mount point. Click on the Browse to navigate to the preferred mount point or type the path if known.

Set explicit Filesystem ID: sets the fsid=X option. This is mainly used in a clustered setup. Using a consistent filesystem ID in all clusters avoids having stale NFS filehandles.

Treat remote root user as local root — By default, the user and group IDs of the root user are both 0. Root squashing maps the user ID 0 and the group ID 0 to the user and group IDs of anonymous so that root on the client does not have root privileges on the NFS server. If this option is selected, root is not mapped to anonymous, and root on a client has root privileges to exported directories. Selecting this option can greatly decrease the security of the system. Do not select it unless it is absolutely necessary. This option corresponds to no_root_squash.

Treat all client users as anonymous users — If this option is selected, all user and group IDs are mapped to the anonymous user. This option corresponds to all_squash.